Interesting Puzzle for Engines

abgursu · Post by **abgursu** » Mon Jan 11, 2021 7:23 pm

In my Kings & Pawns tests, I found a interesting endgame problem which I believe lots of engines won't see quickly. (My computer needed lots of time to even realize this)
[d]8/1p6/4k1pp/p1p1p3/4P3/1PP4K/P2P3P/8 b - - 0 13
For copying: 8/1p6/4k1pp/p1p1p3/4P3/1PP4K/P2P3P/8 b - - 0 13
As you see the below, both Eman and Ethereal didn't see a4! and a win coming.
Game:
[pgn][Event "Games 1, Blitz 3m+5s"]
[Site "?"]
[Date "2020.12.30"]
[Round "64.1"]
[White "Ethereal 12.75 (POPCNT)"]
[Black "Eman 6.61 64-bit SSE41, POPCNT."]
[Result "1/2-1/2"]
[Annotator "0.86;0.00"]
[SetUp "1"]
[FEN "4k3/pppppppp/8/8/8/8/PPPPPPPP/4K3 w - - 0 1"]
[PlyCount "164"]
[EventDate "2020.12.29"]
[EventType "tourn"]
[SourceTitle "Fritz Engine Tournament"]
[Source "Light"]

1. f4 {[%eval 86,25] [%emt 0:01:02]} d6 {[%eval 0,21] [%emt 0:00:16]} 2. Kf2 {[%eval 90,19] [%emt 0:
00:10]} e5 {[%eval 0,21] [%emt 0:00:11] (Kd7)} 3. Ke3 {[%eval 117,19] [%emt 0:
00:14] (Kf3)} Kd7 {[%eval -10,23] [%emt 0:00:03]} 4. Ke4 {[%eval 97,19] [%emt
0:00:06]} Ke6 {[%eval -4,24] [%emt 0:00:04] (exf4)} 5. fxe5 {[%eval 68,21]
[%emt 0:00:16] (f5+)} dxe5 {[%eval -14,21] [%emt 0:00:03]} 6. g4 {[%eval 1,19]
[%emt 0:00:06] (Kf3)} h6 {[%eval -13,24] [%emt 0:00:09] (a5)} 7. b3 {[%eval -1,
22] [%emt 0:00:28] (b4)} g6 {[%eval -3,39] [%emt 0:00:08] (a5)} 8. Kf3 {
[%eval 1,22] [%emt 0:00:11] (a4)} f5 {[%eval -7,26] [%emt 0:00:06]} 9. gxf5+ {
[%eval 0,23] [%emt 0:00:08] (e4)} Kxf5 {[%eval -7,24] [%emt 0:00:04]} 10. e4+ {
[%eval -1,24] [%emt 0:00:06]} Ke6 {[%eval -22,27] [%emt 0:00:05]} 11. Kg4 {
[%eval -65,23] [%emt 0:00:39]} a5 {[%eval -24,29] [%emt 0:00:03] (Kd6)} 12. c3
{[%eval -74,23] [%emt 0:00:16] (Kg3)} c5 {[%eval -13,34] [%emt 0:00:05] (b5)}
13. Kh3 {[%eval -126,26] [%emt 0:00:24] (c4)} b5 {[%eval -125,30] [%emt 0:00:
05]} 14. c4 {[%eval -174,22] [%emt 0:00:03] (Kg4)} b4 {[%eval -94,36] [%emt 0:
00:05]} 15. Kg3 {[%eval -189,31] [%emt 0:00:05] (Kg4)} Kf6 {[%eval -86,43]
[%emt 0:00:04] (Kd6)} 16. Kg4 {[%eval -189,33] [%emt 0:00:04] (Kh4)} Kf7 {
[%eval -55,48] [%emt 0:00:11] (Ke7)} 17. Kg3 {[%eval -189,33] [%emt 0:00:03]
(Kh4)} Kf6 {[%eval -48,48] [%emt 0:00:09] (Ke6)} 18. Kg4 {[%eval -189,34]
[%emt 0:00:03] (Kh4)} Ke7 {[%eval -48,50] [%emt 0:00:04] (Kf7)} 19. Kh4 {
[%eval -188,35] [%emt 0:00:04] (Kh3)} Ke8 {[%eval -31,46] [%emt 0:00:07]} 20.
Kh3 {[%eval -184,34] [%emt 0:00:11] (Kg3)} Kd8 {[%eval -28,50] [%emt 0:00:06]
(Kd7)} 21. Kg3 {[%eval -172,34] [%emt 0:00:07] (Kh4)} Ke7 {[%eval -28,50]
[%emt 0:00:08]} 22. Kh4 {[%eval -172,31] [%emt 0:00:05] (Kh3)} Kf7 {[%eval -28,
51] [%emt 0:00:07] (Ke8)} 23. Kg3 {[%eval -170,34] [%emt 0:00:06]} Kg7 {
[%eval -27,49] [%emt 0:00:07] (Ke6)} 24. Kg4 {[%eval -187,26] [%emt 0:00:05]
(Kh4)} Kf6 {[%eval -27,48] [%emt 0:00:05]} 25. h3 {[%eval -162,29] [%emt 0:00:
05] (Kh4)} Kg7 {[%eval -28,45] [%emt 0:00:06] (Ke7)} 26. Kf3 {[%eval -165,32]
[%emt 0:00:05] (Kg3)} Kf6 {[%eval -20,50] [%emt 0:00:05] (Kf7)} 27. Kg4 {
[%eval -179,33] [%emt 0:00:05]} Ke7 {[%eval -20,48] [%emt 0:00:05]} 28. Kh4 {
[%eval -177,36] [%emt 0:00:05] (Kf3)} Kd7 {[%eval -20,83] [%emt 0:00:13] (Kf7)}
29. Kg4 {[%eval -177,31] [%emt 0:00:04] (Kg3)} Ke7 {[%eval -20,57] [%emt 0:00:
04] (a4)} 30. Kh4 {[%eval -179,35] [%emt 0:00:04]} Kf7 {[%eval -20,57] [%emt 0:
00:06] (Ke6)} 31. Kg3 {[%eval -180,35] [%emt 0:00:03]} Kg7 {[%eval -20,54]
[%emt 0:00:09] (Ke6)} 32. Kf3 {[%eval -185,36] [%emt 0:00:03]} Kf7 {[%eval -19,
50] [%emt 0:00:09]} 33. Kg4 {[%eval -177,36] [%emt 0:00:03]} Ke6 {[%eval -19,
50] [%emt 0:00:06] (Kf6)} 34. Kg3 {[%eval -177,29] [%emt 0:00:03] (Kh4)} Kd7 {
[%eval -19,51] [%emt 0:00:07]} 35. Kh4 {[%eval -177,37] [%emt 0:00:05] (Kg4)}
Kc6 {[%eval -19,53] [%emt 0:00:05] (Ke7)} 36. Kg3 {[%eval -170,28] [%emt 0:00:
03] (Kg4)} Kd7 {[%eval -19,53] [%emt 0:00:05]} 37. Kh4 {[%eval -181,27] [%emt
0:00:03] (Kg4)} Ke7 {[%eval -19,52] [%emt 0:00:06] (a4)} 38. Kg4 {[%eval -178,
38] [%emt 0:00:04]} Kf7 {[%eval -19,53] [%emt 0:00:05] (Kf6)} 39. Kh4 {[%eval
-178,39] [%emt 0:00:05] (Kg3)} Kf8 {[%eval -19,52] [%emt 0:00:05] (g5+)} 40.
Kg4 {[%eval -178,39] [%emt 0:00:05]} Kf7 {[%eval -19,56] [%emt 0:00:06]} 41.
Kf3 {[%eval -177,34] [%emt 0:00:07] (Kg3)} h5 {[%eval -19,54] [%emt 0:00:13]
(Ke6)} 42. Kg3 {[%eval -177,31] [%emt 0:00:07]} g5 {[%eval -19,43] [%emt 0:00:
04]} 43. Kg2 {[%eval -177,33] [%emt 0:00:03] (Kf3)} Kf6 {[%eval -19,48] [%emt
0:00:06] (Kf8)} 44. Kg3 {[%eval -169,30] [%emt 0:00:03] (Kf3)} Kf7 {[%eval -19,
50] [%emt 0:00:05] (Kg6)} 45. Kf2 {[%eval -157,33] [%emt 0:00:03] (Kf3)} Kg6 {
[%eval -18,48] [%emt 0:00:08] (Ke7)} 46. Kf3 {[%eval -157,36] [%emt 0:00:03]}
Kh6 {[%eval -17,41] [%emt 0:00:05] (Kf6)} 47. Kg3 {[%eval -157,38] [%emt 0:00:
05]} Kg6 {[%eval -17,50] [%emt 0:00:06] (Kg7)} 48. Kf3 {[%eval -157,38] [%emt
0:00:04]} Kh6 {[%eval -17,52] [%emt 0:00:06] (Kf7)} 49. Kg3 {[%eval -157,40]
[%emt 0:00:05]} Kh7 {[%eval -17,53] [%emt 0:00:06] (Kg7)} 50. Kf2 {[%eval -167,
37] [%emt 0:00:04] (Kg2)} Kg7 {[%eval -17,54] [%emt 0:00:14] (Kg8)} 51. Kg2 {
[%eval -153,36] [%emt 0:00:04]} Kf8 {[%eval -17,54] [%emt 0:00:09]} 52. Kg3 {
[%eval -153,37] [%emt 0:00:03]} Kg7 {[%eval -17,54] [%emt 0:00:06] (Ke7)} 53.
Kf2 {[%eval -154,38] [%emt 0:00:03] (Kg2)} Kf6 {[%eval -17,47] [%emt 0:00:11]
(Kf7)} 54. Kf3 {[%eval -149,38] [%emt 0:00:09] (Kg3)} Kg6 {[%eval -17,46]
[%emt 0:00:05]} 55. Kg3 {[%eval -149,38] [%emt 0:00:04]} Kh6 {[%eval -16,48]
[%emt 0:00:07] (Kf6)} 56. Kf3 {[%eval -152,40] [%emt 0:00:04]} Kh7 {[%eval -16,
53] [%emt 0:00:05] (Kg7)} 57. Kf2 {[%eval -150,38] [%emt 0:00:03] (Kg2)} Kg7 {
[%eval -16,50] [%emt 0:00:05]} 58. Kg2 {[%eval -145,33] [%emt 0:00:03]} Kf6 {
[%eval -16,54] [%emt 0:00:05]} 59. Kg3 {[%eval -154,38] [%emt 0:00:03]} Ke7 {
[%eval -16,53] [%emt 0:00:08] (Ke6)} 60. Kf2 {[%eval -153,38] [%emt 0:00:05]
(Kf3)} Kd7 {[%eval -16,49] [%emt 0:00:06] (Kd6)} 61. Ke1 {[%eval -149,30]
[%emt 0:00:03] (Kg3)} Kc8 {[%eval -7,45] [%emt 0:00:10] (Ke6)} 62. Kf2 {
[%eval -152,35] [%emt 0:00:04] (Kf1)} Kd8 {[%eval -6,46] [%emt 0:00:05] (a4)}
63. Kf1 {[%eval -152,38] [%emt 0:00:05] (Kg2)} Ke8 {[%eval -6,48] [%emt 0:00:
06] (Kd7)} 64. Ke2 {[%eval -152,38] [%emt 0:00:04] (Kf2)} Kf8 {[%eval -6,51]
[%emt 0:00:10] (Ke7)} 65. Kf2 {[%eval -152,39] [%emt 0:00:05] (Kf3)} Ke7 {
[%eval -6,48] [%emt 0:00:04] (Kf7)} 66. Kg2 {[%eval -154,33] [%emt 0:00:04]
(Kf3)} Kd8 {[%eval -6,43] [%emt 0:00:08] (a4)} 67. Kg3 {[%eval -154,38] [%emt
0:00:05] (Kf2)} Ke8 {[%eval -5,48] [%emt 0:00:05] (Kc7)} 68. Kg2 {[%eval -154,
38] [%emt 0:00:04] (Kf2)} a4 {[%eval -5,49] [%emt 0:00:05] (Kd7)} 69. Kh2 {
[%eval -154,40] [%emt 0:00:07] (Kf2)} Kd7 {[%eval -5,49] [%emt 0:00:07] (Kf7)}
70. Kg3 {[%eval -136,33] [%emt 0:00:24] (Kg2)} Ke7 {[%eval -5,50] [%emt 0:00:
05] (a3)} 71. Kg2 {[%eval -135,34] [%emt 0:00:06]} Kf6 {[%eval -5,51] [%emt 0:
00:16] (Kf7)} 72. Kg3 {[%eval -135,33] [%emt 0:00:03] (Kf3)} Ke6 {[%eval -5,40]
[%emt 0:00:04]} 73. Kg2 {[%eval -119,35] [%emt 0:00:09] (Kf3)} Kd6 {[%eval 0,
45] [%emt 0:00:05]} 74. Kg3 {[%eval -100,36] [%emt 0:00:06] (Kf2)} axb3 {
[%eval 0,49] [%emt 0:00:05] (Ke6)} 75. axb3 {[%eval -1,34] [%emt 0:00:05]} Ke6
{[%eval 0,55] [%emt 0:00:05]} 76. Kf2 {[%eval -1,40] [%emt 0:00:04]} Kf7 {
[%eval 0,56] [%emt 0:00:06]} 77. Kf3 {[%eval -1,40] [%emt 0:00:07] (Kg2)} Kf6 {
[%eval 0,60] [%emt 0:00:05] (Ke7)} 78. Ke3 {[%eval -1,39] [%emt 0:00:04] (Kg2)}
Kg6 {[%eval 0,57] [%emt 0:00:07] (Ke6)} 79. Kf3 {[%eval -1,42] [%emt 0:00:03]}
Kf6 {[%eval 0,60] [%emt 0:00:04] (Kf7)} 80. Kg3 {[%eval -1,41] [%emt 0:00:07]
(Kg2)} Ke7 {[%eval 0,62] [%emt 0:00:09] (Kg7)} 81. Kf2 {[%eval -1,42] [%emt 0:
00:03] (Kf3)} Ke6 {[%eval 0,65] [%emt 0:00:04] (Kd6)} 82. Kg2 {[%eval -1,43]
[%emt 0:00:05] (Kf3)} Kf6 {[%eval 0,63] [%emt 0:00:44] (Kd6) adjud.} 1/2-1/2[/pgn]

Vinvin · Post by **Vinvin** » Tue Jan 12, 2021 3:13 am

abgursu wrote: ↑Mon Jan 11, 2021 7:23 pm In my Kings & Pawns tests, I found a interesting endgame problem which I believe lots of engines won't see quickly. (My computer needed lots of time to even realize this)
[d]8/1p6/4k1pp/p1p1p3/4P3/1PP4K/P2P3P/8 b - - 0 13
For copying: 8/1p6/4k1pp/p1p1p3/4P3/1PP4K/P2P3P/8 b - - 0 13
As you see the below, both Eman and Ethereal didn't see a4! and a win coming.

a4! is difficult to find for a lot of engines.
I added the position here : http://talkchess.com/forum3/viewtopic.p ... 45#p879045

Here are some results for current engines who find a4. Some are tested with 2 different NN-files.
CPU : i7-6 threads@4 GHz

Code: Select all

CF_EXT_x64_281220_ELTO_SSE41_popcnt:
Hybrid NNUE evaluation using nn-62ef826d1a6d.nnue enabled.
...
 55/65	01:42	1 504 607 843	14 691 283	-0,66	13. ... b5 14.c4 b4 15.Kg4 Ke7 16.Kf3 Kf6 17.Kg4 Ke6 18.Kf3 Ke7 19.Kg4 Ke8 20.Kh4 Kf7 21.Kg4 Kg8 22.Kh3 Kg7 23.Kg4 Kh7 24.Kh4 g5+ 25.Kg4 Kg6 26.Kg3 h5 27.h3 Kh6 28.Kf3 Kg7 29.Kg2 Kf6 30.Kf3 Kf7 31.Kg3 Kg6 32.Kf3 Kf6 33.Kg2 a4 34.Kf2 Ke7 35.Kg3 Ke6 36.Kf2 Kf6 37.Ke2 axb3 38.axb3 h4 39.Kf3 Kg7 40.Kg4 Kg6 41.d3 Kh6 42.Kf5 Kh5 43.Kxe5 g4 44.Kf4 gxh3 45.Kf3 Kg5
 56/71-	04:22	3 686 626 151	14 053 177	-0,75	13. ... a4
 56/71-	04:41	4 033 737 949	14 328 576	-0,83	13. ... a4
 56/75-	06:59	7 043 878 942	16 774 734	-2,13	13. ... a4
 56/75	07:06	7 206 840 602	16 887 457	-2,13	13. ... a4 14.bxa4 c4 15.Kg3 Kf7 16.Kg4 Kf6 17.a5 g5 18.Kh5 Kg7 19.h3 Kh7 20.Kg4 Kg6 21.Kf3 h5 22.Kf2 Kf6 23.Kf3 Ke6 24.Ke2 Kf7 25.Kf3 Kf6 26.Kg3 Ke6 27.Kf2 Kd7 28.Ke3 Kc6 29.a3 Kd7 30.Ke2 Ke6 31.Kf3 Kf6 32.Kg2 Kf7 33.Kg3 Ke8 34.h4 g4 35.Kg2 Kd7 36.Kf2 Kc8 37.Kg3 Kb8 38.Kh2 Ka7 39.a6
 57/62-	08:20	8 473 907 768	16 922 127	-2,22	13. ... a4

Code: Select all

Corchess_V6_x64_modern:
Found 511 tablebases
...
 43/48	00:17	 245 572 824	14 186 760	-1,03	13. ... b5 14.c4 b4 15.Kg3 g5 16.Kg4 Kf6 17.Kf3 h5 18.h3 Ke7 19.Kf2 Ke6 20.Kf3 a4 21.Kg3 Kd6 22.Kf2 a3 23.Kf3 Kc7 24.Ke3 Kc6 25.Kf2 Kb7 26.Ke2 Ka7 27.Ke3 Ka6 28.Kf3 Kb6 29.Ke3 Kc7 30.Kf3 Kd6 31.Kg3 Kd7 32.Kf2 Ke7 33.Kg3 Kf6 34.Kf3 Kf7 35.Kf2 h4 36.Kf3
 44/51-	00:49	 753 311 424	15 096 421	-1,16	13. ... a4
 44/51-	00:50	 776 094 689	15 224 408	-1,29	13. ... a4
 44/65-	01:11	1 195 538 989	16 621 791	-3,03	13. ... a4
 44/65	01:18	1 316 307 270	16 848 517	-3,14	13. ... a4 14.bxa4 c4 15.Kg3 Kf6 16.Kh4 g5+ 17.Kh5 Kg7 18.h3 Kh7 19.a3 Kg7 20.a5 Kh7 21.Kg4 Kg6 22.Kf3 h5 23.Ke3 Kf6 24.d3 cxd3 25.Kxd3 Ke6 26.Ke2 Kd6 27.c4 Kc5 28.Kd3 g4 29.h4 g3 30.Ke3 Kxc4 31.Kf3 Kb5 32.a6 Kxa6 33.Kxg3 Ka5 34.Kf3 b5 35.Ke2 b4 36.a4 b3 37.Kd1

Code: Select all

Corchess_x64_modern-NNUE-1.3:
Found 511 tablebases
NNUE evaluation using nn-eba324f53044.nnue enabled.
...
 46/51	00:45	 429 950 404	9 463 811	-0,79	13. ... b5 14.c4 b4 15.Kh4 Kf7 16.Kg3 a4 17.Kh3 Kf6 18.Kh4 a3 19.Kg4 Ke6 20.Kg3 Ke7 21.h3 Ke6 22.Kf3 Kf6 23.Kg4 Kg7 24.Kg3 g5 25.Kf2 Kg6 26.Kf3 h5 27.Kg3 Kh6 28.Kf3 Kg7 29.Kf2 Kf6 30.Ke2 Kf7 31.Kf2 Kg7 32.Kf3 Kh6 33.Kg3 Kg6 34.Kf3 h4 35.Kg4 Kh6 36.Kf5 Kh5 37.d3 Kh6 38.Kf6 g4
 47/57-	01:05	 626 334 068	9 537 307	-0,89	13. ... a4
 47/57-	01:11	 701 322 401	9 815 568	-1,00	13. ... a4
 47/65-	01:54	1 238 562 922	10 816 765	-2,19	13. ... a4
 47/65	01:56	1 260 699 553	10 826 938	-2,19	13. ... a4 14.Kh4 axb3 15.axb3 b5 16.c4 bxc4 17.bxc4 Kd6 18.Kg4 Kd7 19.h3 Kd6 20.d3 Kd7 21.Kg3 Ke6 22.Kh4 Kf6 23.Kg4 h5+ 24.Kh4 Kf7 25.Kg5 Kg7 26.Kh4 Kf6 27.Kg3 g5 28.Kf3 Ke7 29.Ke2 Kd6 30.Kf2 Kc6 31.Kf3 Kd7 32.Ke2 Ke7 33.Kd1 Ke6 34.Kc2 g4 35.hxg4 hxg4
 48/53+	02:14	1 539 164 839	11 480 221	-2,13	13. ... a4 14.bxa4

Code: Select all

Corchess_x64_modern-NNUE-1.3:
Found 511 tablebases
NNUE evaluation using nn-62ef826d1a6d.nnue enabled.
...
 49/51	01:04	 588 979 914	9 075 750	-0,87	13. ... b5 14.c4 b4 15.Kg4 Kd6 16.h3 Ke7 17.Kg3 Kf6 18.Kg4 Kf7 19.Kh4 a4 20.Kg4 Ke8 21.Kf3 Ke7 22.Kg3 Kf6 23.Kg4 a3 24.Kh4 Ke7 25.Kg4 Ke6 26.Kg3 Kd7 27.Kf2 Ke8 28.Kg3 Kf8 29.Kg2 Kg8 30.Kg3 Kg7 31.Kg4 Kh7 32.Kf3 Kh8 33.Kg4 Kg7 34.Kf3 Kf6 35.Kg4 Ke7 36.Kg3 Ke6 37.Kh4 Kd6 38.Kg3
 50/57-	02:58	1 784 615 578	10 022 382	-0,98	13. ... a4
 50/57-	03:04	1 857 591 714	10 085 904	-1,09	13. ... a4
 50/57-	04:01	2 746 848 609	11 351 646	-3,14	13. ... a4
 50/58	04:08	2 884 821 172	11 594 241	-3,14	13. ... a4 14.bxa4 Kf6 15.a5 c4 16.Kh4 g5+ 17.Kh5 Kg7 18.h3 Kh7 19.Kg4 Kg6 20.Kf3 h5 21.a3 Kf7 22.Ke3 Ke6 23.a4 Kd7 24.Kf3 Kc8 25.Kg2 Kc7 26.Kf3 Kd7 27.Kf2 Kd6 28.Ke2 Ke7 29.Kf3 Kf6 30.Kg3 Kg7 31.Kf2 Kf7 32.Kg3 Kf6 33.Kh2 g4 34.Kg2 gxh3+ 35.Kxh3 Kg5 36.Kg3 h4+ 37.Kh3 Kh5 38.Kg2 Kg4 39.Kh2

Code: Select all

Houdidit-modern:
... 
 34/63+	00:59	 880 925 907	14 794 000	-1,01	13. ... b5 14.c4
 34/67-	01:19	1 149 495 592	14 540 000	-1,19	13. ... a4
 34/67-	01:23	1 220 054 201	14 574 000	-1,26	13. ... a4
 34/67+	01:28	1 290 193 764	14 571 000	-1,19	13. ... a4 14.bxa4
 34/67-	01:31	1 326 738 595	14 556 000	-1,27	13. ... a4
 34/67-	01:50	1 611 818 992	14 618 000	-1,75	13. ... a4

Code: Select all

Honey-12-W-x86-64-modern:
Found 511 tablebases
NNUE evaluation using nn-eba324f53044.nnue enabled
...
 48/41	02:00	1 515 758 742	12 631 217	-0,41	13. ... b5 14.c4
 49/41-	02:33	1 915 588 161	12 451 902	-0,53	13. ... a4
 49/41-	02:37	1 972 926 789	12 488 143	-0,60	13. ... a4
 49/41-	02:59	2 333 600 259	12 996 069	-1,00	13. ... a4
 48/41	03:00	2 341 367 511	13 007 525	-1,00	13. ... a4
 49/55-	03:23	2 657 770 096	13 057 536	-1,24	13. ... a4
 49/83-	03:55	3 115 751 082	13 256 992	-1,56	13. ... a4

Code: Select all

Honey-12-W-x86-64-modern:
Found 511 tablebases
NNUE evaluation using nn-62ef826d1a6d.nnue enabled
...
 39/38	00:50	 616 449 314	12 328 739	-0,15	13. ... b5 14.c4
 40/46	00:53	 652 803 861	12 233 955	-0,41	13. ... a4 14.bxa4 Kf6 15.Kg4 c4 16.a5 g5 17.a3 Kg6 18.h3 h5+ 19.Kf3 Kf6 20.Kg3 Kg7 21.Kf3 Kg6 22.a4 Kf7 23.Kg2 Ke8 24.Kf2 Ke7 25.Kf3 Ke6 26.Ke3 Kf6 27.Ke2 Kf7 28.Kf3 Kg6 29.Kg3 Kf6 30.Kf2 g4 31.h4 Ke7 32.Kg2 Ke6 33.Kg3 Kd6 34.Kg2 Kc6 35.Kg3
 41/25-	00:59	 729 949 712	12 194 485	-0,48	13. ... a4
 40/25	01:00	 732 045 814	12 200 560	-0,48	13. ... a4
 41/33-	01:01	 754 645 855	12 235 251	-0,54	13. ... a4
 41/33-	01:02	 769 669 336	12 257 052	-0,63	13. ... a4
 41/33-	01:03	 783 176 032	12 288 583	-0,77	13. ... a4
 40/33	01:10	 865 909 775	12 369 962	-0,77	13. ... a4
 41/33-	01:10	 871 464 843	12 381 048	-0,94	13. ... a4
 41/40-	01:18	 982 395 263	12 508 056	-1,18	13. ... a4
 40/40	01:20	1 001 919 917	12 523 842	-1,18	13. ... a4
 41/48	01:20	1 010 982 248	12 515 254	-1,40	13. ... a4 14.bxa4 Kf6 15.Kg4 c4 16.Kh4 g5+ 17.Kh5 Kg7 18.a3 Kh7 19.a5 Kg7 20.Kg4 Kg6 21.a4 h5+ 22.Kg3 g4 23.Kh4 Kh6 24.Kg3 Kg5 25.h4+ Kf6 26.Kh2 Ke6 27.Kg2 Kd6 28.Kg3 Kc6 29.Kg2 Kc7 30.Kh2 Kb8 31.a6 bxa6 32.Kg3 Kc8 33.Kf2 Kd7 34.Kg2 Kc6 35.Kf2 Kb6 36.Kg1

jp · Post by jp » Tue Jan 12, 2021 7:48 am

abgursu wrote: ↑Mon Jan 11, 2021 7:23 pm In my Kings & Pawns tests, I found a interesting endgame problem which I believe lots of engines won't see quickly. (My computer needed lots of time to even realize this)
For copying: 8/1p6/4k1pp/p1p1p3/4P3/1PP4K/P2P3P/8 b - - 0 13
As you see the below, both Eman and Ethereal didn't see a4! and a win coming.

Good job! How did you find this, when the engines didn't?

abgursu · Post by **abgursu** » Tue Jan 12, 2021 9:00 am

jp wrote: ↑Tue Jan 12, 2021 7:48 am
abgursu wrote: ↑Mon Jan 11, 2021 7:23 pm In my Kings & Pawns tests, I found a interesting endgame problem which I believe lots of engines won't see quickly. (My computer needed lots of time to even realize this)
For copying: 8/1p6/4k1pp/p1p1p3/4P3/1PP4K/P2P3P/8 b - - 0 13
As you see the below, both Eman and Ethereal didn't see a4! and a win coming.
Good job! How did you find this, when the engines didn't?

This is the longest draw in my K&P database. Usually, long draws means first, a change in evaluations and after some moves one side realizes a draw and the other side's realizing takes more time(Eth here). I just analysed deeper at the time when both engines' eval is highest.
Both engines' and humans' normal move will be b5 here. If this was a tournament game I would play b5.

Jouni · Post by **Jouni** » Tue Jan 12, 2021 9:04 am

Normal SF finds quite fast:

Analysis by Stockfish 181220:

13...a4
-/+ (-1.19 ++) Depth: 49/52 00:00:29 522mN, tb=462044
13...a4
-/+ (-1.27 ++) Depth: 49/52 00:00:32 592mN, tb=508352
13...a4
-/+ (-1.40 ++) Depth: 49/52 00:00:35 672mN, tb=522366
13...a4
-/+ (-1.58 ++) Depth: 49/52 00:00:39 787mN, tb=536777
13...a4
-+ (-1.82 ++) Depth: 49/52 00:00:44 938mN, tb=545249
13...a4
-+ (-2.15 ++) Depth: 49/52 00:00:51 1119mN, tb=604761
13...a4
-+ (-2.58 ++) Depth: 49/54 00:01:00 1304mN, tb=694308
13...a4
-+ (-3.14 ++) Depth: 49/54 00:01:10 1554mN, tb=779651
13...a4 14.bxa4 Kf6 15.Kg4 c4 16.Kh4 g5+ 17.Kh5 Kg7 18.Kg4 Kg6 19.h3 h5+ 20.Kg3 Kf6 21.a5 Ke7 22.Kf2 Kd7 23.Ke3 Ke6 24.a6 bxa6 25.Ke2 Kf7 26.a4 Kf6 27.Ke3 a5 28.Kf3 Kg6 29.Ke2 h4 30.Ke3 Kh5 31.d3 cxd3 32.Kxd3 g4 33.Ke3 gxh3 34.Kf3 Kg5 35.c4 Kf6 36.Kf2 Ke7 37.Kg1
-+ (-3.14) Depth: 49/56 00:01:12 1589mN, tb=781254

AndrewGrant · Post by **AndrewGrant** » Tue Jan 12, 2021 9:27 am

abgursu wrote: ↑Mon Jan 11, 2021 7:23 pm As you see the below, both Eman and Ethereal didn't see a4! and a win coming.

I deem your claim Fake News. Ethereal, some version, running some Network.

info depth 37 seldepth 80 multipv 1 score cp 839 time 189702 nodes 13713555160 nps 72289000 tbhits 0 hashfull 460 pv a5a4 b3a4 e6f6 h3h4 c5c4 h4g4 g6g5 g4h5 f6g7 a4a5 g7h7 h5g4 h7g6 g4f3 h6h5 h2h3 g6f6 f3g3 f6f7 g3h2 f7e7 a2a3 e7d6 h2g2 d6d7 a3a4 d7d6 g2g1 d6c7 g1f1 c7c6 h3h4 g5g4 f1f2 c6c7 f2e2 c7d8 d2d4 c4d3 e2d3 d8e7 a5a6 b7a6 d3e2 e7d7 e2d2 d7d6 d2c1 g4g3 c1d2

abgursu · Post by **abgursu** » Tue Jan 12, 2021 9:49 am

AndrewGrant wrote: ↑Tue Jan 12, 2021 9:27 am
abgursu wrote: ↑Mon Jan 11, 2021 7:23 pm As you see the below, both Eman and Ethereal didn't see a4! and a win coming.
I deem your claim Fake News. Ethereal, some version, running some Network.

info depth 37 seldepth 80 multipv 1 score cp 839 time 189702 nodes 13713555160 nps 72289000 tbhits 0 hashfull 460 pv a5a4 b3a4 e6f6 h3h4 c5c4 h4g4 g6g5 g4h5 f6g7 a4a5 g7h7 h5g4 h7g6 g4f3 h6h5 h2h3 g6f6 f3g3 f6f7 g3h2 f7e7 a2a3 e7d6 h2g2 d6d7 a3a4 d7d6 g2g1 d6c7 g1f1 c7c6 h3h4 g5g4 f1f2 c6c7 f2e2 c7d8 d2d4 c4d3 e2d3 d8e7 a5a6 b7a6 d3e2 e7d7 e2d2 d7d6 d2c1 g4g3 c1d2

This is a Blitz Game Andrew. And on my computer, which is not a too strong one. I never said Ethereal can't, just takes time.

AndrewGrant · Post by **AndrewGrant** » Tue Jan 12, 2021 9:58 am

abgursu wrote: ↑Tue Jan 12, 2021 9:49 am
AndrewGrant wrote: ↑Tue Jan 12, 2021 9:27 am
abgursu wrote: ↑Mon Jan 11, 2021 7:23 pm As you see the below, both Eman and Ethereal didn't see a4! and a win coming.
I deem your claim Fake News. Ethereal, some version, running some Network.

info depth 37 seldepth 80 multipv 1 score cp 839 time 189702 nodes 13713555160 nps 72289000 tbhits 0 hashfull 460 pv a5a4 b3a4 e6f6 h3h4 c5c4 h4g4 g6g5 g4h5 f6g7 a4a5 g7h7 h5g4 h7g6 g4f3 h6h5 h2h3 g6f6 f3g3 f6f7 g3h2 f7e7 a2a3 e7d6 h2g2 d6d7 a3a4 d7d6 g2g1 d6c7 g1f1 c7c6 h3h4 g5g4 f1f2 c6c7 f2e2 c7d8 d2d4 c4d3 e2d3 d8e7 a5a6 b7a6 d3e2 e7d7 e2d2 d7d6 d2c1 g4g3 c1d2
This is a Blitz Game Andrew. And on my computer, which is not a too strong one. I never said Ethereal can't, just takes time.

I know lol. I'm only joking. 3 minutes on a bit stronger machine and its found very highly evaled. Still running it now out of curiosity. Wondering if a breakthrough can be found to convert to mate.

fishpov · Post by **fishpov** » Tue Jan 12, 2021 6:52 pm

Deep Shredder 13 seems very strong for this kind of position.
Found in less than 1 mn.

MikeB · Post by **MikeB** » Wed Jan 13, 2021 4:21 am

a4! is a world class move - would be very impressive for a GM to find that over the board. There are some correspondence games that are decided on moves like that ...

Cfish is fastest on machine, just a few seconds, 220M nps is insane...

[d]8/1p6/4k1pp/p1p1p3/4P3/1PP4K/P2P3P/8 b - - 0 13

mover viewpoint fewer / Multi-PV setting = 1 / more
exclude: none best +tail
dep score nodes time (not shown: tbhits knps seldep)
50 +6.10! 36.1G 2:43.25 a4!
50 +5.85! 32.4G 2:26.88 a4!
50 +5.67! 27.8G 2:06.82 a4!
50 +5.55! 22.8G 1:45.39 a4!
50 +5.47! 19.8G 1:32.31 a4!
49 +5.38! 18.8G 1:27.66 a4!
48 +5.30 17.6G 1:22.21 a4 bxa4 c4 Kg4 Kf6 Kh4 g5+ Kh5 Kg7 a5 Kh7 a3 Kg7 Kg4 Kg6 Kg3 h5 h3 Kf7 Kf2 Kf6 Ke3 Ke7 Kf3 Kd6 Kg3 Kc6 a4 Kd7 Kf3 Kd6 Ke3 Ke6 Kf2 Ke7 Ke1 Kd7 Kd1 Kc7 d4 cxd3 c4 Kd6 Kd2 Kc6 a6 bxa6 Kxd3 Kc5 Kc3 a5 Kd3 g4 hxg4 hxg4 Ke3
48 +5.12! 12.0G 0:57.32 a4!
48 +4.94! 9.29G 0:45.15 a4!
48 +4.81! 8.57G 0:41.79 a4!
48 +4.73! 8.57G 0:41.77 a4!
47 +4.65 8.19G 0:39.99 a4 bxa4 c4 Kg4 Kf6 Kh4 g5+ Kh5 Kg7 a5 Kh7 a3 Kg7 h3 Kh7 a4 Kg7 Kg4 Kg6 Kf3 h5 Kg3 Kf6 Kf2 Ke6 Kg1 Kf7 Kf1 Ke7 Ke2 Ke6 Kf2 Kd7 Ke3 Kd6 Kf2 Kc7 Ke2 Kc8 d3 cxd3+ Kxd3 Kd7 Ke2 Kd6 Kf3 Kc5 Ke2 Kc4 a6 bxa6 Kd2
47 +4.45! 7.24G 0:35.63 a4!
47 +4.20! 6.95G 0:34.24 a4!
47 +4.02! 6.12G 0:30.46 a4!
47 +3.90! 5.59G 0:28.09 a4!
47 +3.82! 5.47G 0:27.53 a4!
46 +3.74 5.10G 0:25.84 a4 bxa4 c4 Kg4 Kf6 Kh3 g5 Kg4 Kg6 h3 Kf6 Kh5 Kg7 a3 Kh7 a5 Kg7 Kg4 Kg6 Kf3 h5 Ke2 Kf6 Ke3 Ke7 Kf3 Ke6 Ke3 Kd6 a4 Kd7 Kf3 Kc7 Kg3 Kb8 a6 bxa6 a5 Kc7 Kg2 Kc6 Kf1 Kc5 Ke2 Kd6 Kf3 Ke6 h4 g4+ Kf2 Ke7
46 +3.57! 4.28G 0:22.20 a4!
46 +3.39! 3.27G 0:17.62 a4!
46 +3.26! 3.26G 0:17.55 a4!
46 +3.18! 3.18G 0:17.14 a4!
45 +3.10 2.95G 0:16.09 a4 Kh4 b5 Kg4 axb3 axb3 c4 bxc4 bxc4 Kf3 h5 h4 Kf6 Kg2 g5 Kg3 g4 Kf2 Ke6 Ke1 Kd7 Ke2 Kd6 Kf2 Kc5 Ke2 Kb6 Ke3 Kc6 d4 cxd3 Kxd3 Kc5 Ke3 Kc4 Kd2 g3 Ke2 Kxc3 Kf3 Kd4 Kxg3 Kxe4 Kf2 Kf4 Kg2
45 +3.05! 2.64G 0:14.54 a4!
45 +2.33! 1.25G 0:07.97 a4!
45 +1.76! 1.13G 0:07.31 a4!
45 +1.33! 974.5M 0:06.31 a4!
45 +1.00! 792.8M 0:05.15 a4!
45 +0.76! 735.6M 0:04.82 a4!
45 +0.58! 678.7M 0:04.51 a4!
45 +0.46! 656.9M 0:04.39 a4!
45 +0.37! 622.7M 0:04.19 a4!
44 +0.29 439.2M 0:02.87 b5 c4 b4 Kh4 Kd7 Kh3 Ke7 Kh4 Kf8 Kg4 Kg7 Kh4 g5+ Kg4 Kg6 h3 h5+ Kf3 Kh6 Kg2 Kg7 Kf3 Kg6 Ke2 Kf7 Kf3 a4 Kg2 Kf6 Kf3 Ke7 Kg3 Ke6 Kf3 Kd7 Kg3 Ke7 Kf3 a3 Kg3 Kf6 Kg2 Kg7 Kf3 Kg6
43 +0.29 402.2M 0:02.62 b5 c4 b4 Kh4 Kd7 Kh3 Ke7 Kh4 Kf8 Kg4 Kg7 Kh4 g5+ Kg4 Kg6 h3 h5+ Kf3 Kh6 Kg2 Kg7 Kf3 Kg6 Ke2 Kf7 Kf3 a4 Kg2 Kf6 Kf3 Ke6 Kg3 a3 Kf3 Kf6 Kg2 Kg7 Kg3 Kh6 Kf2 Kh7 Kg2 h4 Kf1
42 +0.29 396.2M 0:02.58 b5 c4 b4 Kh4 Kd7 Kh3 Ke7 Kh4 Kf8 Kg4 Kg8 Kh3 Kg7 Kh4 g5+ Kg4 Kg6 h3 h5+ Kf3 Kf6 Kg2 a4 Kf3 a3 Kg2 Ke7 Kg3 Kf7 Kf2 Kg7 Kg2 Kf6 Kf3 Kg6 Ke2 Kh6 Kf2 h4 Ke2 Kg6 Kf2 g4 hxg4 Kg5 Kf3
41 +0.47 265.1M 0:01.67 b5 c4 b4 Kh4 Kf6 Kg4 Ke7 Kh3 Kf7 Kg3 a4 Kg4 Ke6 Kg3 Kf6 Kh4 a3 Kg4 Kf7 Kh3 Kg7 Kg3 h5 Kh4 Kh6 h3 g5+ Kg3 Kg7 Kg2 Kf7 Kf2 Kf6 Kf3 h4 Kf2 Kg6 Ke2 g4 hxg4 h3 Kf2 Kg5 Kg3 h2 Kxh2 Kxg4 Kg2 Kf4 Kf2 Kxe4
40 +0.54 241.2M 0:01.49 b5 c4 b4 Kh4 Kf6 Kg4 Ke7 Kh3 Kd6 Kh4 Kc6 Kg4 Kd7 Kg3 a4 Kh4 Ke8 Kh3 Kf7 Kg4 a3 Kh3 Ke7 Kg3 Ke6 Kh4 Kf6 Kg4 Kg7 Kg3 g5 Kg4 Kg6 h3 Kf6 Kf3 Ke7 Kg2 Ke6 Kf2 Kf7 Kg3 Kg7 Kg2 Kg6 Kf2 Kh5
39 +0.54 231.7M 0:01.43 b5 c4 b4 Kh4 Kf6 Kg4 Ke7 Kh3 Kd6 Kh4 Kc6 Kg4 Kd7 Kh4 a4 Kg4 Kd6 Kh3 a3 Kh4 Ke7 Kg3 Kf6 Kh4 Kf7 Kg4 Kg7 Kg3 h5 Kh4 Kh6 h3 g5+ Kg3 Kg7 Kg2 Kh7 Kf3 Kg6 Kf2 Kf7 Kg2 Ke7
38 +0.54 226.6M 0:01.40 b5 c4 b4 Kh4 Kf6 Kg4 Ke7 Kh3 Kd6 Kh4 Kc6 Kg4 Kd7 Kg3 a4 Kg4 Ke7 Kh4 Kf7 Kg3 a3 Kg4 Ke7 Kh4 Kf6 Kg4 Kf7 Kh4 Kg7 Kh3 h5 Kh4 Kh6 h3 g5+ Kg3 Kg6 Kf3 Kf7 Kg2 h4 Kf3 Kg7 Kf2 Kg6 Ke2
37 +0.60 212.6M 0:01.30 b5 c4 b4 Kh4 Kf6 Kg4 Ke7 Kh3 a4 Kh4 Ke6 Kg4 Kd7 Kh4 a3 Kh3 Ke8 Kg4 Kf7 Kg3 Ke7 Kg4 Kf6 Kh4 g5+ Kh5 Kg7 Kg4 Kg6 h3 h5+ Kf3 Kg7 Kg2 Kf6 Kf2 Kf7 Kg2 Kg7 Kf3 Kg6 Kf2 h4 Ke2 g4
36 +0.74 183.3M 0:01.11 b5 c4 b4 Kh4 Kf6 Kg4 Kf7 Kg3 Ke7 Kh3 Kd6 Kg3 Kc6 Kh4 Kc7 Kh3 a4 Kg4 Kd8 Kh3 Ke7 Kg4 Ke8 Kg3 Kf7 Kf3 Kf6 Kg4 Ke7 Kg3 Ke6 Kh4 Kd6 Kh3 a3 Kh4 Ke6 Kg4 Ke7 Kg3 Kf6
35 +0.79 166.2M 0:01.00 b5 c4 b4 Kh4 a4 Kg3 Ke7 Kh4 a3 Kg3 Ke6 Kh4 Kf6 Kg4 Kf7 Kh3 Kg7 Kg4 Kh7 Kh4 g5+ Kg4 Kg6 h3 Kf6 Kf3 Kg7 Kg2 h5 Kf3 Kg6 Kf2 h4 Ke2 Kh6 Kf2 g4 hxg4 Kg5 Kf3 h3 Kg3
34 +0.90 153.3M 0:00.93 b5 c4 b4 Kh4 Kf6 Kg4 Kf7 Kh4 a4 Kh3 Kf6 Kg4 a3 Kh4 Ke6 Kh3 Kf7 Kg4 Ke7 Kg3 g5 h3 Kf6 Kh2 Kg7 Kg3 h5 Kg2 Kg6 Kf3 Kf7 Ke2 Kg7 Kf3 Kg6 Kf2
33 +0.97 147.0M 0:00.89 b5 c4 b4 Kg3 a4 Kg4 a3 Kh3 g5 Kg3 Kf6 Kg4 Kg6 h3 h5+ Kf3 Kg7 Kg2 Kh6 Kg3 h4+ Kf2 Kg6 Ke2 Kg7 Kf3 Kf6 Kg2 Kg6 Kf2 Kf7 Kf1 Ke6 Kg2 Kf6
32 +1.07 139.8M 0:00.85 b5 c4 b4 Kg3 a4 Kg4 Ke7 Kh4 Kf6 Kg4 a3 Kh4 Kf7 Kg3 Kg7 Kh3 g5 Kg4 Kg6 Kg3 h5 h3 Kh7 Kh2 h4 Kg1 Kg7 Kf2 Kf6 Kg2 Ke7 Kf3 Kf7 Ke3 Kg6 Ke2
31 +1.07 139.3M 0:00.85 b5 c4 b4 Kh4 a4 Kg3 Ke7 Kg4 Kd6 Kh3 Kc6 Kh4 Kd7 Kg4 Ke7 Kh4 Kf6 Kg4 a3 Kh4 Kf7 Kg3 Kg7 Kh3 g5 Kg4 Kg6 Kg3 h5 h3 Kh7 Kh2 h4 Kg1 Kg7
30 +1.51 123.7M 0:00.76 b5 c4 b4 Kh4 Ke7 Kg3 a4 Kf3 Ke6 Kg4 a3 Kg3 Kf7 h3 g5 Kh2 h5 Kg1 h4 Kh1 Kg6 Kg2 Kh6 Kf2 g4 hxg4 Kg5 Kf3
29 +0.82 54.2M 0:00.36 b5 c4 b4 Kh4 a4 Kg3 Ke7 Kh4 Kd8 Kh3 Kd7 Kg4 axb3 axb3 Ke7 Kh3 Kf7 Kg4 Kg7 Kg3 h5 Kh4 Kh6 h3 g5+ Kg3 h4+ Kg4 Kg6 d3 Kh6 Kf5
28 +0.55 35.7M 0:00.25 b5 c4 b4 Kg4 Kd6 Kh4 Kd7 Kg3 a4 Kf3 Kd8 Kg2 axb3 axb3 Kd7 Kg3 Ke6 Kg4 Kf6 d3 Kf7 h4 Kg7 Kg3 Kf6 Kf3
27 +0.29 30.9M 0:00.22 b5 c4 b4 Kg3 Ke7 Kg4 Kd6 Kh3 Kd7 Kh4 Ke8 Kg4 Ke7 Kg3 Kf8 Kh4 Kg8 Kh3 Kg7 Kg3 g5 Kg4 Kg6 h3 Kf6 Kf3 Ke7 Kf2 Kf7 Ke2 Kg6
26 +0.35 30.2M 0:00.22 b5 c4 b4 Kg3 Kf7 Kh3 g5 Kg4 Kg6 h3 Kf6 Kf3 Kf7 Ke2 Kg7 Kf3 Kf6 Kg4 Kg6 Kf3 h5 Kg3 Kh6 Kf3 Kh7 Kg2 h4 Kf3 Kg7 Kg4 Kg6
25 +0.37 28.0M 0:00.20 b5 c4 b4 Kg3 Kf7 Kh3 Kf6 Kh4 g5+ Kg4 Kg6 h3 Kf6 Kf3 h5 Kg2 h4 Kf3 Kg7 Kg4 Kg6 d3 Kh6 Kf5 Kh5 Kxe5 g4 Kf4 g3 Kf3 Kg5 Kg2 Kf4
24 +0.96 13.2M 0:00.10 b5 c4 b4 Kg3 Kf6 Kg4 Kg7 Kh4 g5+ Kg4 Kg6 h3 h5+ Kg3 Kh6 Kf3 h4 Kg2 Kg6 Kf2 g4 hxg4 Kg5 Kf3
23 +0.75 9.31M 0:00.07 b5 c4 b4 Kg3 Kf6 Kh4 g5+ Kh5 Kg7 Kg4 Kg6 Kg3 h5 h3 h4+ Kg2 Kh6 Kf2 Kg7 Ke1 Kf6 Kf2 g4 hxg4 Kg5 Kf3
22 +0.57 7.05M 0:00.06 Kf6 Kg4 b5 c4 b4 Kh4 Kf7 Kh3 g5 Kg4 Kf6 Kh5 Kg7 h3 Kh7 Kg4 Kg6 Kf3 h5 Kg3 Kf6 Kf3
21 +0.16 4.55M 0:00.04 Kf7 c4 Kf6 Kg4 Ke6 Kh4 Ke7 Kg3 g5 Kg4 Kf6 Kh5 Kg7 h3 Kh7 Kg4 Kg6 Kf3 h5 Kg3 Kf7 Kf2 Ke6 Kg3 Ke7 Kg2
20 +0.19 2.75M 0:00.02 Kf6 Kg4 b5 c4 b4 Kh4 Kf7 Kg4 Kg7 Kh4 g5+ Kh5 Kh7 Kg4 Kg6 h3 h5+ Kf3 h4 Kg2 Kh5 Kf3 g4+ hxg4+ Kg5 d3
19 +0.23 2.19M 0:00.02 Kf6 Kg4 b5 c4 b4 Kh4 Kg7 Kg3 h5 Kh4 Kh6 h3 g5+ Kg3 h4+ Kf2 g4 hxg4 Kg5 Kf3 h3 Kg3 h2 Kxh2
18 +0.05 1.22M 0:00.01 Kf6 Kg4 b5 c4 b4 Kh4 Kf7 Kg4 Kg7 Kh4 g5+ Kg4 Kg6 h3 h5+ Kf3 Kh6 Kg3 Kg7 Kf3
17 0.00 1.08M 0:00.01 b5 c4 bxc4 bxc4 Kf6 Kh4 Ke7 Kg3 Kf8 Kh4 a4 a3 Kg7 Kg4 Kg8 Kh4
16 0.00 999979 0:00.01 b5 c4 bxc4 bxc4 Kf6 Kg4 a4 a3 Kf7 Kh4 Kg7 Kg4 Kf6 Kh4
15 +0.07 726303 0:00.01 b5 c4 bxc4 bxc4 Kf6 Kg4 a4 a3 Kf7 Kh4 Kg7 Kg4 Kf6 Kh4 Kf7
14 +0.11 605036 0:00.01 b5 c4 b4 Kh4 Kf7 Kg4 Kg8 h3 Kf8 h4 Kf7 h5 Kg7 hxg6
13 +0.11 544022 0:00.01 b5 c4 b4 Kh4 Kf7 Kg4 Kg8 h3 Kf8 h4 Kf7 h5 Kg7
12 +0.12 521486 0:00.01 b5 c4 b4 Kg4 Kf7 Kg3 Kg7 Kg4 Kg8 h4 Kf7 h5
11 +0.12 499503 0:00.01 b5 c4 b4 Kh4 Kf7 Kg4 Kf6 Kh4 Ke6 Kg4 Kf7 h4
10 +0.12 455385 0:00.01 Kf6 Kg4 b5 c4 b4 Kh4 Kg7 Kg4 Kf7 h4 Kg7 h5
9 +0.14 386063 0:00.01 Kf6 Kg4 b5 c4 b4 d3 Kf7 Kf3 Kg8 h4 Kf7
8 +0.35 123064 0:00.00 Kf6 Kg4 b5 h4 h5+ Kg3 a4 d3 b4
7 +0.56 39802 0:00.00 Kf6 Kg4 b5 d3 a4 b4 cxb4
6 +0.62 32550 0:00.00 Kf6 Kh4 b5 d3 a4 b4 cxb4
5 +0.67 18224 0:00.00 Kf6 Kg4 b5 c4 b4
4 +0.67 15193 0:00.00 Kf6 Kg4 b5 c4 b4
3 +0.81 4941 0:00.00 Kf6 Kg4 b5
2 +0.55 2396 0:00.00 Kf6 Kh4
1 Hybrid NNUE evaluation using nn-62ef826d1a6d.nnue enabled.
1 +1.14 1028 0:00.00 Kf6
0 #

Interesting Puzzle for Engines

Interesting Puzzle for Engines

Re: Interesting Puzzle for Engines

Re: Interesting Puzzle for Engines

Re: Interesting Puzzle for Engines

Re: Interesting Puzzle for Engines

Re: Interesting Puzzle for Engines

Re: Interesting Puzzle for Engines

Re: Interesting Puzzle for Engines

Re: Interesting Puzzle for Engines

Re: Interesting Puzzle for Engines