interesting position

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jdart
Posts: 4366
Joined: Fri Mar 10, 2006 5:23 am
Location: http://www.arasanchess.org

interesting position

Post by jdart »

This is from one of Andreas Strangmueller's matches:

[d]2rqkb1r/1pp1p1pp/1p3p2/1N1P4/5B2/5Q2/PP3PPP/n1R3K1 w k - 0 17

White (Fizbo 2) played Nxc7+ and won from here, but it looks to me that Qg4 might have been an even stronger move. This is quite a complex position though.

Some analysis:

[pgn][Event "?"] [Site "?"] [Date "2018.10.10"] [Round "1"] [White "Fizbo 2"] [Black "Xiphos 0.4"] [Result "1-0"] [ECO "B03"] [PlyCount "135"] [EventDate "2018.??.??"] 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. Nf3 Bg4 6. Be2 dxe5 7. c5 e4 8. cxb6 exf3 9. Bxf3 Bxf3 10. Qxf3 Nc6 11. d5 Nb4 12. O-O Nc2 13. Nc3 Nxa1 14. Bf4 axb6 15. Nb5 Rc8 16. Rc1 f6 17. Nxc7+ (17. Qg4 $1 Qd7 18. Qe6 c5 19. Nd6+ Kd8 20. Nxc8 Qxe6 21. dxe6 Kxc8 22. Rc4 g5 23. Bg3 f5 24. Be5 Bg7 25. Bxg7 $16) 17... Kf7 18. Qg4 g5 (18... h6 $5 19. h4 h5 20. Qe6+ Kg6) 19. Rc3 $1 h5 (19... Rg8 $5 ) 20. Qf5 Bh6 21. Be5 b5 22. b4 h4 23. h3 Rg8 24. Rc5 Rg6 25. Ne6 Qe8 26. Bxf6 exf6 27. Rxc8 Qxc8 28. Nxg5+ Rxg5 29. Qxc8 Rxd5 30. Qxb7+ Ke6 31. Qc6+ Ke5 32. Qc3+ Ke6 33. Qxa1 Bf4 34. Kf1 Be5 35. Qc1 Kd7 36. Qc2 Kd6 37. Qc8 Ke7 38. Qb7+ Kd6 39. Ke2 Bc3 40. Qb8+ Kd7 41. Qg8 Rd2+ 42. Ke3 Rd6 43. Qh7+ Kd8 44. Qxh4 Rd7 45. Qh8+ Ke7 46. h4 Rd6 47. Qg7+ Kd8 48. h5 Bd4+ 49. Kf3 Ke8 50. g4 Rd8 51. h6 f5 52. Qg8+ Ke7 53. Qg5+ Bf6 54. Qxf5 Rf8 55. Qc5+ Ke8 56. Ke4 Rg8 57. Kf5 Rg5+ 58. Kxf6 Rxc5 59. bxc5 Kd7 60. Ke5 Kc6 61. Kd4 Kb7 62. h7 Ka6 63. h8=Q Kb7 64. Qg7+ Kc6 65. Qh7 b4 66. Qa7 b3 67. axb3 Kb5 68. Qb6# 1-0 [/pgn]
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Eelco de Groot
Posts: 4561
Joined: Sun Mar 12, 2006 2:40 am
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Re: interesting position

Post by Eelco de Groot »

Hello Jon,

Good testposition, it appears that you are correct that 17. Qg4 is also winning, Kaissa sees three winning moves now. 17. Na7 can transpose after 17... Ra8 18. Nb5 Rc8 but Kaissa sees a different PV after a while, so that move is not a complete transposition with 17. Nxc7+

[d]2rqkb1r/1pp1p1pp/1p3p2/1N1P4/5B2/5Q2/PP3PPP/n1R3K1 w k -

Code: Select all

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

42     23:00  +1.49    17.Qg4 Qd7 18.Qe6 Qxe6 19.dxe6 g5 
                       20.Nxc7+ Rxc7 21.Rxc7 Kd8 22.Rd7+ Kc8 
                       23.Bg3 f5 24.Be5 Bg7 25.Bxg7 Rd8 
                       26.Rxd8+ Kxd8 27.Bc3 Nc2 28.Kf1 b5 
                       29.a3 Na1 30.b4 (2.861.521.385) 2073 

42     23:00  +1.32    17.Nxc7+ Kf7 18.Qg4 g5 19.Qe6+ Kg7 
                       20.Qf5 Kg8 21.d6 gxf4 22.d7 Rxc7 
                       23.Rxc7 Qxc7 24.Qd5+ Kg7 25.d8Q Qxd8 
                       26.Qxd8 Kg6 27.Qd1 Bg7 28.Qg4+ Kf7 
                       29.Qh5+ Ke6 30.Qd1 (2.861.521.385) 2073 

42     23:00  +1.11    17.Na7 c5 18.dxc6 Rxc6 19.Nxc6 bxc6 
                       20.Qxc6+ Kf7 21.Be3 Qd6 22.Qxb6 Qxb6 
                       23.Bxb6 Nb3 24.axb3 g5 25.Rc8 Bg7 
                       26.Rxh8 Bxh8 27.b4 f5 28.b3 Ke6 
                       29.Bc5 Be5 30.Kf1 (2.861.521.385) 2073 

42     23:00  +0.35    17.Qe4 Nc2 18.Qxc2 Qxd5 19.Nxc7+ Rxc7 
                       20.Qxc7 g5 21.Be3 Kf7 22.Qxb6 Bg7 
                       23.h4 Rd8 24.Rc5 Qd1+ 25.Kh2 gxh4 
                       26.Rc7 f5 27.Qc5 Qd6+ 28.Qxd6 Rxd6 
                       29.Rxb7 Rd1 30.Bg5 (2.861.521.385) 2073 

42     23:00  0.00     17.Rxc7 Rxc7 18.Nxc7+ Kf7 19.Qg4 g5 
                       20.Qe6+ Kg7 21.Qf5 Kf7 (2.861.521.385) 2073 
_____________________________________________________

43     29:05  +1.64    17.Qg4 Qd7 18.Qe6 Qxe6 19.dxe6 g5 
                       20.Nxc7+ Rxc7 21.Rxc7 Kd8 22.Bg3 f5 
                       23.Rd7+ Kc8 24.Be5 Bg7 25.Bxg7 Rd8 
                       26.Rxd8+ Kxd8 27.Kf1 Nc2 28.Bc3 b5 
                       29.a3 Kc7 30.Ke2 (3.626.605.816) 2077 

43     29:05  +1.42    17.Nxc7+ Kf7 18.Qg4 g5 19.Qe6+ Kg6 
                       20.Rc3 h5 21.Qe4+ Kf7 22.Qf5 Bh6 
                       23.Be5 Rg8 24.b4 Rg6 25.d6 exd6 
                       26.Ne6 Qe8 27.Rxc8 Qxc8 28.Nxg5+ Rxg5 
                       29.Qxc8 Rxe5 30.f4 (3.626.605.816) 2077 

43     29:05  +1.03    17.Na7 c5 18.dxc6 Rxc6 19.Nxc6 bxc6 
                       20.Qxc6+ Kf7 21.Be3 Qd6 22.Qxb6 Qxb6 
                       23.Bxb6 Nb3 24.axb3 g5 25.Rc8 Bg7 
                       26.Rxh8 Bxh8 27.Be3 g4 28.b4 f5 
                       29.b3 Ke6 30.g3 (3.626.605.816) 2077 

43     29:05  +0.37    17.Qe4 Nc2 18.Qxc2 Qxd5 19.Nxc7+ Rxc7 
                       20.Qxc7 Kf7 21.Be3 Qxa2 22.Qxb6 Qd5 
                       23.h3 e6 24.Rc7+ Kg6 25.f4 h5 26.Kf2 h4 
                       27.Qxb7 Qxb7 28.Rxb7 Bd6 29.Kf3 e5 
                       30.fxe5 (3.626.605.816) 2077 

43     29:05  0.00     17.Rxc7 Rxc7 18.Nxc7+ Kf7 19.Qg4 g5 
                       20.Qe6+ Kg7 21.Qf5 Kf7 (3.626.605.816) 2077 
_____________________________________________________

44     36:16  +1.59    17.Nxc7+ Kf7 18.Qg4 g5 19.Qe6+ Kg7 
                       20.Qf5 Kg8 21.d6 gxf4 22.d7 Rxc7 
                       23.Rxc7 Qxc7 24.Qd5+ Kg7 25.d8Q Qc1+ 
                       26.Qd1 Qxd1+ 27.Qxd1 e5 28.Qxa1 Bc5 
                       29.Qd1 Bd4 30.Qg4+ (4.492.368.874) 2063 

44     36:16  +1.53    17.Qg4 Qd7 18.Qe6 Qxe6 19.dxe6 g5 
                       20.Nxc7+ Rxc7 21.Rxc7 Kd8 22.Bg3 f5 
                       23.Rd7+ Kc8 24.Be5 Bg7 25.Bxg7 Rd8 
                       26.Rxd8+ Kxd8 27.Kf1 Nc2 28.Bc3 b5 
                       29.a3 Kc7 30.Ke2 (4.492.368.874) 2063 

44     36:16  +1.07    17.Na7 c5 18.dxc6 Rxc6 19.Nxc6 bxc6 
                       20.Qxc6+ Kf7 21.Be3 Qd6 22.Qxb6 Qxb6 
                       23.Bxb6 Nb3 24.axb3 g5 25.Rc8 Bg7 
                       26.Rxh8 Bxh8 27.Be3 g4 28.b4 f5 
                       29.b3 Ke6 30.g3 (4.492.368.874) 2063 

44     36:16  +0.37    17.Qe4 Nc2 18.Qxc2 Qxd5 19.Nxc7+ Rxc7 
                       20.Qxc7 Kf7 21.h4 g6 22.Qxb6 Bg7 
                       23.Rc7 Ra8 24.Qb4 Bf8 25.Qxb7 Qxb7 
                       26.Rxb7 Rxa2 27.Be3 f5 28.b4 Bg7 
                       29.g3 Ke6 30.Bc5 (4.492.368.874) 2063 

44     36:16  0.00     17.Rxc7 Rxc7 18.Nxc7+ Kf7 19.Qg4 g5 
                       20.Qe6+ Kg7 21.Qf5 Kf7 (4.492.368.874) 2063
_____________________________________________________

45     46:22  +1.61    17.Nxc7+ Kf7 18.Qg4 g5 19.Qe6+ Kg7 
                       20.Qf5 Kg8 21.d6 gxf4 22.d7 Rxc7 
                       23.Rxc7 Qxc7 24.Qd5+ Kg7 25.d8Q Qxd8 
                       26.Qxd8 Kg6 27.Qd1 Bg7 28.Qxa1 f5 
                       29.Qe1 Bf6 30.Qe6 (5.695.823.785) 2047 

45     46:22  +1.52    17.Qg4 Qd7 18.Qe6 Qxe6 19.dxe6 g5 
                       20.Nxc7+ Rxc7 21.Rxc7 Kd8 22.Bg3 f5 
                       23.Rd7+ Kc8 24.Be5 Bg7 25.Bxg7 Rd8 
                       26.Rxd8+ Kxd8 27.Kf1 Nc2 28.Bc3 b5 
                       29.a3 Kc7 30.Ke2 (5.695.823.785) 2047 

45     46:22  +1.04    17.Na7 c5 18.dxc6 Rxc6 19.Nxc6 bxc6 
                       20.Qxc6+ Kf7 21.Be3 Qd6 22.Qxb6 Qxb6 
                       23.Bxb6 Nb3 24.axb3 g5 25.Rc8 Bg7 
                       26.Rxh8 Bxh8 27.b4 f5 28.b3 g4 29.b5 Be5 
                       30.Be3 (5.695.823.785) 2047 

45     46:22  +0.34    17.Qe4 Nc2 18.Qxc2 Qxd5 19.Nxc7+ Rxc7 
                       20.Qxc7 Kf7 21.h4 Rg8 22.a4 g5 
                       23.hxg5 fxg5 24.Be3 Rg6 25.Qc2 Bg7 
                       26.Rd1 Qe6 27.Bd2 g4 28.Re1 Qd5 
                       29.Bb4 Re6 30.Rxe6 (5.695.823.785) 2047 

45     46:22  0.00     17.Rxc7 Rxc7 18.Nxc7+ Kf7 19.Qg4 g5 
                       20.Qe6+ Kg7 21.Qf5 Kf7 (5.695.823.785) 2047
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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peter
Posts: 3185
Joined: Sat Feb 16, 2008 7:38 am
Full name: Peter Martan

Re: interesting position

Post by peter »

Hello Eelco!
Eelco de Groot wrote: ↑Tue Nov 20, 2018 8:02 am Kaissa sees three winning moves now. 17. Na7 can transpose after 17... Ra8 18. Nb5 Rc8 but Kaissa sees a different PV after a while, so that move is not a complete transposition with 17. Nxc7+
Output with 32G hash full after FW-BW and again 17.Qg4(!):

[d]2rqkb1r/1pp1p1pp/1p3p2/1N1P4/5BQ1/8/PP3PPP/n1R3K1 b k - 0 1

Analysis by asmFishWCP_2018-11-18_popcnt:

17...Qd7 18.Qe6 c5 19.Nd6+ Kd8 20.Nxc8 Qxe6 21.dxe6 Kxc8 22.Rc4 g5 23.Bg3 f5 24.Be5 Bg7 25.Bxg7 Rg8 26.Be5 Rg6 27.Rc1 Rxe6 28.Bc3 b5 29.Rxa1 b4 30.Bd2 g4 31.Rc1 Rc6 32.Bf4 Kd7 33.f3 gxf3 34.gxf3 Rc8 35.Kf2 b6 36.Rc2 Kc6 37.Kg3 b5 38.b3 Kd5 39.Rd2+ Kc6 40.Rb2 Rg8+ 41.Kh4 Rd8 42.Kg5 Rd3 43.Kxf5 Rxf3 44.Ke4 Rf1 45.Rc2 Rd1 46.Bd2 Kd6 47.Be3 Rd5 48.Bf4+ Kc6 49.Rc1 Rd7 50.Ke5 Rd5+ 51.Ke6 Rd3 52.Bg5
+- (2.61) Depth: 48/73 00:05:47 10072MN

Same after 17.Nc7+(!?) and a corresponding line:

[d]2rqkb1r/1pN1p1pp/1p3p2/3P4/5B2/5Q2/PP3PPP/n1R3K1 b k - 0 1

Analysis by asmFishWCP_2018-11-18_popcnt:

17...Kf7 18.Qg4 g5 19.Rc3 Rg8 20.Qf5 gxf4 21.Ne6 Qe8 22.Rxc8 Qxc8 23.Ng5+ Rxg5 24.Qxc8 Rxd5 25.Qc1 e6 26.Qxa1 b5 27.Qc1 b4 28.Kf1 f3 29.gxf3 b6 30.Qc7+ Be7 31.Qc4 Bc5 32.Qf4 Bf8 33.Ke2 Ra5 34.Qc7+ Be7 35.Qc4 Rc5 36.Qb3 Re5+ 37.Kf1 Rf5 38.Qe3 Rh5 39.Qf4 h6 40.Ke2 Ra5 41.Qxh6 Rxa2 42.Qh7+ Ke8 43.Qc2 Kf7
+/- (1.48) Depth: 42/69 00:05:22 9139MN

And after 17.Na7(?!) and again new FW-BW:

[d]2rqkb1r/Npp1p1pp/1p3p2/3P4/5B2/5Q2/PP3PPP/n1R3K1 b k - 0 1

Analysis by asmFishWCP_2018-11-18_popcnt:

17...c6 18.dxc6 Rxc6 19.Nxc6 bxc6 20.Qxc6+ Kf7 21.Be3 Qd6 22.Qxb6 Qxb6 23.Bxb6 Nb3 24.axb3 g5 25.Rc8 g4 26.Bd4 Bg7 27.Rxh8 Bxh8 28.b4 e5 29.Bc5 Ke6 30.b5 Kd5 31.b4 f5 32.h3 gxh3 33.g3 e4 34.Kh2 Be5 35.Kxh3 Bf6 36.Kg2 Be5 37.Kh2 Bg7 38.Kg1 Bf6 39.Kf1 Bb2 40.Ke2 Be5 41.Ke3 Bb8 42.b6 Be5 43.b7 Kc6
+/- (1.06) Depth: 45/65 00:04:23 7191MN
Peter.
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Vinvin
Posts: 5228
Joined: Thu Mar 09, 2006 9:40 am
Full name: Vincent Lejeune

Re: interesting position

Post by Vinvin »

IMHO, the scores are too much close to make a good test position :

Stockfish_18110421_x64_modern:

Code: Select all

 44/74	05:09	3 076 271 679	9 946 204	+2,52	17.Nxc7+ Kf7 18.Qg4 g5 19.Qe6+ Kg7 20.Qf5 Kg8 21.d6 gxf4 22.d7 Rxc7 23.Rxc7 Qxc7 24.Qd5+ e6 25.d8Q Qxd8 26.Qxd8 Kf7 27.Qd1 Be7 28.Qxa1 Rc8 29.Qd1 Rc5 30.a3 Rd5 31.Qc2 f5 32.Kf1 b5 33.b4 h5 34.Qe2 h4 35.Qh5+ Kf8 36.Qh6+ Kf7 37.Ke2 Re5+ 38.Kf3 Rd5 39.Qh5+ Kg7 40.Qe8 Kf6 41.Ke2 Re5+ 42.Kd2 Rd5+ 43.Kc2 b6 44.Qg8 Bd8 45.Qh7 Ke5 46.Qh8+ Bf6 47.Qb8+ Rd6 48.Qe8 Rd5 49.f3 Kd6 50.Qb8+ Ke7 51.Qxb6 Re5
 45/68	05:09	3 076 271 679	9 946 204	+2,66	17.Qg4 c5 18.Qe6 Qd7 19.Nd6+ Kd8 20.Nxc8 Qxe6 21.dxe6 Kxc8 22.Rc4 g5 23.Bg3 f5 24.Be5 Bg7 25.Bxg7 Rg8 26.Be5 Rg6 27.Rc1 Rxe6 28.Bc3 b5 29.Rxa1 b4 30.Bd2 g4 31.Rc1 Rc6 32.h3 gxh3 33.Be3 b6 34.g3 Kd7 35.Kh2 Rc8 36.b3 Kd6 37.Kxh3 Kd5 38.Kh4 Ke4 39.Re1 Kd3 40.Rd1+ Ke4 41.Bg5 e5 42.Re1+ Kd5 43.Be3 b5
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Vinvin
Posts: 5228
Joined: Thu Mar 09, 2006 9:40 am
Full name: Vincent Lejeune

Re: interesting position

Post by Vinvin »

Vinvin wrote: ↑Tue Nov 20, 2018 3:26 pm IMHO, the scores are too much close to make a good test position :

Stockfish_18110421_x64_modern:

Code: Select all

 44/74	05:09	3 076 271 679	9 946 204	+2,52	17.Nxc7+ Kf7 18.Qg4 g5 19.Qe6+ Kg7 20.Qf5 Kg8 21.d6 gxf4 22.d7 Rxc7 23.Rxc7 Qxc7 24.Qd5+ e6 25.d8Q Qxd8 26.Qxd8 Kf7 27.Qd1 Be7 28.Qxa1 Rc8 29.Qd1 Rc5 30.a3 Rd5 31.Qc2 f5 32.Kf1 b5 33.b4 h5 34.Qe2 h4 35.Qh5+ Kf8 36.Qh6+ Kf7 37.Ke2 Re5+ 38.Kf3 Rd5 39.Qh5+ Kg7 40.Qe8 Kf6 41.Ke2 Re5+ 42.Kd2 Rd5+ 43.Kc2 b6 44.Qg8 Bd8 45.Qh7 Ke5 46.Qh8+ Bf6 47.Qb8+ Rd6 48.Qe8 Rd5 49.f3 Kd6 50.Qb8+ Ke7 51.Qxb6 Re5
 45/68	05:09	3 076 271 679	9 946 204	+2,66	17.Qg4 c5 18.Qe6 Qd7 19.Nd6+ Kd8 20.Nxc8 Qxe6 21.dxe6 Kxc8 22.Rc4 g5 23.Bg3 f5 24.Be5 Bg7 25.Bxg7 Rg8 26.Be5 Rg6 27.Rc1 Rxe6 28.Bc3 b5 29.Rxa1 b4 30.Bd2 g4 31.Rc1 Rc6 32.h3 gxh3 33.Be3 b6 34.g3 Kd7 35.Kh2 Rc8 36.b3 Kd6 37.Kxh3 Kd5 38.Kh4 Ke4 39.Re1 Kd3 40.Rd1+ Ke4 41.Bg5 e5 42.Re1+ Kd5 43.Be3 b5
With a a bit of learning, Nxc7+ drops by 1 pawn !

Code: Select all

 45/75	04:03	2 314 358 495	9 506 465	+1,46	17.Nxc7+ Kf7 18.Qg4 g5 19.Qe6+ Kg6 20.Rc3 h5 21.Qe4+ Kf7 22.Qf5 Bh6 23.h4 Rxc7 24.Rxc7 gxf4 25.Rd7 Qe8 26.Qe6+ Kg6 27.Rxe7 Qf8 28.Qe4+ f5 29.Qe6+ Qf6 30.Qd7 Bg7 31.Re6 Nc2 32.Qxb7 Rd8 33.Rxf6+ Bxf6 34.a4 Nd4 35.Qxb6 Rxd5 36.a5 Rb5 37.Qc7 Rxb2 38.a6 Ra2 39.Qb6 f3 40.a7 Ra1+ 41.Kh2 fxg2 42.Kxg2 Nb5 43.Qxb5 Rxa7 44.Qe8+ Kg7 45.Kg3 Rf7 46.f3 Kg6 47.Kh3 Kg7 48.Qb5 Kg6 49.Qd3 Re7 50.Qd5 Re1 51.Qg8+ Kh6
 46/66	04:03	2 314 358 495	9 506 465	+2,63	17.Qg4 c5 18.Qe6 Qd7 19.Nd6+ Kd8 20.Nxc8 Qxe6 21.dxe6 Kxc8 22.Rc4 g5 23.Bg3 f5 24.Be5 Bg7 25.Bxg7 Rg8 26.Be5 Rg6 27.Rc1 Rxe6 28.Bc3 b5 29.Rxa1 b4 30.Bd2 g4 31.Rc1 Rc6 32.h3 gxh3 33.Be3 b6 34.g3 Kd7 35.Kh2 Rc8 36.b3 e5 37.Kxh3 Ke6 38.Kh4 Rf8 39.Re1 Kd5 40.Kg5 h6+ 41.Kxh6 f4 42.gxf4 exf4 43.Bc1 Ra8 44.Re2 f3 45.Rc2 Ke4 46.Kg5 Kd3 47.Rd2+ Ke4 48.Kf6 Rf8+ 49.Ke6 Ra8
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Eelco de Groot
Posts: 4561
Joined: Sun Mar 12, 2006 2:40 am
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Re: interesting position

Post by Eelco de Groot »

Vinvin wrote: ↑Tue Nov 20, 2018 4:11 pm
Vinvin wrote: ↑Tue Nov 20, 2018 3:26 pm IMHO, the scores are too much close to make a good test position :

Stockfish_18110421_x64_modern:

Code: Select all

 44/74	05:09	3 076 271 679	9 946 204	+2,52	17.Nxc7+ Kf7 18.Qg4 g5 19.Qe6+ Kg7 20.Qf5 Kg8 21.d6 gxf4 22.d7 Rxc7 23.Rxc7 Qxc7 24.Qd5+ e6 25.d8Q Qxd8 26.Qxd8 Kf7 27.Qd1 Be7 28.Qxa1 Rc8 29.Qd1 Rc5 30.a3 Rd5 31.Qc2 f5 32.Kf1 b5 33.b4 h5 34.Qe2 h4 35.Qh5+ Kf8 36.Qh6+ Kf7 37.Ke2 Re5+ 38.Kf3 Rd5 39.Qh5+ Kg7 40.Qe8 Kf6 41.Ke2 Re5+ 42.Kd2 Rd5+ 43.Kc2 b6 44.Qg8 Bd8 45.Qh7 Ke5 46.Qh8+ Bf6 47.Qb8+ Rd6 48.Qe8 Rd5 49.f3 Kd6 50.Qb8+ Ke7 51.Qxb6 Re5
 45/68	05:09	3 076 271 679	9 946 204	+2,66	17.Qg4 c5 18.Qe6 Qd7 19.Nd6+ Kd8 20.Nxc8 Qxe6 21.dxe6 Kxc8 22.Rc4 g5 23.Bg3 f5 24.Be5 Bg7 25.Bxg7 Rg8 26.Be5 Rg6 27.Rc1 Rxe6 28.Bc3 b5 29.Rxa1 b4 30.Bd2 g4 31.Rc1 Rc6 32.h3 gxh3 33.Be3 b6 34.g3 Kd7 35.Kh2 Rc8 36.b3 Kd6 37.Kxh3 Kd5 38.Kh4 Ke4 39.Re1 Kd3 40.Rd1+ Ke4 41.Bg5 e5 42.Re1+ Kd5 43.Be3 b5
With a a bit of learning, Nxc7+ drops by 1 pawn !

Code: Select all

 45/75	04:03	2 314 358 495	9 506 465	+1,46	17.Nxc7+ Kf7 18.Qg4 g5 19.Qe6+ Kg6 20.Rc3 h5 21.Qe4+ Kf7 22.Qf5 Bh6 23.h4 Rxc7 24.Rxc7 gxf4 25.Rd7 Qe8 26.Qe6+ Kg6 27.Rxe7 Qf8 28.Qe4+ f5 29.Qe6+ Qf6 30.Qd7 Bg7 31.Re6 Nc2 32.Qxb7 Rd8 33.Rxf6+ Bxf6 34.a4 Nd4 35.Qxb6 Rxd5 36.a5 Rb5 37.Qc7 Rxb2 38.a6 Ra2 39.Qb6 f3 40.a7 Ra1+ 41.Kh2 fxg2 42.Kxg2 Nb5 43.Qxb5 Rxa7 44.Qe8+ Kg7 45.Kg3 Rf7 46.f3 Kg6 47.Kh3 Kg7 48.Qb5 Kg6 49.Qd3 Re7 50.Qd5 Re1 51.Qg8+ Kh6
 46/66	04:03	2 314 358 495	9 506 465	+2,63	17.Qg4 c5 18.Qe6 Qd7 19.Nd6+ Kd8 20.Nxc8 Qxe6 21.dxe6 Kxc8 22.Rc4 g5 23.Bg3 f5 24.Be5 Bg7 25.Bxg7 Rg8 26.Be5 Rg6 27.Rc1 Rxe6 28.Bc3 b5 29.Rxa1 b4 30.Bd2 g4 31.Rc1 Rc6 32.h3 gxh3 33.Be3 b6 34.g3 Kd7 35.Kh2 Rc8 36.b3 e5 37.Kxh3 Ke6 38.Kh4 Rf8 39.Re1 Kd5 40.Kg5 h6+ 41.Kxh6 f4 42.gxf4 exf4 43.Bc1 Ra8 44.Re2 f3 45.Rc2 Ke4 46.Kg5 Kd3 47.Rd2+ Ke4 48.Kf6 Rf8+ 49.Ke6 Ra8
I think it might still be winning, although Kaissa has done no learning, with version 043 three moves still look good, depth 63 :)

Code: Select all

2rqkb1r/1pp1p1pp/1p3p2/1N1P4/5B2/5Q2/PP3PPP/n1R3K1 w k -

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

63     2883:48+2.65    17.Nxc7+ Kf7 18.Qg4 g5 19.Qe6+ Kg7 
                       20.Qf5 Kg8 21.d6 gxf4 22.d7 Rxc7 
                       23.Rxc7 Qxc7 24.Qd5+ e6 25.d8Q Qxd8 
                       26.Qxd8 Kf7 27.Qd1 Be7 28.Qxa1 Rc8 
                       29.Qd1 Rc5 30.a3 (316.078.975.985) 1826 

63     2883:48+2.52    17.Qg4 Qd7 18.Qe6 c5 19.Nd6+ Kd8 
                       20.Nxc8 Qxe6 21.dxe6 Kxc8 22.Rc4 g5 
                       23.Bg3 f5 24.Be5 Bg7 25.Bxg7 Rg8 
                       26.Be5 Rg6 27.Rc1 Rxe6 28.Bc3 b5 
                       29.Rxa1 b4 30.Bd2 (316.078.975.985) 1826 

62     2883:48+1.36    17.Na7 c6 18.dxc6 Rxc6 19.Nxc6 bxc6 
                       20.Qxc6+ Kf7 21.Be3 Qd6 22.Qxb6 Qxb6 
                       23.Bxb6 Nb3 24.axb3 e5 25.Rc8 Rg8 
                       26.Kf1 f5 27.Ke2 e4 28.h3 g5 29.Ba5 Be7 
                       30.Rxg8 (316.078.975.985) 1826 

62     2883:48+0.23    17.Qe4 e5 18.dxe6 c6 19.Na7 Be7 
                       20.Nxc8 Qxc8 21.Rxa1 O-O 22.Bd2 Rd8 
                       23.Bc3 b5 24.a3 c5 25.h4 Qc6 26.Qg4 Rd5 
                       27.Re1 Kh8 28.Re3 Qd6 29.g3 Kg8 
                       30.Kh2 (316.078.975.985) 1826 

62     2883:480.00     17.Rxc7 Rxc7 18.Nxc7+ Kf7 19.Qh3 Nc2 
                       20.Qe6+ Kg6 21.Qe4+ Kf7 (316.078.975.985) 1826
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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