What's up with this endgame?

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Ovyron
Posts: 4556
Joined: Tue Jul 03, 2007 4:30 am

What's up with this endgame?

Post by Ovyron »

I just lost my first ICCF game since 2015, and I still don't know what happened.

At the end of 2017 I reached this endgame:

[d]8/3b2k1/1p3pp1/3p1p2/3P1P2/P3P3/5KP1/5B2 b - -

I analyzed it thoroughly and concluded it was an easy draw, as I couldn't find any progress for white. There were positions where Stockfish showed 0.00 up to depth 60. There were positions where Stockfish wouldn't show any progress up to depth 80 o_O

Note that my opponent had what I believed were more advantageous positions before, and he abandoned them for this endgame, which makes me believe he knew it was winning, which means this position is a white to move and mate in N.

I guess my analysis was done with engines that are now very updated, but I'd still like to know what's going on.

Full Pgn:

[pgn]1. d4 d5 2. Bf4 c5 3. c3 Nf6 4. e3 e6 5. Nd2 Nc6 6. Ngf3 Nh5 7. Bg5 f6 8. Bh4 g6 9. Be2 Ng7 10. Bg3 cxd4 11. cxd4 Nf5 12. O-O Kf7 13. a3 h5 14. Nh4 Nxg3 15. hxg3 Kg7 16. f4 Bd7 17. Nb3 b6 18. Bd3 Ne7 19. Rc1 Be8 20. g4 Rc8 21. Qf3 hxg4 22. Qxg4 Rh6 23. Nd2 Bd7 24. Qg3 Qe8 25. Ndf3 Nf5 26. Nxf5+ exf5 27. Rxc8 Qxc8 28. Qe1 Bd6 29. Kf2 b5 30. Qa5 Qb7 31. Rc1 Rh8 32. Bf1 Qb6 33. Qxb6 axb6 34. Ne1 b4 35. axb4 Ra8 36. Rc3 Ra1 37. Ra3 Rxe1 38. Kxe1 Bxb4+ 39. Kf2 Bxa3 40. bxa3 Ba4 41. Ke1 Kf7 42. Kd2 Ke7 43. Kc3 Kd6 44. Bd3 Kc7 45. Kb4 Bd1 46. Kb5 Bg4 47. Ka6 Bd1 48. Bb5 Bc2 49. Be8 Bd3+ 50. Ka7 g5 51. g3 Be2 52. Ba4 Bd3 53. Bb3 gxf4 54. exf4 Be4 55. Ba4 Bf3 56. Ka6 Be2+ 57. Bb5 Bg4 58. Bd3 Bh3 59. Kb5 Kb7 60. a4 Kc7 61. a5 bxa5 62. Kxa5 Kc6 63. Bb5+ Kc7 64. Ka6 Bg2 65. Be8 Bf1+ 66. Ka5 Bd3 67. Bg6 Bc2 68. Kb5 Kd6 69. Bh5 Bd3+ 70. Kb6 Bb1 71. Kb7 Be4 72. Kc8 Ke7 73. Kc7 Bd3 74. Kc6 Ke6 75. Be8 Bb1 76. Kc5 Be4 77. Bb5 Bh1 78. Ba6 Be4 79. Bb7 Kd7 80. Bxd5 Bc2 81. Bf7 Bd1 82. Bc4 Bf3 83. Bd3 Be4 84. Kc4 {Black Resigns. 1-0} [/pgn]
Your beliefs create your reality, so be careful what you wish for.
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Uri Blass
Posts: 10267
Joined: Thu Mar 09, 2006 12:37 am
Location: Tel-Aviv Israel

Re: What's up with this endgame?

Post by Uri Blass »

stockfish of today with contempt 0 can show some advantage for white with my old computer.

[d]8/3b2k1/1p3pp1/3p1p2/3P1P2/P3P3/5KP1/5B2 b - - 0 40

Stockfish_19071415_x64_modern:
1/1 00:00 38 19k -0.09 40. ... Kf7
2/2 00:00 90 45k +0.10 40. ... Kf7 41.Be2
3/3 00:00 164 82k -0.13 40. ... Kf7 41.Bd3 Ke6
4/4 00:00 337 169k 0.00 40. ... Kf7 41.Kf3 Ke6 42.Bd3
5/5 00:00 627 314k -0.24 40. ... Kf7 41.Kf3 Ke6 42.Bd3 Kd6
6/6 00:00 852 426k -0.02 40. ... Kf7 41.Kf3 Ke6 42.Be2 Kd6
7/8 00:00 4k 1,225k -0.18 40. ... Kf7 41.Bd3 Ke6 42.g3 g5 43.Bc2 gxf4
8/8 00:00 5k 1,305k -0.04 40. ... Kf7 41.Be2 Ke7 42.Bd3 Ke6 43.Kg3 Bc6
9/9 00:00 8k 1,502k -0.13 40. ... Kf7 41.Bd3 Ke6 42.Kf3 Kd6 43.Ke2 Ke6 44.Kd2 Kd6
10/12 00:00 14k 1,991k -0.13 40. ... Kf7 41.Bd3 Ke6 42.Ke2 Kd6 43.Kd2 Ke6 44.Kc3 Kd6 45.Kb4 Ke6 46.g3
11/15 00:00 29k 2,602k -0.32 40. ... Kf7 41.Ke1 Ke6 42.Kd2 Kd6 43.Bd3 Kc6 44.Kc2 Kd6 45.Kb3 Bc6 46.Kc3
12/15 00:00 44k 2,447k -0.48 40. ... Kf7 41.Ke1 Ke6 42.Kd2 Kd6 43.Be2 Kc6 44.Kc3 Kc7 45.Kb4 Bc6 46.Bb5 Bxb5
13/20 00:00 98k 2,568k -0.76 40. ... Kf7 41.Ke1 Ke6 42.Kd2 Kd6 43.Kc3 Kc6 44.Kb4 Kd6 45.Bd3 Bc6 46.Be2 Kc7
14/18 00:00 99k 2,606k -0.41 40. ... Kf7 41.Ke1 Ke6 42.Kd2 Kd6 43.Kc3 Kc6 44.Kb4 Kd6 45.Be2 Bc6 46.Bd3 Kc7 47.Kb3 Bd7
15/19 00:00 108k 2,624k -0.31 40. ... Kf7 41.Ke1 Ke6 42.Kd2 Kd6 43.Kc3 Kc6 44.Kb4 Kd6 45.Bb5 Bc6 46.Bd3 Kc7 47.Be2 Kd7 48.Bf1 Kc7 49.Bd3 Kb8
16/28 00:00 122k 2,713k -0.23 40. ... Kf7 41.Ke1 Ke6 42.Kd2 Kd6 43.Kc3 Kc6 44.Kb4 Kd6 45.Bb5 Bc6 46.Be2 Kd7 47.Kc3 Kd6 48.Bf1 Kc7 49.Bd3 Bd7
17/28 00:00 135k 2,700k -0.01 40. ... Kf7 41.Ke1 Ke6 42.Kd2 Kd6 43.Kc3 Kc6 44.Kb4 Kd6 45.Bd3 Kc7 46.Be2 Bc6 47.Bf1 Kb8 48.Bd3 Kc7 49.Be2 Kd6
18/23 00:00 146k 2,755k 0.00 40. ... Kf7 41.Ke1 Ke6 42.Kd2 Kd6 43.Kc3 Kc6 44.Kb4 Kd6
19/12 00:00 148k 2,799k 0.00 40. ... Kf7 41.Ke1 Ke6 42.Kd2 Kd6 43.Kc3 Kc6 44.Kb4 Kd6
20/14 00:00 153k 2,788k 0.00 40. ... Kf7 41.Ke1 Ke6 42.Kd2 Kd6 43.Kc3 Kc6 44.Kb4 Kd6
21/13 00:00 157k 2,800k 0.00 40. ... Kf7 41.Ke1 Ke6 42.Kd2 Kd6 43.Kc3 Kc6 44.Kb4 Kd6 45.Ba6 Bc6 46.Bf1
22/18 00:00 162k 2,844k 0.00 40. ... Kf7 41.Ke1 Ke6 42.Kd2 Kd6 43.Kc3 Kc6 44.Kb4 Kd6 45.Ba6 Bc6 46.Bd3 Kc7 47.Ba6
23/25 00:00 180k 2,860k 0.00 40. ... Kf7 41.Ke1 Ke6 42.Kd2 Kd6 43.Kc3 Kc6 44.Kb4 Kd6
24/34 00:00 338k 2,990k -0.53 40. ... Kf7 41.Ke1 Ke6 42.Kd2 Kd6 43.Kc3 Kc6 44.Kb4 Kd6 45.Be2 Kc7 46.a4 Kb7 47.a5 bxa5+ 48.Kxa5 Kc7 49.Bd1 Kd6 50.Kb6 Bc6 51.Bb3 Bd7 52.Bc2 Be8 53.Bd3 Bc6 54.Bb5 Bxb5 55.Kxb5 g5
25/38 00:00 1,127k 3,325k -0.76 40. ... Kf7 41.Ke1 Ke6 42.Kd2 Kd6 43.Kc3 Kc6 44.Kb4 Kc7 45.Ba6 Bc6 46.Be2 Bd7 47.Bf1 Be8 48.Bd3 Bf7 49.a4 Kd6 50.Kb5 Kc7 51.Ka6 Be6 52.a5 Bc8+ 53.Kb5 Bd7+ 54.Kb4 bxa5+ 55.Kxa5
26/32 00:00 1,143k 3,321k -0.76 40. ... Kf7 41.Ke1 Ke6 42.Kd2 Kd6 43.Kc3 Kc6 44.Kb4 Kc7 45.Ba6 Bc6 46.Be2 Bd7 47.Bf1 Be8 48.Bd3 Bf7 49.a4 Kd6 50.Kb5 Kc7 51.Ka6 Be6 52.a5 Bc8+ 53.Kb5 Bd7+ 54.Kb4 bxa5+ 55.Kxa5 Be8 56.Bb5
27/33 00:00 1,196k 3,341k -0.76 40. ... Kf7 41.Ke1 Ke6 42.Kd2 Kd6 43.Kc3 Kc6 44.Kb4 Kc7 45.Ba6 Bc6 46.Be2 Bd7 47.Bf1 Be8 48.Bd3 Bf7 49.a4 Kd6 50.Kb5 Kc7 51.Ka6 Be6 52.a5 Bc8+ 53.Kb5 Bd7+ 54.Kb4 bxa5+ 55.Kxa5 Be8 56.Bb5 Bf7
28/38 00:00 1,326k 3,399k -0.76 40. ... Kf7 41.Ke1 Ke6 42.Kd2 Kd6 43.Kc3 Kc6 44.Kb4 Kc7 45.Ba6 Bc6 46.Be2 Bd7 47.Bf1 Be8 48.Bd3 Bf7 49.a4 Kd6 50.Kb5 Kc7 51.Ka6 Be6 52.a5 Bc8+ 53.Kb5 Bd7+ 54.Kb4 bxa5+ 55.Kxa5 Be8 56.Bf1 g5 57.Be2 Bg6 58.Kb5 gxf4 59.exf4
29/45 00:00 1,492k 3,478k -0.73 40. ... Kf7 41.Ke1 Ba4 42.Kd2 Ke6 43.Kc3 Kd7 44.Bd3 Bd1 45.Kb4 Kc6 46.Bb5+ Kd6 47.Kc3 Kc7 48.Be8 g5 49.Bb5 Bh5 50.Bd3 Bg6 51.Kb4 Kd6 52.Kb5 Kc7 53.Ka6 Kc6 54.a4 Kc7 55.Kb5 Be8+ 56.Kb4 Bg6 57.a5 bxa5+ 58.Kxa5 Kc6
30/40 00:00 1,664k 3,495k -0.73 40. ... Kf7 41.Ke1 Ba4 42.Kd2 Ke6 43.Kc3 Kd7 44.Bd3 Bd1 45.Kb4 Kc6 46.Bb5+ Kd6 47.Kc3 Kc7 48.Be8 g5 49.Bb5 Bh5 50.Bd3 Bg6 51.Kb4 Kd6 52.a4 Kc7 53.a5 bxa5+ 54.Kxa5 Kc6 55.Be2 Bf7 56.Bb5+ Kc7 57.Bd3 Bg6 58.Kb5 Kd6 59.Be2 Be8+ 60.Kb6
31/43 00:00 1,860k 3,503k -0.76 40. ... Kf7 41.Ke1 Ba4 42.Kd2 Ke6 43.Kc3 Kd7 44.Bd3 Bd1 45.Bb5+ Ke6 46.Be8 g5 47.Bb5 Bh5 48.Bd3 Bg6 49.Kb4 Kd6 50.a4 Kc7 51.a5 bxa5+ 52.Kxa5 Kc6 53.Be2 Kc7 54.Kb5 Kd6 55.Kb6 Be8 56.Ka5 Bd7 57.Kb4 Be8 58.Bb5 Bg6 59.Bd3
32/40 00:00 2,023k 3,555k -0.76 40. ... Kf7 41.Ke1 Ba4 42.Kd2 Ke6 43.Kc3 Kd7 44.Bd3 Bd1 45.Bb5+ Ke6 46.Be8 g5 47.Bb5 Bh5 48.Bd3 Bg6 49.Kb4 Kd6 50.a4 Kc7 51.a5 bxa5+ 52.Kxa5 Kc6 53.Be2 Kc7 54.Kb5 Kd6 55.Kb6 Be8 56.Ka5 Bd7 57.Kb4 Be8 58.Bb5 Bg6 59.Bd3 Kc6 60.Ka5
33/41 00:00 2,193k 3,606k -0.76 40. ... Kf7 41.Ke1 Ba4 42.Kd2 Ke6 43.Kc3 Kd7 44.Bd3 Bd1 45.Bb5+ Ke6 46.Be8 g5 47.Bb5 Bh5 48.Kb4 Kd6 49.Bd3 Bg6 50.Kb5 Kc7 51.Ka6 Kc6 52.Bb5+ Kc7 53.a4 Bf7 54.a5 bxa5 55.Kxa5 Bg6 56.Kb4 Kb6 57.Bd3 Kc6 58.Ka5 Kc7 59.Kb5 gxf4 60.exf4
34/46 00:00 2,506k 3,685k -0.76 40. ... Kf7 41.Ke1 Ba4 42.Kd2 Ke6 43.Kc3 Kd7 44.Bd3 Bd1 45.Bb5+ Ke6 46.Be8 g5 47.Bb5 Bh5 48.Kb4 Kd6 49.Bd3 Bg6 50.Kb5 Kc7 51.Ka6 Kc6 52.Bb5+ Kc7 53.a4 Bf7 54.a5 bxa5 55.Kxa5 Bg6 56.Bd3 Kc6 57.Be2 Kc7 58.Kb5 Kd6 59.Kb6 Be8 60.Ka5 Kc7 61.Bd3 Bg6 62.Kb5 gxf4 63.exf4
35/44 00:00 2,905k 3,792k -0.76 40. ... Kf7 41.Ke1 Ba4 42.Kd2 Ke6 43.Kc3 Kd7 44.Bd3 Bd1 45.Bb5+ Ke6 46.Be8 g5 47.Kd2 Bg4 48.Bb5 Bh5 49.Kc3 Bg6 50.Kb4 Kd6 51.a4 Kc7 52.Bd3 Kb7 53.a5 bxa5+ 54.Kxa5 Kc6 55.Be2 Kc7 56.Kb5 Kd6 57.Kb6 Be8 58.Ka5 Bg6 59.Kb5
36/44 00:00 3,261k 3,864k -0.76 40. ... Kf7 41.Ke1 Ba4 42.Kd2 Ke6 43.Kc3 Kd7 44.Bd3 Bd1 45.Bb5+ Ke6 46.Be8 g5 47.Kd2 Bg4 48.Bb5 Bh5 49.Kc3 Kd6 50.Kb4 Kc7 51.a4 Bg6 52.Bd3 Kd6 53.Kc3 Kc6 54.Bb5+ Kc7 55.Kb4 Kd6 56.Bd3 Kc7 57.a5 bxa5+ 58.Kxa5 Kc6 59.Be2 Kc7 60.Kb5 gxf4 61.exf4
37/42 00:00 3,919k 3,979k -0.76 40. ... Kf7 41.Ke1 Ba4 42.Kd2 Ke6 43.Kc3 Kd7 44.Bd3 Bd1 45.Bb5+ Ke6 46.Be8 g5 47.Kd2 Bg4 48.Bb5 Bh5 49.Kc3 Kd6 50.Kb4 Kc7 51.a4 Bg6 52.Bd3 Kd6 53.Kc3 Kc6 54.Bb5+ Kc7 55.Kb4 Kd6 56.Bd3 Kc7 57.a5 bxa5+ 58.Kxa5 Kc6 59.Be2 Kc7 60.Kb5 gxf4 61.exf4
38/49 00:01 4,926k 4,101k -0.76 40. ... Kf7 41.Ke1 Ba4 42.Kd2 Ke6 43.Kc3 Kd7 44.Bd3 Bd1 45.Bb5+ Ke6 46.Be8 g5 47.Kd2 Bg4 48.Bb5 Bh5 49.Kc3 Kd6 50.Kb4 Kc7 51.a4 Bg6 52.Bd3 Kd6 53.Be2 Kc6 54.Kc3 Kb7 55.Bb5 Kc7 56.Kb4 Kd6 57.Bd3 Kc7 58.a5 bxa5+ 59.Kxa5 Kc6 60.Be2 Kc7
39/62 00:02 10,038k 4,462k -0.13 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke6 43.Ke2 Kd6 44.g4 Bd7 45.g5 fxg5 46.fxg5 Kc7 47.Kd2 Kc6 48.Kc3 b5 49.Kb4 Kb6 50.Be2 Be8 51.Kc3 Ka5 52.Bf3 Bc6 53.Bd1 Kb6 54.Kb4 Bd7 55.Bb3 Bc6 56.Bc2 Bd7 57.Kc3 Bc6 58.Bd1 Bd7 59.Bb3 Bc6 60.Kb4 Bb7 61.a4 bxa4 62.Bxa4
40/62 00:02 13,249k 4,533k 0.00 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke6 43.Ke2 Bc6 44.Kd2 Kd6 45.Kc3 Ba4 46.Kb4 Bd1 47.Kb5 Kc7 48.a4 Kd6 49.a5 bxa5 50.Kxa5 Bb3 51.Kb5 Bd1 52.Kb4 Kc6 53.Bb5+ Kb6 54.Be8 g5 55.Kc3 Be2 56.Bf7 Kc6 57.Bg6 gxf4 58.exf4 Bf1 59.g3 Bh3 60.Bh7 Kd6 61.Kd3 Ke7 62.Bg6 Kd6 63.Ke3 Ke7 64.Kf2 Bg4
41/53 00:03 14,399k 4,554k 0.00 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke6 43.Ke2 Bc6 44.Kd2 Kd6 45.Kc3 Ba4 46.Kb4 Bd1 47.Kb5 Kc7 48.a4 Kd6 49.a5 bxa5 50.Kxa5 Bb3 51.Kb5 Bd1
42/57 00:03 15,993k 4,587k 0.00 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke6 43.Ke2 Bc6 44.Kd2 Kd6 45.Kc3 Ba4 46.Kb4 Bd1 47.Kb5 Kc7 48.a4 Kd6 49.a5 bxa5 50.Kxa5 Bb3 51.Kb5 Bd1 52.Kb4 Kc6 53.Ka5 Kd6 54.Kb6
43/28 00:03 17,131k 4,589k 0.00 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke6 43.Ke2 Bc6 44.Kd2 Kd6 45.Kc3 Ba4 46.Kb4 Bd1 47.Kb5 Kc7 48.a4 Kd6 49.a5 bxa5 50.Kxa5 Bb3 51.Kb5 Bd1
44/32 00:04 19,307k 4,587k 0.00 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke6 43.Ke2 Bc6 44.Kd2 Kd6 45.Kc3 Ba4 46.Kb4 Bd1 47.Kb5 Kc7 48.a4 Kd6 49.a5 bxa5 50.Kxa5 Bb3 51.Kb5 Bd1 52.Kb6 Ba4 53.Ka6 Bd1 54.Kb5 Bb3 55.Ka5 Bd1
45/32 00:04 21,301k 4,606k 0.00 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke6 43.Ke2 Bc6 44.Kd2 Kd6 45.Kc3 Ba4 46.Kb4 Bd1 47.Kb5 Kc7 48.a4 Kd6 49.a5 bxa5 50.Kxa5 Bb3 51.Kb5 Bd1
46/32 00:05 23,608k 4,613k 0.00 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke6 43.Ke2 Bc6 44.Kd2 Kd6 45.Kc3 Ba4 46.Kb4 Bd1 47.Kb5 Kc7 48.a4 Kd6 49.a5 bxa5 50.Kxa5 Bb3 51.Kb5 Bd1 52.Kb6 Ba4 53.Ka6 Bd1 54.Kb5 Bb3 55.Ka5 Bd1
47/32 00:05 26,550k 4,630k 0.00 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke6 43.Ke2 Bc6 44.Kd2 Kd6 45.Kc3 Ba4 46.Kb4 Bd1 47.Kb5 Kc7 48.a4 Kd6 49.a5 bxa5 50.Kxa5 Bb3 51.Kb5 Bd1 52.Kb6 Ba4 53.Ka6 Bd1 54.Kb5 Bb3 55.Ka5 Bd1
48/32 00:06 29,873k 4,625k 0.00 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke6 43.Ke2 Bc6 44.Kd2 Kd6 45.Kc3 Ba4 46.Kb4 Bd1 47.Kb5 Kc7 48.a4 Kd6 49.a5 bxa5 50.Kxa5 Bb3 51.Kb5 Bd1
49/32 00:07 33,634k 4,632k 0.00 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke6 43.Ke2 Bc6 44.Kd2 Kd6 45.Kc3 Ba4 46.Kb4 Bd1 47.Kb5 Kc7 48.a4 Kd6 49.a5 bxa5 50.Kxa5 Bb3 51.Kb5 Bd1
50/26 00:08 39,258k 4,646k 0.00 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke6 43.Ke2 Bc6 44.Kd2 Kd6 45.Kc3 Ba4 46.Kb4 Bd1 47.Kb5 Kc7 48.a4 Kd6 49.a5 bxa5 50.Kxa5 Bb3 51.Kb5 Bd1
51/56 00:09 46,351k 4,680k 0.00 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke6 43.Ke2 Bc6 44.Kd2 Kd6 45.Kc3 Ba4 46.Kb4 Bd1 47.Kb5 Kc7 48.a4 Kd6 49.a5 bxa5 50.Kxa5 Bb3 51.Kb5 Bd1
52/72 00:11 54,184k 4,681k 0.00 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke6 43.Ke2 Bc6 44.Kd2 Kd6 45.Kc3 Ba4 46.Kb4 Bd1 47.Kb5 Kc7 48.a4 Kd6 49.a5 bxa5 50.Kxa5 Bb3 51.Kb5 Bd1 52.Kb4 Kc6 53.Ka5 Kd6 54.Kb4
53/62 00:12 60,744k 4,696k 0.00 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke6 43.Ke2 Bc6 44.Kd2 Kd6 45.Kc3 Ba4 46.Kb4 Bd1 47.Kb5 Kc7 48.a4 Kd6 49.a5 bxa5 50.Kxa5 Bb3 51.Kb5 Bd1 52.Kb4 Kc6 53.Ka5 Kd6 54.Kb4
54/52 00:15 75,005k 4,690k 0.00 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke6 43.Ke2 Bc6 44.Kd2 Kd6 45.Kc3 Ba4 46.Kb4 Bd1 47.Kb5 Kc7 48.a4 Kd6 49.a5 bxa5 50.Kxa5 Bb3 51.Kb5 Bd1 52.Kb4 Kc6 53.Bb5+ Kb6 54.Be8 g5 55.Kc3 gxf4 56.exf4 Be2 57.Bf7 Kc6 58.Kb4 Bd3 59.Ka5 Be4 60.g3 Bd3 61.Bg6 Be4 62.Be8+ Kc7 63.Kb5 Kd6 64.Kb6 Bc2 65.Bb5 Be4
55/58 00:18 86,216k 4,692k 0.00 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke6 43.Ke2 Bc6 44.Kd2 Kd6 45.Kc3 Ba4 46.Kb4 Bd1 47.Kb5 Kc7 48.a4 Kd6 49.a5 bxa5 50.Kxa5 Bb3 51.Kb5 Bd1 52.Kb4 Kc6 53.Bb5+ Kb6 54.Be8 g5 55.Kc3 gxf4 56.exf4 Be2 57.Bf7 Kc6 58.Kb4 Bd3 59.Ka5 Be4 60.g3 Bd3 61.Bg6 Be4 62.Be8+ Kc7 63.Kb5 Kd6 64.Kb6 Bc2 65.Bb5 Be4
56/58 00:20 94,710k 4,705k 0.00 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke6 43.Ke2 Bc6 44.Kd2 Kd6 45.Kc3 Ba4 46.Kb4 Bd1 47.Kb5 Kc7 48.a4 Kd6 49.a5 bxa5 50.Kxa5 Bb3 51.Kb5 Bd1
57/62 00:24 116,360k 4,727k 0.00 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke6 43.Ke2 Bc6 44.Kd2 Kd6 45.Kc3 Ba4 46.Kb4 Bd1 47.Kb5 Kc7 48.a4 Kd6 49.a5 bxa5 50.Kxa5 Bb3 51.Kb5 Bd1
58/56 00:26 127,487k 4,741k 0.00 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke6 43.Ke2 Bc6 44.Kd2 Kd6 45.Kc3 Ba4 46.Kb4 Bd1 47.Kb5 Kc7 48.a4 Kd6 49.a5 bxa5 50.Kxa5 Bb3 51.Kb5 Bd1
59/44 00:31 150,349k 4,742k 0.00 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke6 43.Ke2 Bc6 44.Kd2 Kd6 45.Kc3 Ba4 46.Kb4 Bd1 47.Kb5 Kc7 48.a4 Kd6 49.a5 bxa5 50.Kxa5 Bb3 51.Kb5 Bd1
60/44 00:38 181,800k 4,759k 0.00 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke6 43.Ke2 Bc6 44.Kd2 Kd6 45.Kc3 Ba4 46.Kb4 Bd1 47.Kb5 Kc7 48.a4 Kd6 49.a5 bxa5 50.Kxa5 Bb3 51.Kb5 Bd1
61/75 00:47 222,407k 4,639k 0.00 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke6 43.Ke2 Bc6 44.Kd2 Kd6 45.Kc3 Ba4 46.Kb4 Bd1 47.Kb5 Kc7 48.a4 Kd6 49.a5 bxa5 50.Kxa5 Bb3 51.Kb5 Bd1
62/86 00:59 270,915k 4,539k 0.00 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke6 43.Ke2 Bc6 44.Kd2 Kd6 45.Kc3 Ba4 46.Kb4 Bd1 47.Kb5 Kc7 48.a4 Kd6 49.a5 bxa5 50.Kxa5 Bb3 51.Kb5 Bd1 52.Kb4 Kc6 53.Bb5+ Kb6 54.Be8 g5 55.g3 Bc2 56.Bb5 Be4 57.Ba4 Bd3 58.Bb3 Kc6 59.Bd1 Be4 60.Ba4+ Kd6 61.Bb5 Bb1 62.Be2 Be4 63.Kb5 Bc2 64.Bf3 Bd3+ 65.Kb4 Bb1 66.Kc3 Kc6 67.Bg2 Kd6 68.Kb4
63/60 01:06 302,064k 4,556k 0.00 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke6 43.Ke2 Bc6 44.Kd2 Kd6 45.Kc3 Ba4 46.Kb4 Bd1 47.Kb5 Kc7 48.a4 Kd6 49.a5 bxa5 50.Kxa5 Bb3 51.Kb5 Bd1 52.Kb4 Kc6 53.Bb5+ Kb6 54.Be8 g5 55.Bf7 Kc6 56.Kc3 Be2 57.Be8+ Kc7 58.Kb4 Kb6 59.Bf7 gxf4 60.exf4 Kc6 61.Bg6 Bf1 62.g3 Bd3 63.Be8+ Kb6 64.Ba4 Be4 65.Bb5 Bc2 66.Bd7 Be4
64/140 01:16 351,310k 4,596k 0.00 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke6 43.Ke2 Bc6 44.Kd2 Kd6 45.Kc3 Ba4 46.Kb4 Bd1 47.Kb5 Kc7 48.a4 Kd6 49.a5 bxa5 50.Kxa5 Bb3 51.Kb5 Bd1 52.Kb4 Kc6 53.Bb5+ Kb6 54.Be8 g5 55.Bf7 Kc6 56.Kc3 Be2 57.Be8+ Kc7 58.Kb4 Kb6 59.Bf7 gxf4 60.exf4 Kc6 61.Bg6 Bf1 62.g3 Bd3 63.Be8+ Kb6 64.Ba4 Be4 65.Bb5 Bc2 66.Bd7 Be4 67.Kc3 Ka6 68.Be8 Bf3 69.Ba4 Kb6 70.Bd7 Be4 71.Be8 Ka5 72.Bf7 Ka4 73.Be6 Kb5 74.Bd7+
65/58 01:41 472,445k 4,645k 0.00 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke6 43.Ke2 Bc6 44.Kd2 Kd6 45.Kc3 Ba4 46.Kb4 Bd1 47.Kb5 Kc7 48.a4 Kd6 49.a5 bxa5 50.Kxa5 Bb3 51.Kb5 Bd1 52.Kb4 Kc6 53.Bb5+ Kb6 54.Be8 g5 55.Bf7 Kc6 56.Kc3 Be2 57.Be8+ Kc7 58.Ba4 gxf4 59.exf4 Bf1 60.Kb4 Kb6 61.g3 Bd3 62.Bd7 Bc2 63.Bb5 Bb1 64.Be2 Be4 65.Bf1 Kc6 66.Bb5+ Kb6 67.Be2 Bb1 68.Kb3 Be4
66/62 01:51 517,310k 4,647k 0.00 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke6 43.Ke2 Bc6 44.Kd2 Kd6 45.Kc3 Ba4 46.Kb4 Bd1 47.Kb5 Kc7 48.a4 Kd6 49.a5 bxa5 50.Kxa5 Bb3 51.Kb5 Bd1 52.Kb4 Kc6 53.Bb5+ Kb6 54.Be8 g5 55.Bf7 Kc6 56.Kc3 Be2 57.Be8+ Kc7 58.Ba4 gxf4 59.exf4 Bf1 60.Kb4 Kb6 61.g3 Bd3 62.Bd7 Bc2 63.Bb5 Bb1 64.Be2 Be4 65.Bf1 Kc6 66.Bb5+ Kb6 67.Be2 Bb1 68.Bh5 Be4 69.Bg6 Bc2 70.Kc3 Be4
67/81 02:02 568,062k 4,648k 0.00 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke6 43.Ke2 Bc6 44.Kd2 Kd6 45.Kc3 Ba4 46.Kb4 Bd1 47.Kb5 Kc7 48.a4 Kd6 49.a5 bxa5 50.Kxa5 Bb3 51.Kb5 Bd1 52.Kb4 Kc6 53.Bb5+ Kb6 54.Be8 g5 55.Bf7 Kc6 56.Kc3 Be2 57.Be8+ Kc7 58.Ba4 gxf4 59.exf4 Bf1 60.Kb4 Kb6 61.g3 Bd3 62.Bd7 Bc2 63.Bb5 Bb1 64.Be2 Be4 65.Bf1 Kc6 66.Bb5+ Kb6
68/66 02:11 610,236k 4,656k 0.00 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke6 43.Ke2 Bc6 44.Kd2 Kd6 45.Kc3 Ba4 46.Kb4 Bd1 47.Kb5 Kc7 48.a4 Kd6 49.a5 bxa5 50.Kxa5 Bb3 51.Kb5 Bd1 52.Kb4 Kc6 53.Bb5+ Kb6 54.Be8 g5 55.Bf7 Kc6 56.Kc3 Be2 57.Be8+ Kc7 58.Ba4 gxf4 59.exf4 Bf1 60.Kb4 Kb6 61.g3 Bd3 62.Bd7 Bc2 63.Bb5 Bb1 64.Be2 Be4 65.Bf1 Kc6 66.Bb5+ Kb6 67.Be2 Bb1 68.Bh5 Be4
69/56 02:25 680,497k 4,665k 0.00 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke6 43.Ke2 Bc6 44.Kd2 Kd6 45.Kc3 Ba4 46.Kb4 Bd1 47.Kb5 Kc7 48.a4 Kd6 49.a5 bxa5 50.Kxa5 Bb3 51.Kb5 Bd1 52.Kb4 Kc6 53.Bb5+ Kb6 54.Be8 g5 55.Bf7 Kc6 56.Kc3 Be2 57.Be8+ Kc7 58.Ba4 gxf4 59.exf4 Bf1 60.Kb4 Kb6 61.g3 Bd3 62.Bd7 Bc2 63.Bb5 Bb1 64.Be2 Be4 65.Bf1 Kc6 66.Bb5+ Kb6
70/61 02:52 808,026k 4,685k 0.00 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke6 43.Ke2 Bc6 44.Kd2 Kd6 45.Kc3 Ba4 46.Kb4 Bd1 47.Kb5 Kc7 48.a4 Kd6 49.a5 bxa5 50.Kxa5 Bb3 51.Kb5 Bd1 52.Kb4 Kc6 53.Bb5+ Kb6 54.Be8 g5 55.Bf7 Kc6 56.Kc3 Be2 57.Be8+ Kc7 58.Ba4 gxf4 59.exf4 Bf1 60.Kb4 Kb6 61.g3 Bd3 62.Bd7 Bc2 63.Bb5 Bb1 64.Be2 Be4 65.Bf1 Kc6 66.Bb5+ Kb6
71/66 03:10 894,017k 4,687k 0.00 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke6 43.Ke2 Bc6 44.Kd2 Kd6 45.Kc3 Ba4 46.Kb4 Bd1 47.Kb5 Kc7 48.a4 Kd6 49.a5 bxa5 50.Kxa5 Bb3 51.Kb5 Bd1 52.Kb4 Kc6 53.Bb5+ Kb6 54.Be8 g5 55.Bf7 Kc6 56.Kc3 Be2 57.Be8+ Kc7 58.Ba4 gxf4 59.exf4 Bf1 60.Kb4 Kb6 61.g3 Bd3 62.Bd7 Bc2 63.Bb5 Bb1 64.Be2 Be4 65.Bf1 Kc6 66.Bb5+ Kb6 67.Be8 Bd3 68.Kc3 Be4
72/95 04:34 1,290,195k 4,695k 0.00 40. ... Kf7 41.Ke1 Ke7 42.Kd2 Kd6 43.Kc3 Ba4 44.Be2 Kc6 45.Kb4 Bc2 46.Bb5+ Kc7 47.Be8 g5 48.Bb5 Be4 49.g3 Kd6 50.a4 Kc7 51.Be2 Kd6 52.Kb5 Kc7 53.a5 bxa5 54.Kxa5 Kc6 55.Bb5+ Kc7 56.Kb4 Kd6 57.fxg5 fxg5 58.Ba4 Bd3 59.Bb3 Kc6 60.Ba4+
73/36- 04:47 1,346,628k 4,690k -0.09 40. ... Kf7 41.Ke1
73/36- 05:08 1,444,316k 4,677k -0.19 40. ... Kf7 41.Ke1
73/36- 05:26 1,530,630k 4,685k -0.33 40. ... Kf7 41.Ke1
73/118- 07:09 1,985,978k 4,623k -0.53 40. ... Kf7 41.Ke1
73/118- 08:02 2,226,684k 4,611k -0.79 40. ... Kf7 41.Ke1
73/146 11:53 3,248,956k 4,554k -0.79 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke7 43.Kd2 Kd6 44.Kc3 Kc7 45.Kb4 Bd1 46.Kb5 Kb7 47.a4 g5 48.Bxf5 Be2+ 49.Kb4 Kc6 50.Be6 Kd6 51.Bf7 Bf1 52.g3 Be2 53.Be8 Bf1 54.Bb5 Bh3 55.Bd3 Bg2 56.Kb5 Kc7 57.Be2 Be4 58.Kb4 Bf5 59.Bh5 Be4 60.Be8 Kd8 61.Bb5 Ke7 62.Bc6 Kd6 63.Kb5 Kc7 64.Be8 Bd3+ 65.Kb4 Kd6 66.Bh5 Bf1 67.Kc3 Bg2 68.Bd1 Be4 69.Be2 Bf5 70.Bd3 Bg4 71.Bc2 Bf3 72.Kd2 Bg4 73.Ke1 Bf3 74.Bd3 Bg4 75.Be2 Bf5 76.Bf3 Bd7 77.Bd1 Bf5 78.Kd2 Be4 79.Bc2 Bf3 80.Kc3 Be2 81.Bb3 Bf3 82.fxg5 fxg5 83.Bc2
74/92 13:35 3,722,410k 4,565k -0.79 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke7 43.Kd2 Kd6 44.Kc3 Kc7 45.Kb4 Bd1 46.Kb5 Kb7 47.a4 g5 48.Bxf5 Be2+ 49.Kb4 Kc6 50.Be6 Kd6 51.Bf7 Kc6 52.g3 Kd6 53.Be8 Bf1 54.Bb5 Bh3 55.Bd3 Bg2 56.Kb5 Kc7 57.Be2 Be4 58.Kb4 Bf5 59.Bh5 Be4 60.Be8 Kd8 61.Bb5 Ke7 62.Bc6 Kd6 63.Kb5 Kc7 64.Be8 Bd3+ 65.Kb4 Kd6 66.Bh5 Kc6 67.Bd1 Be4 68.Kc3 Bf5 69.Bc2 Bg4 70.Kb4 Bf3 71.Bd3 Kd6 72.Kb5 Kc7 73.Bf5 Be2+ 74.Kb4 Kc6 75.Bg6 Kd6 76.Bc2 Bf1 77.Bb3 Be2 78.Kc3 Bf3 79.Kd2 Bg4 80.Bc2 Bf3 81.Bf5 Kc7 82.Kc3 Bd1 83.Bc2 Bf3 84.Bd3 Kd6 85.fxg5 fxg5 86.Kb4
75/118 14:16 3,903,782k 4,560k -0.79 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke7 43.Kd2 Kd6 44.Kc3 Kc7 45.Kb4 Bd1 46.Kb5 Kb7 47.a4 g5 48.Bxf5 Be2+ 49.Kb4 Kc6 50.Be6 Kd6 51.Bf7 Kc6 52.g3 Kd6 53.Be8 Bf1 54.Bb5 Bh3 55.Bd3 Bg2 56.Kb5 Kc7 57.Be2 Be4 58.Kb4 Bf5 59.Bh5 Be4 60.Be8 Kd8 61.Bb5 Ke7 62.Bc6 Kd6 63.Kb5 Kc7 64.Be8 Bd3+ 65.Kb4 Kd6 66.Bh5 Bf5 67.Kb5 Kc7 68.Bf3 Bd3+ 69.Kb4 Kc6 70.Kc3 Bf1 71.Bd1 Bh3 72.Bb3 Bf5 73.Kb4 Be4 74.Bd1 Bf5 75.Kb3 Kd6 76.Bc2 Bg4 77.Bd3 Bd1+ 78.Kb4 Kc6 79.Bb5+ Kd6 80.Kc3 Bg4 81.Bd3 Bf3 82.Bf5 Bd1 83.Bc2 Bf3 84.Bb3 Be4 85.Bd1 Kc6 86.Bc2 Bf3 87.Bg6 Bg4 88.Be8+ Kc7 89.Kb4 Bd1 90.fxg5 fxg5 91.Bf7
76/102 15:00 4,101,315k 4,552k -0.79 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke7 43.Kd2 Kd6 44.Kc3 Kc7 45.Kb4 Bd1 46.Kb5 Kb7 47.a4 g5 48.Bxf5 Be2+ 49.Kb4 Kc6 50.Be6 Kd6 51.Bf7 Kc6 52.g3 Kd6 53.Be8 Bf1 54.Bb5 Bh3 55.Bd3 Bg2 56.Kb5 Kc7 57.Be2 Be4 58.Kb4 Bf5 59.Bh5 Be4 60.Be8 Kd8 61.Bb5 Ke7 62.Bc6 Kd6 63.Kb5 Kc7 64.Be8 Bd3+ 65.Kb4 Kd6 66.Bh5 Be4 67.Be2 Bf5 68.Kb5 Kc7 69.Bd1 Bd3+ 70.Kb4 Kc6 71.Kc3 Bf5 72.Bc2 Bg4 73.Kb4 Be2 74.Bb3 Kd6 75.Kc3 Bf3 76.Kd2 Bg2 77.Bc2 Bf3 78.Bd3 Bg4 79.Kc3 Bf3 80.Bf5 Bd1 81.Bc2 Bf3 82.Bb3 Be2 83.Kd2 Bg4 84.Bd1 Bh3 85.Be2 Bf5 86.Bb5 Be4 87.Kc3 Kc7 88.Be2 Kc6 89.g4 Kc7 90.fxg5
77/126 16:29 4,470,257k 4,516k -0.79 40. ... Kf7 41.Ke1 Ba4 42.Bd3 Ke7 43.Kd2 Kd6 44.Kc3 Kc7 45.Kb4 Bd1 46.Kb5 Kb7 47.a4 g5 48.Bxf5 Be2+ 49.Kb4 Kc6 50.Be6 Kd6 51.Bf7 Kc6 52.g3 Kd6 53.Be8 Bf1 54.Bb5 Bh3 55.Bd3 Bg2 56.Kb5 Kc7 57.Be2 Be4 58.Kb4 Bf5 59.Bh5 Be4 60.Be8 Kd8 61.Bb5 Ke7 62.Bc6 Kd6 63.Kb5 Kc7 64.Be8 Bd3+ 65.Kb4 Kd6 66.Bh5 Bb1 67.Kb5 Kc7 68.Bf3 Bd3+ 69.Kb4 Kc6 70.Kc3 Ba6 71.Bd1 Bf1 72.Bc2 Bh3 73.Bd3 Bg4 74.Kb4 Bf3 75.Bb5+ Kd6 76.Bf1 Be4 77.Kb5 Kc7 78.Be2 Bf5 79.Bd1 Bd3+ 80.Kb4 Kc6 81.Bf3 Bc2 82.Bg4 Bd3 83.Kc3 Be4 84.Bh5 Kc7 85.Be8 Kd6 86.Bb5 Bf5 87.Bd3 Bg4 88.Kd2 Kd7 89.Be2 Bh3 90.Bd1 Kd6 91.Bc2 Bg4 92.Ke1 Bf3 93.Bd3 Bg4 94.Be2 Bf5 95.Kd2 Be4 96.Kc3 Kc6 97.Bb5+ Kd6 98.Bd3 Bf3 99.Bc2 Be2 100.fxg5 fxg5 101.Bd3
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User avatar
Eelco de Groot
Posts: 4561
Joined: Sun Mar 12, 2006 2:40 am
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Re: What's up with this endgame?

Post by Eelco de Groot »

Stockfish end of 2017 can't have been all that bad :roll: What did it miss? At move 50 Kaissa with no tablebases thinks this about drawish:

[d]4B3/K1k5/1p3pp1/3p1p2/3P1P2/P2bP3/6P1/8 b - -

Engine: Kaissa IV NoContempt (one thread, version 154B, 512 MB)
by T. Romstad, M. Costalba, J. Kiiski, G. Linscott

38/58 0:01 +0.13 50...g5 51.a4 Be4 52.g3 Bf3 53.Ka6 Be2+
54.Bb5 Bd1 55.a5 bxa5 56.Kxa5 Bh5
57.Kb4 Kd6 58.Bd3 Bg6 59.Kb5 Bh7
60.Kb6 Bg6 61.Bc2 Bh7 62.Ba4 Bg6
63.Bd1 Be8 (3.798.658) 2261
.
.
.
79/99 11:50 +0.95 50...g5 51.a4 Bf1 52.g3 Bd3 53.Bb5 Bc2
54.Ka6 Bb3 55.a5 bxa5 56.Kxa5 Bc2
57.Be8 Bd3 58.Ba4 Kb7 59.Bb5 Bc2
60.Bf1 Kc6 61.Be2 Be4 62.Bb5+ Kb7
63.Ba6+ Kc6 (1.862.480.236) 2622

80/90 12:29 +0.95 50...g5 51.a4 Bf1 52.g3 Bd3 53.Bb5 Bc2
54.Ka6 Bb3 55.a5 bxa5 56.Kxa5 Bc2
57.Be8 Bd3 58.Ba4 Kb7 59.Bb5 Bc2
60.Bf1 Kc6 61.Be2 Be4 62.Bb5+ Kb7
63.Ba6+ Kc6 (1.962.285.723) 2619

81/137 13:37 +0.95 50...g5 51.a4 Bf1 52.g3 Bd3 53.Bb5 Bc2
54.Ka6 Bb3 55.a5 bxa5 56.Kxa5 Bc2
57.Be8 Bd3 58.Ba4 Kb7 59.Bb5 Bc2
60.Bf1 Kc6 61.Be2 Be4 62.Bb5+ Kb7
63.Ba6+ Kc6 (2.139.813.044) 2618

82/95 14:54 +0.95 50...g5 51.a4 Bf1 52.g3 Bd3 53.Bb5 Bc2
54.Ka6 Bb3 55.a5 bxa5 56.Kxa5 Bc2
57.Be8 Bd3 58.Ba4 Kb7 59.Bb5 Bc2
60.Bf1 Kc6 61.Be2 Be4 62.Bb5+ Kb7
63.Ba6+ Kc6 (2.344.289.428) 2621

83/111 16:37 +0.95 50...g5 51.a4 Bf1 52.g3 Bd3 53.Bb5 Bc2
54.Ka6 Bb3 55.a5 bxa5 56.Kxa5 Bc2
57.Be8 Bd3 58.Ba4 Kb7 59.Bb5 Bc2
60.Bf1 Kc6 61.Be2 Be4 62.Bb5+ Kb7
63.Ba6+ Kc6 (2.599.504.720) 2605

But I also checked at move 60:

[d]8/1k6/1p3p2/1K1p1p2/P2P1P2/3B2Pb/8/8 b - -

Code: Select all

Engine: Kaissa IV NoContempt (512 MB)
by T. Romstad, M. Costalba, J. Kiiski, G. Linscott

37/56  0:01   +2.40    60...Kc7 61.a5 bxa5 62.Kxa5 Kc6 
                       63.Bb1 Bg4 64.Bc2 Bf3 65.Ba4+ Kc7 
                       66.Kb5 Kd6 67.Kb6 Bh5 68.Bc2 Bg6 
                       69.Bd3 Bh5 70.Bxf5 Bf3 71.Ka5 Bh1 
                       72.Ka4 Bf3 73.Kb4 Bg2 (4.835.561) 2862 

38/50  0:02   +2.42    60...Kc7 61.a5 bxa5 62.Kxa5 Kc6 
                       63.Bb1 Bg4 64.Bc2 Be2 65.Bxf5 Bf1 
                       66.Kb4 Kb6 67.Be6 Bg2 68.g4 Bh3 
                       69.Bf5 Kc6 70.Ka5 Kc7 71.Kb5 Kd6 
                       72.Kb6 Bg2 73.Ka5 Ke7 (5.921.558) 2853 

39/55  0:02   +2.48    60...Kc7 61.a5 bxa5 62.Kxa5 Kc6 
                       63.Bb1 Bg4 64.Bc2 Be2 65.Bxf5 Bf1 
                       66.Kb4 Kb6 67.Be6 Bg2 68.g4 Bh3 
                       69.Bf5 Kc6 70.Ka5 Kc7 71.Kb5 Kd6 
                       72.Kb6 Bg2 73.Ka5 Bh3 (7.799.001) 2820 

40/54  0:03   +2.48    60...Kc7 61.a5 bxa5 62.Kxa5 Kc6 
                       63.Bb1 Bg4 64.Bc2 Be2 65.Bxf5 Bf1 
                       66.Kb4 Kb6 67.Be6 Bg2 68.g4 Bh3 
                       69.Bf5 Kc6 70.Ka5 Kc7 71.Kb5 Kd6 
                       72.Kb6 Bg2 73.Ka5 Bh3 (8.496.713) 2812 

41/60  0:03   +2.39++  60...Kc7 (9.214.204) 2808 

41/60  0:03   +2.48    60...Kc7 61.a5 bxa5 62.Bc2 Bg2 
                       63.Bxf5 Be4 64.g4 Bg2 65.Kxa5 Bh3 
                       66.Kb5 Kd6 67.Kb6 Bg2 68.Ka5 Ke7 
                       69.Kb5 Bh1 70.Kc5 Bg2 71.g5 fxg5 
                       72.fxg5 Bf3 73.Bd3 Kf7 (9.779.345) 2807 

42/59  0:04   +2.58--  60...Kc7 61.a5 (11.964.173) 2821 

42/59  0:04   +2.67--  60...Kc7 61.a5 (13.059.154) 2832 

42/59  0:04   +2.67    60...Kc7 61.a5 bxa5 62.Bc2 Bg2 
                       63.Bxf5 Be4 64.g4 Bg2 65.Kxa5 Bh3 
                       66.Kb5 Kd6 67.Kb6 Bg2 68.Ka5 Ke7 
                       69.Kb5 Bh1 70.Kc5 Bg2 71.g5 fxg5 
                       72.fxg5 Bf3 73.Bd3 Kf7 (13.476.016) 2825 

43/44  0:05   +2.76--  60...Kc7 61.a5 (14.716.522) 2845 

43/60  0:05   +2.86--  60...Kc7 61.a5 (16.131.969) 2842 

43/60  0:06   +3.00--  60...Kc7 61.a5 (17.441.631) 2848 

43/60  0:06   +2.88++  60...Kc7 (19.063.396) 2858 

43/60  0:06   +3.00    60...Kc7 61.a5 bxa5 62.Kxa5 Kc6 
                       63.Bc2 Bf1 64.Bxf5 Bg2 65.Ka4 Bf1 
                       66.Kb4 Kb6 67.Be6 Kc6 68.Ka5 Kd6 
                       69.Bf5 Kc6 70.g4 Bh3 71.Ka4 Kb6 
                       72.Kb4 Kc6 73.Ka5 Kc7 (19.505.531) 2857 

44/62  0:07   +3.09--  60...Kc7 61.a5 (21.114.109) 2860 

44/62  0:07   +3.10    60...Kc7 61.a5 bxa5 62.Kxa5 Kc6 
                       63.Bc2 Bf1 64.Bxf5 Bg2 65.Ka4 Bf1 
                       66.Kb4 Kb6 67.Bd7 Bg2 68.g4 Bh3 
                       69.Bf5 Kc6 70.Ka5 Kc7 71.Kb5 Kd6 
                       72.Kb6 Bg2 73.Ka5 Ke7 (22.632.657) 2878 

45/56  0:08   +3.19--  60...Kc7 61.a5 (24.338.526) 2887 

45/58  0:08   +3.19    60...Kc7 61.a5 bxa5 62.Kxa5 Kc6 
                       63.Bc2 Bf1 64.Bxf5 Bg2 65.Ka4 Bf1 
                       66.Kb4 Kb6 67.Bd7 Bg2 68.g4 Bh3 
                       69.Bf5 Kc6 70.Ka4 Kc7 71.Kb5 Kd6 
                       72.Kb6 Bg2 73.Ka5 Ke7 (25.700.479) 2914 

46/62  0:09   +3.20    60...Kc7 61.a5 bxa5 62.Kxa5 Kc6 
                       63.Bc2 Bf1 64.Bxf5 Bg2 65.Ka4 Bf1 
                       66.Kb4 Kb6 67.Bd7 Bg2 68.g4 Bh3 
                       69.Bf5 Kc6 70.Ka5 Kc7 71.Kb5 Kd6 
                       72.Kb6 Bg2 73.Ka5 Bh3 (28.139.754) 2932 

47/60  0:10   +3.20    60...Kc7 61.a5 bxa5 62.Kxa5 Kc6 
                       63.Bc2 Bf1 64.Bxf5 Bg2 65.Ka4 Bf1 
                       66.Kb4 Kb6 67.Bd7 Bg2 68.g4 Bh3 
                       69.Bf5 Kc6 70.Ka5 Kc7 71.Kb5 Kd6 
                       72.Kb6 Bg2 73.Ka5 Bh3 (30.101.425) 2945 

48/66  0:11   +3.29    60...Kc7 61.a5 bxa5 62.Kxa5 Kc6 
                       63.Bc2 Bf1 64.Bxf5 Bg2 65.Ka4 Bf1 
                       66.Kb4 Kb6 67.Bd7 Bg2 68.g4 Bh3 
                       69.Bf5 Kc6 70.Ka5 Kd6 71.Kb5 Bf1+ 
                       72.Kb4 Bh3 73.Kc3 Ke7 (33.641.499) 2955 

49/65  0:12   +3.29    60...Kc7 61.a5 bxa5 62.Kxa5 Kc6 
                       63.Bc2 Bf1 64.Bxf5 Bg2 65.Ka4 Bf1 
                       66.Kb4 Kb6 67.Bd7 Bg2 68.g4 Bh3 
                       69.Bf5 Kc6 70.Ka5 Kc7 71.Kb5 Kd6 
                       72.Kb6 Bg2 73.Ka5 Bh3 (37.542.427) 3003 

50/68  0:13   +3.38--  60...Kc7 61.a5 (42.125.159) 3044 

50/68  0:14   +3.47--  60...Kc7 61.a5 (45.933.468) 3064 

50/68  0:15   +3.47    60...Kc7 61.a5 bxa5 62.Kxa5 Kc6 
                       63.Bc2 Bf1 64.Bxf5 Bg2 65.Ka4 Bf1 
                       66.Kb4 Kb6 67.Bd7 Bg2 68.g4 Bh3 
                       69.Bf5 Kc6 70.Ka5 Kc7 71.Kb5 Kd6 
                       72.Kb6 Bg2 73.Ka5 Bh3 (48.388.008) 3065 

51/59  0:17   +3.57--  60...Kc7 61.a5 (53.421.629) 3074 

51/62  0:18   +3.57    60...Kc7 61.a5 bxa5 62.Kxa5 Kc6 
                       63.Bc2 Bf1 64.Bxf5 Bg2 65.Ka4 Bf1 
                       66.Kb4 Kb6 67.Bd7 Bg2 68.g4 Bh3 
                       69.Bf5 Kc6 70.Kc3 Kb6 71.Kd2 Kc6 
                       72.Ke3 Kd6 73.Ke2 Ke7 (57.312.989) 3097 

52/56  0:21   +3.66--  60...Kc7 61.a5 (65.597.559) 3089 

52/56  0:24   +3.76--  60...Kc7 61.a5 (75.134.744) 3114 

52/63  0:27   +3.90--  60...Kc7 61.a5 (85.677.548) 3128 

52/71  0:31   +4.09--  60...Kc7 61.a5 (98.563.836) 3112 

52/90  0:37   +4.36--  60...Kc7 61.a5 (117.458.074) 3114 

52/90  0:44   +4.72--  60...Kc7 61.a5 (138.071.003) 3129 

52/90  0:46   +4.72    60...Kc7 61.a5 bxa5 62.Kxa5 Kc6 
                       63.Bc2 Bf1 64.Bxf5 Bg2 65.Ka4 Bf1 
                       66.Kb4 Kb6 67.Bd7 Bg2 68.g4 Bh3 
                       69.Be6 Kc6 70.Bf5 Kd6 71.Ka4 Ke7 
                       72.Kb5 Kd6 73.Kb4 Kc6 (147.989.316) 3160 

53/76  0:52   +4.81--  60...Kc7 61.a5 (166.849.090) 3164 

53/88  0:58   +4.91--  60...Kc7 61.a5 (184.970.970) 3188 

53/88  1:02   +5.05--  60...Kc7 61.a5 (200.052.647) 3196 

53/88  1:09   +5.24--  60...Kc7 61.a5 (222.192.440) 3218 

53/88  1:17   +5.51--  60...Kc7 61.a5 (247.928.842) 3206 

53/88  1:27   +5.87--  60...Kc7 61.a5 (282.920.196) 3227 

53/88  1:39   +6.34--  60...Kc7 61.a5 (323.256.259) 3252 

53/88  1:59   +6.95--  60...Kc7 61.a5 (395.843.452) 3308 

53/88  2:29   +7.73--  60...Kc7 61.a5 (496.413.876) 3329 

53/88  2:36   +7.73    60...Kc7 61.a5 bxa5 62.Kxa5 Kc6 
                       63.Bc2 Bg4 64.Ba4+ Kd6 65.Kb6 Bh5 
                       66.Kb7 Ke7 67.Kc8 Be2 68.Bd7 Bf3 
                       69.Kc7 Be4 70.Kc6 Bc2 71.Bc8 Bd3 
                       72.Kc7 Be4 73.Ba6 Bf3 (524.115.107) 3342 

54/82  2:50   +7.73    60...Kc7 61.a5 bxa5 62.Kxa5 Kc6 
                       63.Bc2 Bg4 64.Ba4+ Kd6 65.Kb6 Bh5 
                       66.Kb7 Ke7 67.Kc8 Be2 68.Bd7 Bf3 
                       69.Kc7 Be4 70.Kc6 Bc2 71.Bc8 Bd3 
                       72.Kc7 Be4 73.Ba6 Bf3 (571.800.343) 3363 

55/77  2:56   +7.73    60...Kc7 61.a5 bxa5 62.Kxa5 Kc6 
                       63.Bc2 Bg4 64.Ba4+ Kd6 65.Kb6 Bh5 
                       66.Kb7 Ke7 67.Kc8 Be2 68.Bd7 Bf3 
                       69.Kc7 Be4 70.Kc6 Bc2 71.Bc8 Bd3 
                       72.Kc7 Be4 73.Ba6 Bf3 (595.704.755) 3368 

56/82  3:02   +7.73    60...Kc7 61.a5 bxa5 62.Kxa5 Kc6 
                       63.Bc2 Bg4 64.Ba4+ Kd6 65.Kb6 Bh5 
                       66.Kb7 Ke7 67.Kc8 Be2 68.Bd7 Bf3 
                       69.Kc7 Be4 70.Kc6 Bc2 71.Bc8 Bd3 
                       72.Kc7 Be4 73.Bd7 Bc2 (619.058.935) 3386 

57/82  3:16   +7.73    60...Kc7 61.a5 bxa5 62.Kxa5 Kc6 
                       63.Bc2 Bg4 64.Ba4+ Kd6 65.Kb6 Bh5 
                       66.Kb7 Ke7 67.Kc8 Be2 68.Bd7 Bf3 
                       69.Kc7 Be4 70.Kc6 Bc2 71.Bc8 Bd3 
                       72.Kc7 Be4 73.Bd7 Bc2 (663.696.361) 3382 

58/81  3:33   +7.73    60...Kc7 61.a5 bxa5 62.Kxa5 Kc6 
                       63.Bc2 Bg4 64.Ba4+ Kd6 65.Kb6 Bh5 
                       66.Kb7 Ke7 67.Kc8 Be2 68.Bd7 Bf3 
                       69.Kc7 Bg4 70.Bc8 Bh3 71.Ba6 Bg4 
                       72.Bd3 Bh3 73.Kc6 Ke6 (720.093.545) 3379 

59/83  3:47   +7.73    60...Kc7 61.a5 bxa5 62.Kxa5 Kc6 
                       63.Bc2 Bg4 64.Ba4+ Kd6 65.Kb6 Bh5 
                       66.Kb7 Ke7 67.Kc8 Be2 68.Bd7 Bf3 
                       69.Kc7 Bg4 70.Bc8 Bh3 71.Ba6 Bg4 
                       72.Bd3 Bh3 73.Kc6 Ke6 (766.565.869) 3374 

60/92  4:06   +7.73    60...Kc7 61.a5 bxa5 62.Kxa5 Kc6 
                       63.Bc2 Bg4 64.Ba4+ Kd6 65.Kb6 Bh5 
                       66.Kb7 Ke7 67.Kc8 Be2 68.Bd7 Bf3 
                       69.Kc7 Bg4 70.Bc8 Bh3 71.Ba6 Bg4 
                       72.Bd3 Bh3 73.Kc6 Ke6 (831.479.831) 3376 

61/96  4:14   +7.73    60...Kc7 61.a5 bxa5 62.Kxa5 Kc6 
                       63.Bc2 Bg4 64.Ba4+ Kd6 65.Kb6 Bh5 
                       66.Kb7 Ke7 67.Kc8 Be2 68.Bd7 Bf3 
                       69.Kc7 Bg4 70.Bc8 Bh3 71.Ba6 Bg4 
                       72.Bd3 Bh3 73.Kc6 Ke6 (859.901.147) 3384 

62/88  4:44   +7.73    60...Kc7 61.a5 bxa5 62.Kxa5 Kc6 
                       63.Bc2 Bg4 64.Ba4+ Kd6 65.Kb6 Bh5 
                       66.Kb7 Ke7 67.Kc8 Be2 68.Bd7 Bf3 
                       69.Kc7 Bg4 70.Bc8 Bh3 71.Ba6 Bg4 
                       72.Bd3 Bh3 73.Kc6 Ke6 (963.014.899) 3384 

63/88  5:07   +7.73    60...Kc7 61.a5 bxa5 62.Kxa5 Kc6 
                       63.Bc2 Bg4 64.Ba4+ Kd6 65.Kb6 Bh5 
                       66.Kb7 Ke7 67.Kc8 Be2 68.Bd7 Bf3 
                       69.Kc7 Bg4 70.Bc8 Bh3 71.Ba6 Bg4 
                       72.Bd3 Bh3 73.Kc6 Ke6 (1.037.360.528) 3374 

64/100 5:20   +7.73    60...Kc7 61.a5 bxa5 62.Kxa5 Kc6 
                       63.Bc2 Bg4 64.Ba4+ Kd6 65.Kb6 Bh5 
                       66.Kb7 Ke7 67.Kc8 Be2 68.Bd7 Bf3 
                       69.Kc7 Bg4 70.Bc8 Bh3 71.Ba6 Bg4 
                       72.Bd3 Bh3 73.Kc6 Ke6 (1.081.230.684) 3373 

65/90  5:50   +7.73    60...Kc7 61.a5 bxa5 62.Kxa5 Kc6 
                       63.Bc2 Bg4 64.Ba4+ Kd6 65.Kb6 Bh5 
                       66.Kb7 Ke7 67.Kc8 Be2 68.Bd7 Bf3 
                       69.Kc7 Bg4 70.Bc6 Bf3 71.Bb5 Be4 
                       72.Kc8 Bh1 73.Bc6 Kd6 (1.181.600.516) 3373 

66/93  6:28   +7.73    60...Kc7 61.a5 bxa5 62.Kxa5 Kc6 
                       63.Bc2 Bg4 64.Ba4+ Kd6 65.Kb6 Bh5 
                       66.Kb7 Ke7 67.Kc8 Be2 68.Bd7 Bf3 
                       69.Kc7 Bg4 70.Bc6 Bf3 71.Ba4 Bh1 
                       72.Kc6 Be4 73.Bb5 Bh1 (1.316.617.228) 3389 

67/105 7:09   +7.73    60...Kc7 61.a5 bxa5 62.Kxa5 Kc6 
                       63.Bc2 Bg4 64.Ba4+ Kd6 65.Kb6 Bh5 
                       66.Kb7 Ke7 67.Kc8 Be2 68.Bd7 Bf3 
                       69.Kc7 Bg4 70.Bc6 Bf3 71.Ba4 Bh1 
                       72.Kc6 Be4 73.Bb5 Bh1 (1.454.574.187) 3388
I guess it is some Zugzwang issue?
Debugging is twice as hard as writing the code in the first
place. Therefore, if you write the code as cleverly as possible, you
are, by definition, not smart enough to debug it.
-- Brian W. Kernighan
Top
Uri Blass
Posts: 10267
Joined: Thu Mar 09, 2006 12:37 am
Location: Tel-Aviv Israel

Re: What's up with this endgame?

Post by Uri Blass »

I do not like
29...b5
stockfish with contempt 0 suggest 29...a5 with 0.00 evaluation.

[d]2q5/p2b2k1/1p1b1ppr/3p1p2/3P1P2/P2BPN2/1P3KP1/4QR2 b - - 3 29

Stockfish_19071415_x64_modern:
1/1 00:00 155 78k -0.15 29. ... Qe8
2/2 00:00 383 192k +0.15 29. ... Qe8 30.b4
3/3 00:00 623 312k +0.06 29. ... Rh8 30.b4 Qe8
4/4 00:00 872 436k +0.43 29. ... Rh8 30.Be2 Qe8 31.b4
5/5 00:00 3k 1,009k -0.18 29. ... Qh8 30.b4 b5 31.Be2 Qb8
6/6 00:00 5k 1,068k -0.15 29. ... Qh8 30.b4 Kf8 31.Qd1 Kf7 32.Rg1
7/7 00:00 7k 1,150k -0.10 29. ... Qh8 30.Be2 Kf8 31.Qd1 Kf7 32.Qc1 Qd8
8/9 00:00 10k 1,463k -0.31 29. ... Qh8 30.Qd1 g5 31.fxg5 fxg5 32.Nxg5 Qe8 33.Qb3
9/11 00:00 14k 1,608k +0.04 29. ... Qh8 30.Qd1 g5 31.Qb3 Qe8 32.Qxd5
10/11 00:00 34k 1,800k +0.31 29. ... g5 30.Rh1 Rxh1 31.Qxh1 gxf4 32.exf4 Bxf4 33.g3 Bc1
11/11 00:00 48k 1,858k +0.17 29. ... g5 30.Rh1 Rxh1 31.Qxh1 gxf4 32.exf4 Bxf4 33.g3 Qc1 34.Qxc1 Bxc1
12/19 00:00 118k 1,998k +0.01 29. ... g5 30.g3 Qh8 31.Rg1 a5 32.Rg2 Rh3 33.Qg1 a4 34.Rh2 Rxh2+ 35.Qxh2 Qxh2+ 36.Nxh2 gxf4 37.gxf4
13/26 00:00 201k 1,878k 0.00 29. ... g5 30.g3 Qh8 31.Rg1 Rh5 32.Bf1 Rh6
14/22 00:00 291k 1,956k -0.26 29. ... g5 30.g3 Qh8 31.Rg1 Rh5 32.Bf1 a5 33.Bg2 Bb5 34.Rh1 a4 35.Rxh5 Qxh5 36.Qd1 Qg6 37.Qc2 gxf4
15/27 00:00 773k 2,535k -0.18 29. ... Qe8 30.Qd1 Ba4 31.Qb1 Rh8 32.Rc1 Bb5 33.Qc2 Bxd3 34.Qxd3 Qe6 35.Rc6 Qd7 36.Rc2 Rh1
16/20 00:00 1,574k 2,732k +0.22 29. ... a5 30.Qe2 Qc6 31.Qd2 Rh8 32.Rc1 Qb7 33.g3 Qa8 34.Qc2 b5 35.Nh4 a4 36.Bf1 b4
17/34 00:00 1,836k 2,782k 0.00 29. ... a5 30.Rh1 Rxh1 31.Qxh1 b5 32.Nh4 g5 33.fxg5 fxg5 34.Nf3 g4 35.Ne5 Bxe5 36.dxe5 Qc7 37.e6 Bxe6 38.Qh4 Qe5 39.b4 axb4 40.axb4 Qb2+ 41.Kg3 Qe5+
18/37 00:00 2,149k 2,843k 0.00 29. ... a5 30.Rh1 Rxh1 31.Qxh1 b5 32.Nh4 g5 33.fxg5 fxg5 34.Nf3 g4 35.Ng5 Kg6 36.Qh4 Qd8 37.Qh7+ Kxg5 38.Qg7+ Kh5 39.Qh7+
19/21 00:00 2,306k 2,843k 0.00 29. ... a5 30.Rh1 Rxh1 31.Qxh1 b5 32.Nh4 g5 33.fxg5 fxg5 34.Nf3 g4 35.Ng5 Kg6 36.Qh4 Qd8 37.Qh7+ Kxg5 38.Qg7+ Kh5 39.Qh7+
20/23 00:00 2,437k 2,837k 0.00 29. ... a5 30.Rh1 Rxh1 31.Qxh1 b5 32.Nh4 g5 33.fxg5 fxg5 34.Nf3 g4 35.Ng5 Kg6 36.Qh4 Qd8 37.Qh7+ Kxg5 38.Qg7+ Kh5 39.Qh7+
21/21 00:00 2,741k 2,873k 0.00 29. ... a5 30.Rh1 Rxh1 31.Qxh1 b5 32.Nh4 g5 33.fxg5 fxg5 34.Nf3 g4 35.Ng5 Kg6 36.Qh4 Qd8 37.Qh7+ Kxg5 38.Qg7+ Kh5 39.Qh7+
22/39 00:01 3,460k 2,952k 0.00 29. ... a5 30.Rh1 Rxh1 31.Qxh1 b5 32.Nh4 g5 33.fxg5 fxg5 34.Nf3 g4 35.Nd2 Qe8 36.Qh4 Qe7 37.Qxe7+ Bxe7 38.Nb3 b4 39.axb4 axb4 40.Nc5 Bc8 41.Bc2 Kf6 42.g3 Bd6 43.Bb3 Be6 44.Nxe6 Kxe6 45.Bd1 Kf6
23/41 00:02 6,427k 3,108k +0.13 29. ... a5 30.Rh1 Rxh1 31.Qxh1 b5 32.g3 b4 33.axb4 Bxb4 34.Nh4 Be6 35.Qd1 Bf7 36.Bb5 Qb7 37.Ba4 Bd6 38.Qc2 Qb4 39.Nf3 Be6 40.Qb3 Qxb3 41.Bxb3 Kf8 42.Ba4
24/37 00:02 8,454k 3,146k +0.13 29. ... a5 30.Rh1 Rxh1 31.Qxh1 b5 32.g3 b4 33.axb4 Bxb4 34.Nh4 Be6 35.Qd1 Bf7 36.Be2 Be8 37.Nf3 Bd7 38.Ne1 Qh8 39.Nf3 Qe8 40.Nh4 Ba4 41.Qd3 Qe6 42.Qa6 Qxa6 43.Bxa6 Kf7
25/41- 00:03 9,599k 3,158k +0.03 29. ... a5 30.Rh1
25/41- 00:03 10,928k 3,161k -0.05 29. ... a5 30.Rh1
25/41 00:04 15,117k 3,193k 0.00 29. ... a5 30.Rh1 Rxh1 31.Qxh1 Ba4 32.Qf1 Bb3 33.Nd2 Ba4 34.Nb1 Bb3 35.Nd2
26/43 00:05 18,731k 3,217k 0.00 29. ... a5 30.Rh1 Rxh1 31.Qxh1 Ba4 32.Qf1 Qc6 33.Nh4 Qc7 34.Qb1 Bb3 35.Nxg6 Kxg6 36.Bxf5+ Kg7 37.Qh1 b5 38.Qh7+ Kf8 39.Qh8+ Kf7 40.g4 Qe7 41.Qh7+ Kf8 42.Qh8+
27/39 00:06 21,600k 3,233k 0.00 29. ... a5 30.Rh1 Rxh1 31.Qxh1 Ba4 32.Qf1 Qc6 33.Nh4 Qc7 34.Qb1 Bb3 35.Nf3 Qc6 36.Nd2 Ba4 37.Nf3
28/40- 00:07 23,042k 3,241k -0.09 29. ... a5 30.Rh1
28/40 00:08 26,835k 3,256k -0.11 29. ... a5 30.Rh1 Rxh1 31.Qxh1 Ba4 32.Qf1 Qc6 33.g3 Qc7 34.Nd2 Qc6 35.Qb1 Qc8 36.Qh1 Qc6 37.Qf1 b5 38.Qg1 b4 39.g4 Bc2 40.Qc1 Ba4 41.Qxc6 Bxc6 42.gxf5 bxa3 43.bxa3 g5 44.Nb3 gxf4 45.Nxa5 fxe3+ 46.Kxe3 Ba4 47.Nb7 Bxa3 48.Nc5 Be8 49.Kf2
29/42+ 00:09 30,668k 3,274k -0.02 29. ... a5
29/42 00:09 31,153k 3,273k 0.00 29. ... a5 30.Rh1 Rxh1 31.Qxh1 Ba4 32.g3 Qc6 33.Qf1 Qc7 34.Nd2 Qc6
30/42- 00:10 34,595k 3,243k -0.09 29. ... a5 30.Rh1
30/42+ 00:12 39,124k 3,246k 0.00 29. ... a5
30/42 00:12 40,778k 3,254k 0.00 29. ... a5 30.Rh1 Rxh1 31.Qxh1 Ba4 32.Nd2 Qc6 33.Qb1 Be7 34.g4 fxg4 35.Bxg6 Qc8 36.Nf1 Qh8 37.Qf5 Qh3 38.Qxd5 Kxg6 39.Qg8+ Kh6 40.Qh8+ Kg6
31/44- 00:16 53,705k 3,282k -0.09 29. ... a5 30.Rh1
31/44+ 00:16 54,977k 3,284k 0.00 29. ... a5
31/44 00:16 55,119k 3,283k 0.00 29. ... a5 30.Rh1 Rxh1 31.Qxh1 b5 32.Qd1 a4 33.Ne1 b4 34.axb4 Bxb4 35.Be2 Qc7 36.Nd3 Bd6 37.Qe1 Be7 38.Qd2 Bd6 39.Bf3 Qc4 40.Bd1 Qc7 41.Bf3
32/24 00:18 59,246k 3,291k 0.00 29. ... a5 30.Rh1 Rxh1 31.Qxh1 b5 32.Qd1 a4 33.Ne1 b4 34.axb4 Bxb4 35.Be2 Qc7 36.Nd3 Bd6 37.Qe1 Be7 38.Qd2 Bd6
33/46 00:19 63,793k 3,291k 0.00 29. ... a5 30.Rh1 Rxh1 31.Qxh1 b5 32.Qd1 a4 33.Ne1 b4 34.axb4 Bxb4 35.Be2 Qc7 36.Nd3 Bd6 37.Qe1 Be7 38.Qd2 Bd6 39.Bf3 Qc4 40.Be2
34/43 00:21 71,171k 3,300k 0.00 29. ... a5 30.Rh1 Rxh1 31.Qxh1 b5 32.Qd1 a4 33.Ne1 b4 34.axb4 Bxb4 35.Be2 Qc7 36.Nd3 Bd6 37.Qe1 Be7 38.Qd2 Bd6
35/57 00:24 81,149k 3,314k 0.00 29. ... a5 30.Rh1 Rxh1 31.Qxh1 b5 32.Qd1 a4 33.Ne1 b4 34.axb4 Bxb4 35.Be2 Qc7 36.Nd3 Bd6 37.Qe1 Be7 38.Qd2 Kf7 39.Bf3 Qc4 40.Be2
36/49 00:27 91,464k 3,323k 0.00 29. ... a5 30.Rh1 Rxh1 31.Qxh1 b5 32.Qd1 a4 33.Ne1 b4 34.axb4 Bxb4 35.Be2 Qc7 36.Nd3 Bd6 37.Qe1 Be7 38.Qd2 Be6 39.Qd1 Bd7 40.Bf3 Qc4 41.Be2
37/42 00:30 101,698k 3,333k 0.00 29. ... a5 30.Rh1 Rxh1 31.Qxh1 b5 32.Qd1 a4 33.Ne1 b4 34.axb4 Bxb4 35.Be2 Qc7 36.Nd3 Bd6 37.Qe1 Be7 38.Qd2 Bd6 39.Bf3 Qc4 40.Be2
38/43 00:34 115,192k 3,342k 0.00 29. ... a5 30.Rh1 Rxh1 31.Qxh1 b5 32.Qd1 a4 33.Ne1 b4 34.axb4 Bxb4 35.Be2 Qc7 36.Nd3 Bd6 37.Qe1 Be7 38.Qd2 Bd6 39.Bf3 Qc4 40.Nc5 Bxc5 41.dxc5 Bc6 42.Qa5 Bb5 43.Qa7+ Kh6 44.Kg3 Qc1 45.Qe7 Qe1+ 46.Kh2 Qh4+ 47.Kg1 Qe1+
39/42 00:43 144,331k 3,317k 0.00 29. ... a5 30.Rh1 Rxh1 31.Qxh1 b5 32.Qd1 a4 33.Ne1 b4 34.axb4 Bxb4 35.Be2 Qc7 36.Nd3 Bd6 37.Qe1 Be7 38.Qd2 Bd6
40/26 00:52 173,499k 3,311k 0.00 29. ... a5 30.Rh1 Rxh1 31.Qxh1 b5 32.Qd1 a4 33.Ne1 b4 34.axb4 Bxb4 35.Be2 Qc7 36.Nd3 Bd6 37.Qe1 Be7 38.Qd2 Bd6
41/24 01:03 205,680k 3,223k 0.00 29. ... a5 30.Rh1 Rxh1 31.Qxh1 b5 32.Qd1 a4 33.Ne1 b4 34.axb4 Bxb4 35.Be2 Qc7 36.Nd3 Bd6 37.Qe1 Be7 38.Qd2 Bd6
42/58 01:22 258,147k 3,124k 0.00 29. ... a5 30.Rh1 Rxh1 31.Qxh1 b5 32.Qd1 a4 33.Ne1 b4 34.axb4 Bxb4 35.Be2 Qc7 36.Nd3 Bd6 37.Qe1 Be7 38.Qd2 Kf7 39.Qd1 Bb5 40.Nc5 Bxe2 41.Kxe2 Bxc5 42.dxc5 Qxc5 43.Qxa4 g5 44.Qd7+ Kg6 45.Qe8+ Kg7 46.Kf3 Qc4 47.Qe7+ Kg6 48.fxg5 Qf1+ 49.Kg3 Qe1+ 50.Kh3 Qh1+ 51.Kg3
43/38 01:46 332,236k 3,121k 0.00 29. ... a5 30.Rh1 Rxh1 31.Qxh1 b5 32.Qd1 a4 33.Ne1 b4 34.axb4 Bxb4 35.Be2 Qc7 36.Nd3 Bd6 37.Qe1 Be7 38.Qd2 Bd6
44/63 02:08 402,626k 3,129k 0.00 29. ... a5 30.Rh1 Rxh1 31.Qxh1 b5 32.Qd1 a4 33.Ne1 b4 34.axb4 Bxb4 35.Be2 Qc7 36.Nd3 Bd6 37.Qe1 Be7 38.Qd2 Bd6 39.Bf3 Qc4 40.Nc5 Bxc5 41.dxc5 Bc6 42.Qa5 Bb5 43.Qa7+ Kh6 44.Kg3 Qb4 45.Qe7 Qe1+ 46.Kh3 Qh1+ 47.Kg3
45/36 02:49 529,202k 3,126k 0.00 29. ... a5 30.Rh1 Rxh1 31.Qxh1 b5 32.Qd1 a4 33.Ne1 b4 34.axb4 Bxb4 35.Be2 Qc7 36.Nd3 Bd6 37.Qe1 Be7 38.Qd2 Bd6
46/38 03:20 628,007k 3,136k 0.00 29. ... a5 30.Rh1 Rxh1 31.Qxh1 b5 32.Qd1 a4 33.Ne1 b4 34.axb4 Bxb4 35.Be2 Qc7 36.Nd3 Bd6 37.Qe1 Be7 38.Qd2 Bd6
47/58 04:06 785,377k 3,187k 0.00 29. ... a5 30.Rh1 Rxh1 31.Qxh1 b5 32.Qd1 a4 33.Ne1 b4 34.axb4 Bxb4 35.Be2 Qc7 36.Nd3 Bd6 37.Qe1 Be7 38.Qd2 Bd6 39.Qd1 Be7 40.Bf3 Qc4 41.Qd2 Bd6 42.Nc5 Bxc5 43.dxc5 Bc6 44.Qa5 Bb5 45.Qa7+ Kh6 46.Qa8 Qf1+ 47.Kg3 Qe1+ 48.Kh3 Qh1+ 49.Kg3
48/36 05:06 973,067k 3,175k 0.00 29. ... a5 30.Rh1 Rxh1 31.Qxh1 b5 32.Qd1 a4 33.Ne1 b4 34.axb4 Bxb4 35.Be2 Qc7 36.Nd3 Bd6 37.Qe1 Be7 38.Qd2 Bd6 39.Qd1 Be7
49/42 07:54 1,509,074k 3,178k 0.00 29. ... a5 30.Rh1 Rxh1 31.Qxh1 b5 32.Qd1 a4 33.Ne1 b4 34.axb4 Bxb4 35.Be2 Qc7 36.Nd3 Bd6 37.Qe1 Be7 38.Qd2 Bd6 39.Qd1 Be7 40.Bf3 Qc4 41.Nc5 Bxc5 42.dxc5 Bc6 43.Qd4 Qc2+ 44.Kg3 Qc1 45.Bd1 Qc4 46.Kh2 Qc1
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User avatar
Eelco de Groot
Posts: 4561
Joined: Sun Mar 12, 2006 2:40 am
Full name:   

Re: What's up with this endgame?

Post by Eelco de Groot »

(Between moves 50 and 60) Judging by the 0.95 scores here, at move 53 Kaissa thinks Stockfish blundered away the half point (quickly sees that 53..gxf4 is wrong) and this still draw:

[d]8/K1k5/1p3p2/3p1pp1/3P1P2/PB1bP1P1/8/8 b - -

Code: Select all

Engine: Kaissa IV NoContempt (512 MB)
by T. Romstad, M. Costalba, J. Kiiski, G. Linscott

47/56  0:01   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (4.541.153) 2948 

48/56  0:01   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (5.356.554) 2931 

49/74  0:02   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (6.209.495) 2904 

50/58  0:02   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (7.515.810) 2849 

51/81  0:02   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (8.396.265) 2863 

52/88  0:03   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (9.966.277) 2839 

53/70  0:05   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (14.724.393) 2749 

54/72  0:07   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (19.131.947) 2672 

55/66  0:08   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (23.581.088) 2669 

56/65  0:12   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (32.778.199) 2653 

57/66  0:14   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (38.759.338) 2637 

58/67  0:16   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (43.356.588) 2641 

59/74  0:19   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (51.429.877) 2642 

60/72  0:22   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (58.678.217) 2655 

61/84  0:27   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (71.881.321) 2629 

62/69  0:33   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (88.539.386) 2630 

63/78  0:42   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (112.127.249) 2627 

64/80  0:52   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (137.593.940) 2614 

65/76  1:00   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (159.174.962) 2615 

66/84  1:12   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (189.472.291) 2611 

67/104 1:27   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (227.447.324) 2591 

68/76  1:39   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (259.958.333) 2600 

69/86  2:01   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (313.842.433) 2589 

70/85  2:28   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (384.002.816) 2583 

71/118 5:00   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (767.602.300) 2557 

72/106 5:33   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (851.499.439) 2552 

73/82  6:02   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (925.840.872) 2554 

74/104 6:33   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (1.002.674.902) 2545 

75/83  7:13   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (1.100.181.306) 2539 

76/114 8:01   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (1.225.167.547) 2547
So it is the ProbCut code is my guess.
Debugging is twice as hard as writing the code in the first
place. Therefore, if you write the code as cleverly as possible, you
are, by definition, not smart enough to debug it.
-- Brian W. Kernighan
Top
Uri Blass
Posts: 10267
Joined: Thu Mar 09, 2006 12:37 am
Location: Tel-Aviv Israel

Re: What's up with this endgame?

Post by Uri Blass »

Eelco de Groot wrote: ↑Sat Jul 20, 2019 10:05 am (Between moves 50 and 60) Judging by the 0.95 scores here, at move 53 Kaissa thinks Stockfish blundered away the half point (quickly sees that 53..gxf4 is wrong) and this still draw:

[d]8/K1k5/1p3p2/3p1pp1/3P1P2/PB1bP1P1/8/8 b - -

Code: Select all

Engine: Kaissa IV NoContempt (512 MB)
by T. Romstad, M. Costalba, J. Kiiski, G. Linscott

47/56  0:01   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (4.541.153) 2948 

48/56  0:01   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (5.356.554) 2931 

49/74  0:02   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (6.209.495) 2904 

50/58  0:02   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (7.515.810) 2849 

51/81  0:02   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (8.396.265) 2863 

52/88  0:03   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (9.966.277) 2839 

53/70  0:05   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (14.724.393) 2749 

54/72  0:07   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (19.131.947) 2672 

55/66  0:08   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (23.581.088) 2669 

56/65  0:12   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (32.778.199) 2653 

57/66  0:14   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (38.759.338) 2637 

58/67  0:16   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (43.356.588) 2641 

59/74  0:19   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (51.429.877) 2642 

60/72  0:22   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (58.678.217) 2655 

61/84  0:27   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (71.881.321) 2629 

62/69  0:33   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (88.539.386) 2630 

63/78  0:42   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (112.127.249) 2627 

64/80  0:52   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (137.593.940) 2614 

65/76  1:00   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (159.174.962) 2615 

66/84  1:12   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (189.472.291) 2611 

67/104 1:27   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (227.447.324) 2591 

68/76  1:39   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (259.958.333) 2600 

69/86  2:01   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (313.842.433) 2589 

70/85  2:28   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (384.002.816) 2583 

71/118 5:00   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (767.602.300) 2557 

72/106 5:33   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (851.499.439) 2552 

73/82  6:02   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (925.840.872) 2554 

74/104 6:33   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (1.002.674.902) 2545 

75/83  7:13   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (1.100.181.306) 2539 

76/114 8:01   +0.95    53...Be4 54.Ba4 Bd3 55.Be8 Be2 56.a4 Bd1 
                       57.Bb5 Bc2 58.Ka6 Bb3 59.a5 bxa5 
                       60.Kxa5 Bd1 61.Bd3 Kc6 62.Bxf5 Be2 
                       63.Bc2 Bg4 64.Ba4+ Kc7 65.Kb5 Kd6 
                       66.Kb4 Bf5 (1.225.167.547) 2547
So it is the ProbCut code is my guess.
backward analysis suggested that after gxf4 black is losing but I do not believe gxf4 changes something
I guess white can ignore the pawns at g5 and g3 and play the same plan and black will be in zugzwang.
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Eelco de Groot
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Re: What's up with this endgame?

Post by Eelco de Groot »

Could be Uri but does Stockfish see that too? Without tablebases I don't think everything is reliable on my end. Black loses the move g4-g5 (Zwischenzug is that the right word?) though so that maybe changes the Zugzwang situation if he takes gxf4?
Debugging is twice as hard as writing the code in the first
place. Therefore, if you write the code as cleverly as possible, you
are, by definition, not smart enough to debug it.
-- Brian W. Kernighan
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Uri Blass
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Location: Tel-Aviv Israel

Re: What's up with this endgame?

Post by Uri Blass »

I can see that the difference is in the following position

[d]8/1k6/5pB1/K2p1pp1/3P1P2/3bP1P1/8/8 w - - 11 67

Here g4 is not good and without the pawns g5 e3 the move g4 is winning.
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Uri Blass
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Location: Tel-Aviv Israel

Re: What's up with this endgame?

Post by Uri Blass »

Ovyron wrote: ↑Sat Jul 20, 2019 8:44 am I just lost my first ICCF game since 2015, and I still don't know what happened.

At the end of 2017 I reached this endgame:

[d]8/3b2k1/1p3pp1/3p1p2/3P1P2/P3P3/5KP1/5B2 b - -

I analyzed it thoroughly and concluded it was an easy draw, as I couldn't find any progress for white. There were positions where Stockfish showed 0.00 up to depth 60. There were positions where Stockfish wouldn't show any progress up to depth 80 o_O

Note that my opponent had what I believed were more advantageous positions before, and he abandoned them for this endgame, which makes me believe he knew it was winning, which means this position is a white to move and mate in N.

I guess my analysis was done with engines that are now very updated, but I'd still like to know what's going on.

Full Pgn:

[pgn]1. d4 d5 2. Bf4 c5 3. c3 Nf6 4. e3 e6 5. Nd2 Nc6 6. Ngf3 Nh5 7. Bg5 f6 8. Bh4 g6 9. Be2 Ng7 10. Bg3 cxd4 11. cxd4 Nf5 12. O-O Kf7 13. a3 h5 14. Nh4 Nxg3 15. hxg3 Kg7 16. f4 Bd7 17. Nb3 b6 18. Bd3 Ne7 19. Rc1 Be8 20. g4 Rc8 21. Qf3 hxg4 22. Qxg4 Rh6 23. Nd2 Bd7 24. Qg3 Qe8 25. Ndf3 Nf5 26. Nxf5+ exf5 27. Rxc8 Qxc8 28. Qe1 Bd6 29. Kf2 b5 30. Qa5 Qb7 31. Rc1 Rh8 32. Bf1 Qb6 33. Qxb6 axb6 34. Ne1 b4 35. axb4 Ra8 36. Rc3 Ra1 37. Ra3 Rxe1 38. Kxe1 Bxb4+ 39. Kf2 Bxa3 40. bxa3 Ba4 41. Ke1 Kf7 42. Kd2 Ke7 43. Kc3 Kd6 44. Bd3 Kc7 45. Kb4 Bd1 46. Kb5 Bg4 47. Ka6 Bd1 48. Bb5 Bc2 49. Be8 Bd3+ 50. Ka7 g5 51. g3 Be2 52. Ba4 Bd3 53. Bb3 gxf4 54. exf4 Be4 55. Ba4 Bf3 56. Ka6 Be2+ 57. Bb5 Bg4 58. Bd3 Bh3 59. Kb5 Kb7 60. a4 Kc7 61. a5 bxa5 62. Kxa5 Kc6 63. Bb5+ Kc7 64. Ka6 Bg2 65. Be8 Bf1+ 66. Ka5 Bd3 67. Bg6 Bc2 68. Kb5 Kd6 69. Bh5 Bd3+ 70. Kb6 Bb1 71. Kb7 Be4 72. Kc8 Ke7 73. Kc7 Bd3 74. Kc6 Ke6 75. Be8 Bb1 76. Kc5 Be4 77. Bb5 Bh1 78. Ba6 Be4 79. Bb7 Kd7 80. Bxd5 Bc2 81. Bf7 Bd1 82. Bc4 Bf3 83. Bd3 Be4 84. Kc4 {Black Resigns. 1-0} [/pgn]
My thoughts are the following.
1)It is clear that only white has winning chances in the endgame.
White has a positional advantage because white's pawns are on black squares.
2)It seems that you played the position weaker than a computer and 53...gxf4 is probably not a mistake that stockfish does with a long analysis.

I am not sure if white wins after 53...Be4 or 53...Bc4(white is the only player who can win and stockfish does not see 0.00 here)

Stockfish with default parameters when I even did not change contempt to 0 except multi-pv=3 understand that gxf4 is bad(at smaller depths it does not because it expects White to reply gxf4 and not exf4)

Here is analysis by latest stockfish at depths 69-70

[d]8/K1k5/1p3p2/3p1pp1/3P1P2/PB1bP1P1/8/8 b - - 4 53


Stockfish_19071415_x64_modern:


69/84 03:04 794,236k 4,301k -0.98 53. ... Bc4 54.Bc2 Bb5 55.Bxf5 Be2 56.Be6 Bf3 57.Bf7 Be4 58.Be8 Bf3 59.Ka8 Be2 60.Ba4 Bh5 61.Bc2 Bf3 62.Ka7 Bg2 63.Bd1 Be4 64.Be2 Bh1 65.Ka6 Bg2 66.Bb5 Bh1 67.Bf1 Be4 68.Ka7 Bh1 69.Be2 Be4 70.Ba6 Bf3 71.Bd3 Bh1 72.Bf5 Bf3 73.Be6 Be4 74.Ka8 Bf3 75.Bf7 Be4 76.Be8 Bf3 77.Bb5 Bh1 78.Ba6 Bg2 79.Be2 Be4 80.Bg4 Bg2 81.Bh5 Bh1 82.Bd1 Bg2 83.Bb3 Bf3 84.Ka7 Be4 85.fxg5 fxg5 86.Bd1 Bg2 87.Bc2 Bh1 88.Ba4
69/72 03:04 794,236k 4,301k -0.78 53. ... gxf4 54.gxf4 Be4 55.Ba2 Bf3 56.Bb1 Bg4 57.Bd3 Bh3 58.Bc2 Bg4 59.Ba4 Bf3 60.Bb5 Bg2 61.Be2 Be4 62.Ka6 Bc2 63.Kb5 Be4 64.a4 Bc2 65.a5 bxa5 66.Kxa5 Kc6 67.Bb5+ Kc7 68.Ba6 Bb1 69.Be2 Kc6 70.Bd1 Bd3 71.Bb3 Bf1 72.Ba4+ Kb7 73.Bc2 Kc7 74.Bxf5 Kc6 75.Bc2 Be2 76.Kb4 Bf1 77.Ba4+ Kd6 78.Bb5 Bh3 79.Bd3 Be6 80.Kc3 Kc7 81.Bc2 Kc6 82.Bb1 Bg4 83.Bg6 Be2 84.Bc2 Bg4 85.Bb1 Be6 86.Kb4 Bg4 87.Bd3 Be6 88.f5 Bc8 89.e4
69/72 03:04 794,236k 4,301k -0.78 53. ... Be4 54.Ba2 gxf4 55.gxf4 Bf3 56.Bb1 Bg4 57.Bd3 Bh3 58.Bc2 Bg4 59.Ba4 Bf3 60.Bb5 Bg2 61.Be2 Be4 62.Ka6 Bc2 63.Kb5 Be4 64.a4 Bc2 65.a5 bxa5 66.Kxa5 Kc6 67.Bb5+ Kc7 68.Ba6 Bb1 69.Be2 Kc6 70.Bd1 Bd3 71.Bb3 Bf1 72.Ba4+ Kb7 73.Bc2 Kc7 74.Bxf5 Kc6 75.Bc2 Be2 76.Kb4 Bf1 77.Ba4+ Kd6 78.Bb5 Bh3 79.Bd3 Be6 80.Kc3 Kc7 81.Bc2 Kc6 82.Bb1 Bg4 83.Bg6 Be2 84.Bc2 Bg4 85.Bb1 Be6 86.Kb4 Bg4 87.Bd3 Be6 88.f5 Bc8 89.e4
---------------------------------------------------------------------------
70/172 12:22 3,244,697k 4,373k -3.18 53. ... gxf4 54.exf4 Be4 55.Ba4 Bd3 56.Be8 Bf1 57.Bg6 Bh3 58.Bh5 Bf1 59.Be8 Bd3 60.a4 Be2 61.Bb5 Bd1 62.Ka6 Bh5 63.Bd3 Bg4 64.a5 bxa5 65.Kxa5 Kc6 66.Bb5+ Kc7 67.Be8 Bd1 68.Kb5 Kd6 69.Kb6 Ke7 70.Bg6 Bc2 71.Kc5 Be4 72.Bh5 Bg2 73.Kb6 Kd6 74.Kb7 Bf1 75.Bd1 Bd3 76.Ba4 Be4 77.Kc8 Ke7 78.Kc7 Bd3 79.Kc6 Be4 80.Bb3 Ke6 81.Bd1 Bd3 82.Kc5 Be4 83.Bh5 Bg2 84.Be2 Kd7 85.Bb5+ Ke7 86.Bd3 Be4 87.Be2 Kd7 88.Bb5+ Ke6 89.Ba6 Ke7 90.Kb6 Kd6 91.Bb5 Ke7 92.Kc7 Bc2 93.Kb7 Kd6 94.Bf1 Ba4 95.Bd3 Bd7 96.Be2 Be6 97.Bb5 Bg8 98.Kc8 Bf7 99.Kd8 Be6 100.Ke8 Bg8 101.Bd3 Be6 102.Bc2 Bd7+ 103.Kd8 Ke6 104.Bd1 Bc6 105.Kc7 Bb5 106.Bb3 Be8 107.Bc2 Bg6 108.Kb7 Kd6 109.Bd1 Ke7 110.Kc7 Bf7 111.Bc2 Be6 112.Bb3 Bf7 113.Kc6 Be8+ 114.Kc5 Bd7 115.Bxd5 Bc8 116.Bc4
70/128 12:22 3,244,697k 4,373k -0.98 53. ... Bc4 54.Bc2 Bb5 55.Bxf5 Be2 56.Bg6 Bf3 57.Bd3 Bh1 58.Ka6 Bf3 59.Kb5 Bg4 60.Bf1 Bd7+ 61.Ka6 Bg4 62.Bb5 Bc8+ 63.Ka7 Bg4 64.Bd3 Bh5 65.Bb1 Bf3 66.Bg6 Bg2 67.Bc2 Bf3 68.Ba4 Be2 69.Bb3 Bf3 70.Ka8 Bg2 71.Ba4 Be4 72.Bd1 Bg2 73.Bh5 Bh1 74.Bf7 Be4 75.Ka7 Bf3 76.Be6 Be4 77.Bg4 Bg2 78.Be2 Be4 79.Ka6 Bg2 80.Kb5 Kb7 81.Bd3 Kc7 82.a4 Bf3 83.a5 bxa5 84.Bc2 g4 85.Bb3 Kd6 86.Kxa5 Kc6 87.Kb4 Be4 88.Ba4+ Kd6 89.Bb5 Bc2 90.Be2
70/98 12:22 3,244,697k 4,373k -0.78 53. ... Be4 54.Ba2 gxf4 55.gxf4 Bf3 56.Bb1 Bg4 57.Bd3 Bh3 58.Bc2 Bg4 59.Ba4 Bf3 60.Bb5 Bg2 61.Be2 Be4 62.Ka6 Bc2 63.Kb5 Be4 64.a4 Bc2 65.a5 bxa5 66.Kxa5 Kc6 67.Bb5+ Kc7 68.Ba6 Bb1 69.Be2 Kc6 70.Bd1 Bd3 71.Bb3 Bf1 72.Ba4+ Kb7 73.Bc2 Kc7 74.Bxf5 Kc6 75.Bc2 Be2 76.Kb4 Bf1 77.Ba4+ Kd6 78.Bb5 Bh3 79.Bd3 Be6 80.Kc3 Kc7 81.Bc2 Kc6 82.Bb1 Bg4 83.Bg6 Be2 84.Bc2 Bg4 85.Kb4 Bf3 86.Bg6 Be2 87.Bf5 Bf3 88.Kc3 Bg2 89.Bc2 Bf3 90.Bd3 Bg4 91.Kb4 Be6 92.f5 Bc8 93.e4
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Eelco de Groot
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Re: What's up with this endgame?

Post by Eelco de Groot »

Uri Blass wrote: ↑Sat Jul 20, 2019 10:34 am I can see that the difference is in the following position

[d]8/1k6/5pB1/K2p1pp1/3P1P2/3bP1P1/8/8 w - - 11 67

Here g4 is not good and without the pawns g5 e3 the move g4 is winning.
I think you are right Uri, with pawns g5 and e3 still on board Uly would have just drawn that particular position.

[d]8/2k5/5pB1/K2p1pp1/3P1P2/3bP1P1/8/8 b - -

Code: Select all

Engine: Kaissa IV NoContempt (one thread, version 154B, 512 MB)
by T. Romstad, M. Costalba, J. Kiiski, G. Linscott

40/42  0:01   +0.09    1...Kd6 2.Kb4 Bb1 3.Kc3 Be4 4.Bh5 Kc6 
                       5.Bd1 Kd6 6.Ba4 Bb1 7.Kd2 Be4 8.Be8 Ke7 
                       9.Bg6 Ke6 10.Bh5 Ke7 11.Kc3 Kd6 
                       12.Bd1 Ke6 13.Be2 Kd6 14.Kd2 Kc6 (3.861.746) 2577 
.
.
.

51/65  0:19   +0.09    1...Kb7 2.Kb4 Kb6 3.Kc3 Be4 4.Bh5 Kc6 
                       5.Bd1 Kd6 6.Kb4 Kc6 7.Ba4+ Kb6 8.Bb5 Bb1 
                       9.Be2 Be4 10.Bf1 Kc6 11.Bb5+ Kb6 
                       12.Ba4 Bd3 13.Bb3 Be4 14.Kc3 Kc6 (49.527.917) 2540 

52/80  0:22   +0.09    1...Kb7 2.Kb4 Kb6 3.Kc3 Be4 4.Bh5 Kc6 
                       5.Bd1 Kd6 6.Kb4 Kc6 7.Ba4+ Kb6 8.Bb5 Bb1 
                       9.Be2 Be4 10.Bf1 Kc6 11.Bb5+ Kb6 
                       12.Ba4 Bd3 13.Bb3 Be4 14.Kc3 Kc6 (56.317.455) 2546 

53/94  0:24   +0.19--  1...Kb7 2.Bf7 (62.540.039) 2549 

53/94  0:25   +0.28--  1...Kb7 2.Bf7 (65.115.468) 2551 

53/94  0:26   +0.42--  1...Kb7 2.Bf7 (66.767.371) 2555 

53/112 0:26   +0.62--  1...Kb7 2.Bf7 (68.984.535) 2561 

53/114 0:29   +0.89--  1...Kb7 2.Bf7 (76.456.234) 2577 

53/128 0:33   +1.24--  1...Kb7 2.Bf7 (86.264.393) 2563 

53/130 0:36   +1.24    1...Kb7 2.Bf7 Bc4 3.Be8 Bd3 4.Bd7 Kc7 
                       5.Bb5 Bc2 6.Be2 Kc6 7.Bh5 Bd3 8.Bf7 Bf1 
                       9.Be8+ Kc7 10.Bb5 Bg2 11.Bd3 Kc6 
                       12.Bxf5 Bf3 13.Kb4 Kd6 14.Kc3 Be2 (92.746.410) 2558 

54/74  0:40   +1.24    1...Kb7 2.Bf7 Bc4 3.Be8 Bd3 4.Bd7 Kc7 
                       5.Bb5 Bc2 6.Be2 Kc6 7.Bh5 Bd3 8.Bf7 Be2 
                       9.Be8+ Kb7 10.Bb5 Bg4 11.Bd3 Kc6 
                       12.Bc2 Be2 13.Ba4+ Kb7 14.Bb3 Kc6 (102.694.866) 2545 

55/87  0:44   +1.24    1...Kb7 2.Bf7 Bc4 3.Be8 Bd3 4.Bd7 Kc7 
                       5.Bb5 Be4 6.Ba6 Bc2 7.Be2 Kc6 8.Bh5 Bd3 
                       9.Bf7 Be2 10.Be8+ Kb7 11.Bb5 Bg4 
                       12.Bd3 Kc6 13.Bc2 Be2 14.Ba4+ Kb7 (113.062.363) 2548 
.
.
.

68/88  3:17   +1.06    1...Kb7 2.Be8 Kc7 3.Bb5 Bc2 4.Bf1 Kc6 
                       5.Be2 Be4 6.Ka6 Bc2 7.Bb5+ Kc7 8.Be8 Bd3+ 
                       9.Ka5 Kb7 10.Bg6 Be2 11.Kb4 Kc6 
                       12.Bxf5 Bf3 13.Ka5 Be2 14.Bg6 Kd6 (514.402.990) 2604 

69/92  3:43   +1.06    1...Kb7 2.Be8 Kc7 3.Bb5 Bc2 4.Bf1 Kc6 
                       5.Be2 Be4 6.Ka6 Bc2 7.Bb5+ Kc7 8.Be8 Bd3+ 
                       9.Ka5 Kb7 10.Bb5 Be4 11.Bf1 Kc6 
                       12.Be2 Bc2 13.Bh5 Bd3 14.Bf7 Bc4 (583.147.538) 2610 

70/106 4:12   +1.06    1...Kb7 2.Be8 Kc7 3.Bb5 Bc2 4.Bf1 Kc6 
                       5.Be2 Be4 6.Ka6 Bc2 7.Bb5+ Kc7 8.Be8 Bd3+ 
                       9.Ka5 Kb7 10.Bd7 Be2 11.Be6 Kc6 
                       12.Bxf5 Bd1 13.Kb4 Kb6 14.Be6 Kc6 (662.229.648) 2620 

71/88  4:44   +1.06    1...Kb7 2.Be8 Kc7 3.Bb5 Bc2 4.Bf1 Kc6 
                       5.Be2 Be4 6.Ka6 Bc2 7.Bb5+ Kc7 8.Ka5 Be4 
                       9.Ba4 Bd3 10.Be8 Kb7 11.Bd7 Be2 
                       12.Be6 Kc6 13.Bxf5 Bd1 14.Kb4 Kb6 (746.751.186) 2620 

72/124 5:11   +1.06    1...Kb7 2.Be8 Kc7 3.Bb5 Bc2 4.Bf1 Kc6 
                       5.Be2 Be4 6.Ka6 Bc2 7.Bb5+ Kc7 8.Ka5 Be4 
                       9.Ba4 Bd3 10.Be8 Kb7 11.Bd7 Be2 
                       12.Bxf5 Kc6 13.Bg6 Kd6 14.Kb6 Bg4 (820.693.153) 2631 

73/92  5:49   +1.06    1...Kb7 2.Be8 Kc7 3.Bb5 Bc2 4.Bf1 Kc6 
                       5.Be2 Be4 6.Ka6 Bc2 7.Bb5+ Kc7 8.Ka5 Be4 
                       9.Ba4 Bd3 10.Be8 Kb7 11.Bd7 Be2 
                       12.Bxf5 Kc6 13.Bg6 Kd6 14.Kb6 Bg4 (921.674.847) 2640 

74/123 6:28   +1.06    1...Kb7 2.Be8 Kc7 3.Bb5 Bc2 4.Bf1 Kc6 
                       5.Be2 Be4 6.Ka6 Bc2 7.Bb5+ Kc7 8.Ka5 Be4 
                       9.Kb4 Kb6 10.Be8 Bd3 11.Bf7 Kc6 
                       12.Ka5 Be2 13.Be8+ Kb7 14.Ba4 Kc7 (1.025.020.943) 2641 

75/95  7:37   +1.06    1...Kb7 2.Be8 Kc7 3.Bb5 Bc2 4.Bf1 Kc6 
                       5.Be2 Be4 6.Ka6 Bc2 7.Bb5+ Kc7 8.Ka5 Be4 
                       9.Bf1 Kc6 10.Be2 Bg2 11.Bd1 Bf1 
                       12.Ba4+ Kb7 13.Bb5 Bg2 14.Bd7 Kc7 (1.206.746.408) 2636 

76/94  9:13   +1.06    1...Kb7 2.Be8 Kc7 3.Bb5 Bc2 4.Bf1 Kc6 
                       5.Be2 Be4 6.Bb5+ Kc7 7.Ka6 Bf3 8.Bd3 Kc6 
                       9.Bxf5 Be2+ 10.Ka5 Bd1 11.Kb4 Kb6 
                       12.Be6 Kc6 13.Kc3 Kd6 14.Bf5 Kc7 (1.461.914.389) 2640 

77/92  10:27  +1.06    1...Kb7 2.Be8 Kc7 3.Bb5 Bc2 4.Bf1 Kc6 
                       5.Be2 Be4 6.Bb5+ Kc7 7.Ka6 Bf3 8.Bd3 Kc6 
                       9.Bxf5 Be2+ 10.Ka5 Bd1 11.Kb4 Kb6 
                       12.Be6 Kc6 13.Kc3 Kd6 14.Bf5 Kc7 (1.650.618.982) 2632 

78/102 13:00  +1.06    1...Kb7 2.Be8 Kc7 3.Bb5 Bc2 4.Bf1 Kc6 
                       5.Be2 Be4 6.Bb5+ Kc7 7.Ka6 Bf3 8.Bd3 Kc6 
                       9.Bxf5 Be2+ 10.Ka5 Bd1 11.Kb4 Kb6 
                       12.Be6 Kc6 13.Kc3 Kd6 14.Bf5 Kc7 (2.075.730.186) 2660 

79/106 14:59  +1.06    1...Kb7 2.Be8 Kc7 3.Bb5 Bc2 4.Bf1 Kc6 
                       5.Be2 Be4 6.Bb5+ Kc7 7.Ka6 Bf3 8.Bd3 Kc6 
                       9.Bxf5 Be2+ 10.Ka5 Bd1 11.Kb4 Kb6 
                       12.Be6 Kc6 13.Kc3 Kd6 14.Bf5 Kc7 (2.384.928.725) 2651

But without those pawns:

[d]8/2k5/5pB1/K2p1p2/3P1P2/3b2P1/8/8 b - -

73/143 23:05 +7.59-- 67...Bc2 68.Kb5 (4.566.837.764) 3297

73/143 33:38 +8.86-- 67...Bc2 68.Kb5 (6.490.206.493) 3215
Debugging is twice as hard as writing the code in the first
place. Therefore, if you write the code as cleverly as possible, you
are, by definition, not smart enough to debug it.
-- Brian W. Kernighan
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