Nice study by Troitsky

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acase
Posts: 1002
Joined: Wed Mar 15, 2006 1:14 am
Location: Columbus, Ohio USA
Full name: Andrew R Case

Nice study by Troitsky

Post by acase »

This one is from 1912, white to play and win:

[pgn][Event "Troitzky=A - (+0041.13c7c3), .hm Sydsvenska Dagbladet Snällposten,"]
[Site "WORKSTATION-PC"]
[Date "1912"]
[Round "?"]
[White "workstation"]
[Black "Workstation"]
[Result "*"]
[BlackElo "0"]
[Time "16:59:33"]
[WhiteElo "0"]
[TimeControl "0"]
[SetUp "1"]
[FEN "8/2K1p1p1/4b3/7P/6p1/2k5/6N1/6B1 w - - 0 1"]
[Termination "unterminated"]
[PlyCount "4"]
[WhiteType "human"]
[BlackType "human"][/pgn]
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acase
Posts: 1002
Joined: Wed Mar 15, 2006 1:14 am
Location: Columbus, Ohio USA
Full name: Andrew R Case

Re: Nice study by Troitsky

Post by acase »

Sorry, But I didn't have the full PGN, I had to build it by hand. The strange thing about this study is that it seems to trip up Stockfish, Blue Marlin, and Crystal 5 KWK (getting stuck on 1.Nf4) , however if you disable the NNUE in those engines they seem to get it. The fastest engines I tried out were Komodo 14.1, Berserk 11.1, Arasan 23.4, and Rebel 16.2.

Anyways here's the full PGN:

[pgn][Event "Troitzky=A - (+0041.13c7c3), .hm Sydsvenska Dagbladet Snällposten,"]
[Site "WORKSTATION-PC"]
[Date "1912"]
[Round "?"]
[White "workstation"]
[Black "Workstation"]
[Result "*"]
[BlackElo "0"]
[Time "16:59:33"]
[WhiteElo "0"]
[TimeControl "0"]
[SetUp "1"]
[FEN "8/2K1p1p1/4b3/7P/6p1/2k5/6N1/6B1 w - - 0 1"]
[Termination "unterminated"]
[PlyCount "4"]
[WhiteType "human"]
[BlackType "human"]

1. Kd8 Bf7 2. Kxe7 Bxh5 3. Nf4 g6 4. Ne2+ Kc4 5. Ng3
Kd5 6. Kd7 Ke5 7. Be3 Kd5 8. Kc7 Ke6 9. Kc6 Ke5 10.
Kc5 Ke6 11. Bd4 Kd7 (11... Ke7 12. Kd5 Kd7 13. Be5)
12. Kd5 Ke7 (12... Kc7 13. Bc5 Kd7 14. Bd6) 13. Be5
Kd7 14. Bd6 $1 14... Ke8 ( 14... Kc8 15. Kc6 Kd8 16.
Bc5 Ke8 17. Kd6 Kf7 (17... Kd8 18. Bb6+) 18. Bd4) (
14... Kd8 15. Ke6 Kc8 16. Be5 Kb7 (16... Kd8 17. Kd6)
17. Kd6 Kb6 18. Bd4+ Kb5 (18... Kb7 19. Kd7 Ka6 20.
Kc6) 19. Kd5 Kb4 20. Bb6 Kb5 (20... Kc3 21. Kc5) 21.
Bc5) 15. Ke6 Kd8 16. Be5 Kc8 17. Kd6 Kb7 (17... Kd8
18. Bf6+) 18. Bd4 Ka6 ( 18... Kc8 19. Kc6 Kd8 20. Bf6+)
19. Kc6 Ka5 20. Bc3+ Ka4 21. Kc5 Kb3 22. Kd4 Kc2 (22...
Ka4 23. Kc4 Ka3 24. Ba5 Kb2 (24... Ka2 25. Kc3 Ka3 26.
Bb4+) 25. Bb4 Kc2 26. Bc3 Kc1 27. Kd3) 23. Kc4 Kd1 (23...
Kb1 24. Kb3 Kc1 25. Ba5 Kb1 26. Bd2 Ka1 27. Bc3+ Kb1
28. Bb2) 24. Kb3 Kc1 25. Ba5 Kd1 26. Bb4 Kc1 27. Kc3
Kb1 ( 27... Kd1 28. Kb2) 28. Ba3 Ka2 29. Bb2 Kb1 30.
Kb3 g5 31. Nxh5 1-0 *[/pgn]
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Chessqueen
Posts: 5685
Joined: Wed Sep 05, 2018 2:16 am
Location: Moving
Full name: Jorge Picado

Re: Nice study by Troitsky

Post by Chessqueen »

If you simply let Dragon vs Stockfish play it out they both solve it :roll:
[pgn][Event "Computer chess game"]
[Site "DESKTOP-OFQ3C0P"]
[Date "2023.03.25"]
[Round "?"]
[White "Dragon-3.2-64bit-avx2"]
[Black "Stockfish_23031407_x64_avx2"]
[Result "1-0"]
[BlackElo "3429"]
[Time "19:02:25"]
[WhiteElo "3535"]
[TimeControl "1800+10"]
[SetUp "1"]
[FEN "8/2K1p1p1/4b3/7P/6p1/2k5/6N1/6B1 w - - 0 1"]
[Termination "normal"]
[PlyCount "32"]
[WhiteType "program"]
[BlackType "program"]

1. Kd8 Bf7 2. Kxe7 Bxh5 3. Nf4 Bg6 4. Nxg6 Kd3 5. Ke6 Ke2 6. Bc5 g3 7. Nf4+
Kf1 8. Nh3 g5 9. Ng1 g4 10. Kf5 Ke1 11. Ke4 Kf1 12. Kd3 Kg2 13. Ke2 Kh2 14.
Kf1 Kh1 15. Bb6 Kh2 16. Bd4 Kh1 {Black resigns} *[/pgn]
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acase
Posts: 1002
Joined: Wed Mar 15, 2006 1:14 am
Location: Columbus, Ohio USA
Full name: Andrew R Case

Re: Nice study by Troitsky

Post by acase »

Chessqueen wrote: ↑Sun Mar 26, 2023 1:24 am If you simply let Dragon vs Stockfish play it out they both solve it :roll:
[pgn][Event "Computer chess game"]
[Site "DESKTOP-OFQ3C0P"]
[Date "2023.03.25"]
[Round "?"]
[White "Dragon-3.2-64bit-avx2"]
[Black "Stockfish_23031407_x64_avx2"]
[Result "1-0"]
[BlackElo "3429"]
[Time "19:02:25"]
[WhiteElo "3535"]
[TimeControl "1800+10"]
[SetUp "1"]
[FEN "8/2K1p1p1/4b3/7P/6p1/2k5/6N1/6B1 w - - 0 1"]
[Termination "normal"]
[PlyCount "32"]
[WhiteType "program"]
[BlackType "program"]

1. Kd8 Bf7 2. Kxe7 Bxh5 3. Nf4 Bg6 4. Nxg6 Kd3 5. Ke6 Ke2 6. Bc5 g3 7. Nf4+
Kf1 8. Nh3 g5 9. Ng1 g4 10. Kf5 Ke1 11. Ke4 Kf1 12. Kd3 Kg2 13. Ke2 Kh2 14.
Kf1 Kh1 15. Bb6 Kh2 16. Bd4 Kh1 {Black resigns} *[/pgn]
Let Stockfish or Crystal play the white pieces, also give this easy to solve for engines study to Crystal and see what happens, for some strange reason it seems to freeze Crystal's search immediately.

[pgn][[Event "Gerd Horning study"]
[Site "WORKSTATION-PC"]
[Date "2023.03.25"]
[Round "?"]
[White "ShashChess30-x86-64-bmi2"]
[Black "Stockfish_23022721_x64_bmi2"]
[Result "*"]
[BlackElo "2000"]
[Time "22:21:08"]
[WhiteElo "2000"]
[TimeControl "2700+15"]
[SetUp "1"]
[FEN "k7/pp6/8/P6p/8/P6p/P2K3B/8 w - - 0 1"]
[Termination "normal"]
[PlyCount "57"]
[WhiteType "program"]
[BlackType "program"]

1. a4 {+M29/78 67 Stockfish_10_x64_bmi2} b6 2. a6 b5 3. a5 h4 4. Ke3 b4 5.
Kf4 Kb8 6. Kf3+ Ka8 7. Bc7 h2 8. Bxh2 h3 9. Kg3 Kb8 10. Kxh3+ Ka8 11. Bg1
Kb8 12. Kg4 Ka8 13. Kf4 Kb8 14. Ke5 Ka8 15. Kd6 Kb8 16. Bb6 Ka8 17. Kc7 b3
18. axb3 axb6 19. Kxb6 Kb8 20. b4 Ka8 21. b5 Kb8 22. Kc6 Kc8 23. a7 Kd8 24.
Kd6 Ke8 25. Ke6 Kf8 26. a8=Q+ Kg7 27. Qg2+ Kh6 28. Kf6 Kh5 29. Qg5# *[/pgn]
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Chessqueen
Posts: 5685
Joined: Wed Sep 05, 2018 2:16 am
Location: Moving
Full name: Jorge Picado

Re: Nice study by Troitsky

Post by Chessqueen »

I do NOT believe that Stockfish can win this game playing at this time control of 15 Min + 10 sec increment :roll:

[pgn][Event "Computer chess game"]
[Site "DESKTOP-OFQ3C0P"]
[Date "2023.03.25"]
[Round "?"]
[White "Dragon-3.2-64bit-avx2"]
[Black "Dragon-3.2-64bit-avx2"]
[Result "1/2-1/2"]
[BlackElo "3529"]
[Time "21:16:35"]
[WhiteElo "3520"]
[TimeControl "900+10"]
[SetUp "1"]
[FEN "8/2K1p1p1/4b3/7P/6p1/2k5/6N1/6B1 w - - 0 1"]
[Termination "normal"]
[PlyCount "268"]
[WhiteType "program"]
[BlackType "program"]

1. Kd8 Bf7 2. Kxe7 Bxh5 3. Nf4 g6 4. Ne2+ Kc4 5. Ng3 Kd5 6. Kd7 Ke5 7. Be3
Kd5 8. Bg5 Kc5 9. Bd2 Kb5 10. Kd6 Kc4 11. Be3 Kd3 12. Bf2 Kd2 13. Bd4 Kc1
14. Kc5 Kc2 15. Kc4 Kd2 16. Bf2 Kc2 17. Be3 Kb2 18. Kd5 Kb3 19. Ke4 Kc2 20.
Bg1 Kb2 21. Bd4+ Kb1 22. Kd5 Kc2 23. Kc6 Kd1 24. Bf2 Kc2 25. Bg1 Kd1 26.
Bb6 Kc2 27. Kb5 Kb3 28. Be3 Kc2 29. Kb4 Kd3 30. Bc5 Kd2 31. Kc4 Kd1 32. Kd3
Kc1 33. Kc3 Kd1 34. Bf2 Kc1 35. Bd4 Kd1 36. Be3 g5 37. Nxh5 Ke2 38. Kd4 Kf3
39. Ng7 Kg2 40. Ke4 Kh1 41. Nf5 g3 42. Nxg3+ Kg2 43. Ne2 Kf1 44. Kd3 Kg2
45. Bc5 Kh3 46. Kd2 Kg2 47. Ke3 g4 48. Ke4 Kh3 49. Kd3 Kg2 50. Ke3 Kf1 51.
Ba7 Kg2 52. Bb8 Kh1 53. Ba7 Kg2 54. Bb6 Kf1 55. Ng3+ Kg2 56. Bc7 Kg1 57.
Kd3 Kh2 58. Ne2+ Kh3 59. Bb6 Kg2 60. Bd4 Kf3 61. Ng1+ Kg2 62. Kc3 Kf1 63.
Kd2 Kg2 64. Ke2 Kg3 65. Ke3 Kg2 66. Kd3 Kf1 67. Bc5 Kg2 68. Ne2 Kh3 69. Bd4
Kg2 70. Be5 Kf1 71. Bb8 Kg2 72. Bf4 Kf2 73. Bg3+ Kf3 74. Be5 Kg2 75. Ng3
Kf2 76. Ke4 Kg2 77. Kd5 Kh2 78. Bd6 Kg2 79. Kd4 Kf2 80. Bc7 Kg2 81. Bb8 Kf2
82. Be5 Kg1 83. Ke3 Kg2 84. Ke2 Kg1 85. Bd4+ Kg2 86. Nf5 Kh1 87. Nh4 Kh2
88. Kf2 g3+ 89. Ke2 g2 90. Nf3+ Kg3 91. Ng1 Kf4 92. Kd3 Kf5 93. Kc4 Ke6 94.
Kc5 Ke7 95. Kc6 Kd8 96. Bf6+ Kc8 97. Be5 Kd8 98. Bh2 Ke7 99. Kc7 Ke6 100.
Bd6 Kf5 101. Bc5 Ke5 102. Kd8 Kf5 103. Kc8 Ke4 104. Bb4 Kd5 105. Kc7 Ke6
106. Kc6 Ke5 107. Bc3+ Ke6 108. Bd4 Ke7 109. Be3 Kd8 110. Kd6 Kc8 111. Bg5
Kb7 112. Bh4 Kc8 113. Kc6 Kb8 114. Bg3+ Kc8 115. Bf2 Kb8 116. Kb6 Kc8 117.
Bc5 Kb8 118. Bf8 Ka8 119. Kc7 Ka7 120. Kc6 Kb8 121. Bg7 Kc8 122. Bb2 Kb8
123. Bd4 Kc8 124. Bc5 Kb8 125. Bd6+ Ka7 126. Kb5 Kb7 127. Bh2 Ka8 128. Kc6
Ka7 129. Nh3 Ka8 130. Bg1 Kb8 131. Nf4 Kc8 132. Nxg2 Kb8 133. Nf4 Ka8 134.
Ne6 Kb8 {Black resigns} *[/pgn]
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Jouni
Posts: 3758
Joined: Wed Mar 08, 2006 8:15 pm
Full name: Jouni Uski

Re: Nice study by Troitsky

Post by Jouni »

In first one SF dev sees win in 2 minutes:

1.Kd8 Bf7 2.Kxe7 Bxh5 3.Nf4 g6 4.Ne2+ Kc4 5.Ng3 Kd5 6.Ba7 Ke5 7.Be3 Kd5 8.Bg5 Ke5 9.Bh6 Kd5 10.Bg7 Kc5 11.Ke6 Kc6 12.Bf8 Kc7 13.Kd5 Kb7 14.Bg7 Kb6 15.Be5 Kb5 16.Bd4 Kb4 17.Be3 Kb5 18.Bc5 Ka5 19.Kc6 Ka4 20.Bb6 Kb4 21.Bf2 Kc4 22.Bc5 Kc3 23.Kb5 Kd3 24.Kb4 Kd2 25.Ba7 Kc2 26.Kc4 Kb2 27.Bd4+ Ka3 28.Bc3 Ka2 29.Bd2 Ka3 30.Ba5 Kb2 31.Bb4 Kc2
+- (199.13) Depth: 58/66 00:02:01 1251mN, tb=8016571

After 2 moves 7 piece syzygy says white is winning DTZ 2. Not very informative at all :lol: .
Jouni
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Eelco de Groot
Posts: 4692
Joined: Sun Mar 12, 2006 2:40 am
Full name:   Eelco de Groot

Re: Nice study by Troitsky

Post by Eelco de Groot »

If you give Crystal 5 KWK the first two plies, it still does not see a win. Strange. But no tablebases used here.

1.Kd8 Bf7


[fen]3K4/4pbp1/8/7P/6p1/2k5/6N1/6B1 w - -[/fen]

Code: Select all

3K4/4pbp1/8/7P/6p1/2k5/6N1/6B1 w - -

Engine: Crystal 5 KWK (512 MB)
gemaakt door the Stockfish developers (see AUTHORS f

20/22  0:01   0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (2.376.803) 1303 

21/22  0:02   0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (2.658.174) 1304 

22/22  0:02   0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (3.020.569) 1309 

23/22  0:02   0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (3.296.996) 1302 

24/22  0:02   0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (3.727.097) 1303 

25/22  0:03   0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (4.290.700) 1309 

26/22  0:03   0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (4.624.302) 1305 

27/22  0:03   0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (5.176.727) 1304 

28/22  0:04   0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (6.016.908) 1311 

29/22  0:05   0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (6.899.260) 1311 

30/22  0:06   0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (8.868.855) 1340 

31/22  0:07   0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (9.850.503) 1323 

32/22  0:08   0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (11.176.011) 1327 

33/22  0:09   0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (12.872.307) 1336 

34/22  0:12   0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (16.605.303) 1368 

35/22  0:13   0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (19.245.712) 1378 

36/22  0:15   0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (20.997.268) 1379 

37/22  0:18   0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (25.783.327) 1403 

38/22  0:21   0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (31.030.969) 1421 

39/22  0:26   0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (38.148.442) 1450 

40/22  0:31   0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (45.784.880) 1472 

41/22  0:38   0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (58.238.185) 1511 

42/22  0:45   0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (70.012.896) 1530 

43/22  1:00   0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (95.834.449) 1592 

44/22  1:19   0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (131.221.020) 1654 

45/22  1:27   0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (144.600.064) 1661 

46/22  1:53   0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (195.000.937) 1714 

47/22  2:20   0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (242.703.576) 1728 

48/22  3:32   0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (379.801.816) 1790 

49/22  4:17   0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (467.311.732) 1815 

50/22  7:22   0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (835.940.237) 1889 

51/22  8:32   0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (984.359.776) 1920 

52/22  11:44  0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (1.369.353.388) 1943 

53/22  17:54  0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (2.114.232.902) 1966 

54/22  20:52  0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (2.453.782.521) 1958 

55/22  25:18  0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (3.028.492.009) 1994 

56/22  38:51  0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pe4+ Kd1 11.Pc3+ Kd2 (4.634.134.518) 1987 

57/40  50:45  0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pxe2 Kxe2 11.Lg3 Kf3 12.Ld6 g3 
                       13.Kf5 Ke2 14.Lxg3 Kf3 15.Kxg5 (6.203.789.740) 2037 

58/38  64:34  0.00     2.Pf4 e5 3.Pe2+ Kd3 4.Pg3 e4 5.Ke7 Lxh5 
                       6.Pxh5 g5 7.Ke6 e3 8.Pg3 e2 9.Lf2 Kd2 
                       10.Pxe2 Kxe2 11.Lc5 g3 12.Kf6 g2 
                       13.Ke5 Kf1 14.Kf5 g1D 15.Lxg1 (7.984.224.924) 2060
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
acase
Posts: 1002
Joined: Wed Mar 15, 2006 1:14 am
Location: Columbus, Ohio USA
Full name: Andrew R Case

Re: Nice study by Troitsky

Post by acase »

Jouni wrote: ↑Sun Mar 26, 2023 4:48 pm In first one SF dev sees win in 2 minutes:

1.Kd8 Bf7 2.Kxe7 Bxh5 3.Nf4 g6 4.Ne2+ Kc4 5.Ng3 Kd5 6.Ba7 Ke5 7.Be3 Kd5 8.Bg5 Ke5 9.Bh6 Kd5 10.Bg7 Kc5 11.Ke6 Kc6 12.Bf8 Kc7 13.Kd5 Kb7 14.Bg7 Kb6 15.Be5 Kb5 16.Bd4 Kb4 17.Be3 Kb5 18.Bc5 Ka5 19.Kc6 Ka4 20.Bb6 Kb4 21.Bf2 Kc4 22.Bc5 Kc3 23.Kb5 Kd3 24.Kb4 Kd2 25.Ba7 Kc2 26.Kc4 Kb2 27.Bd4+ Ka3 28.Bc3 Ka2 29.Bd2 Ka3 30.Ba5 Kb2 31.Bb4 Kc2
+- (199.13) Depth: 58/66 00:02:01 1251mN, tb=8016571

After 2 moves 7 piece syzygy says white is winning DTZ 2. Not very informative at all :lol: .
Perhaps your engines will find this one a little more challenging, I worked on it at my job during my lunch.

Give this one a try :wink:
White to play and win
[pgn][Event "Computer chess game"]
[Site "WORKSTATION-PC"]
[Date "2023.03.29"]
[Round "?"]
[White "Stockfish"]
[Black "Stockfish"]
[Result "*"]
[BlackElo "2000"]
[Time "22:14:41"]
[WhiteElo "3600"]
[TimeControl "none"]
[SetUp "1"]
[FEN "RQN2nqr/2p5/1bb1r3/1p3p1p/pPp1pPkP/P1PpR3/3P4/KBB1N3 w - - 0 1"]
[Termination "unterminated"]
[PlyCount "0"]
[WhiteType "human"]
[BlackType "human"]

*[/pgn]
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User avatar
Eelco de Groot
Posts: 4692
Joined: Sun Mar 12, 2006 2:40 am
Full name:   Eelco de Groot

Re: Nice study by Troitsky

Post by Eelco de Groot »

acase wrote: ↑Thu Mar 30, 2023 4:37 am
Jouni wrote: ↑Sun Mar 26, 2023 4:48 pm In first one SF dev sees win in 2 minutes:

1.Kd8 Bf7 2.Kxe7 Bxh5 3.Nf4 g6 4.Ne2+ Kc4 5.Ng3 Kd5 6.Ba7 Ke5 7.Be3 Kd5 8.Bg5 Ke5 9.Bh6 Kd5 10.Bg7 Kc5 11.Ke6 Kc6 12.Bf8 Kc7 13.Kd5 Kb7 14.Bg7 Kb6 15.Be5 Kb5 16.Bd4 Kb4 17.Be3 Kb5 18.Bc5 Ka5 19.Kc6 Ka4 20.Bb6 Kb4 21.Bf2 Kc4 22.Bc5 Kc3 23.Kb5 Kd3 24.Kb4 Kd2 25.Ba7 Kc2 26.Kc4 Kb2 27.Bd4+ Ka3 28.Bc3 Ka2 29.Bd2 Ka3 30.Ba5 Kb2 31.Bb4 Kc2
+- (199.13) Depth: 58/66 00:02:01 1251mN, tb=8016571

After 2 moves 7 piece syzygy says white is winning DTZ 2. Not very informative at all :lol: .
Perhaps your engines will find this one a little more challenging, I worked on it at my job during my lunch.

Give this one a try :wink:
White to play and win
[pgn][Event "Computer chess game"]
[Site "WORKSTATION-PC"]
[Date "2023.03.29"]
[Round "?"]
[White "Stockfish"]
[Black "Stockfish"]
[Result "*"]
[BlackElo "2000"]
[Time "22:14:41"]
[WhiteElo "3600"]
[TimeControl "none"]
[SetUp "1"]
[FEN "RQN2nqr/2p5/1bb1r3/1p3p1p/pPp1pPkP/P1PpR3/3P4/KBB1N3 w - - 0 1"]
[Termination "unterminated"]
[PlyCount "0"]
[WhiteType "human"]
[BlackType "human"]

*[/pgn]
I let Crystal 5 calculate for an hour (no tablebases) but it does not see anyhing so far, not even a draw. This is Crystal with a NNUE that I borrowed from the Stockfish developers, not committed. But I don't think that would make big differences, don't know.


[fen]RQN2nqr/2p5/1bb1r3/1p3p1p/pPp1pPkP/P1PpR3/3P4/KBB1N3 w - -[/fen]

Code: Select all

RQN2nqr/2p5/1bb1r3/1p3p1p/pPp1pPkP/P1PpR3/3P4/KBB1N3 w - -

Engine: Crystal 5 KWK NNUE II (512 MB)
gemaakt door the Stockfish developers (see AUTHORS f

13/21  0:01   +0.35    1.Pxb6 Dh7 2.Dd8 Tg8 3.Lxd3 cxd3 
                       4.Pd5 Lxa8 5.Dxa8 Dg7 6.Kb1 Df7 
                       7.Pxd3 exd3 (1.258.680) 799 

14/27  0:02   +0.18    1.Pxb6 cxb6 2.Lc2 dxc2 3.Pxc2 Lxa8 
                       4.Te1 Pg6 5.Pe3+ Kf3 6.Tf1+ Kg3 
                       7.Dc7 Pxh4 8.Tg1+ Kf3 9.Tf1+ (1.675.093) 796 

15/28  0:02   0.00     1.Pxb6 cxb6 2.Lc2 dxc2 3.Pxc2 Lxa8 
                       4.Te1 Pg6 5.Pe3+ Kf3 6.Tf1+ Kg3 
                       7.Tg1+ Kh3 8.Th1+ Kg3 (1.786.454) 794 

16/32  0:03   +0.19++  1.Pxb6 (2.460.494) 785 

16/32  0:03   +0.09    1.Pxb6 cxb6 2.Pg2 Lxa8 3.Lc2 dxc2 
                       4.Te1 Kh3 5.Pe3 Dg6 6.Dxa8 Td6 7.Da6 Td3 
                       8.Th1+ Kg3 9.Tg1+ Kxh4 10.Th1+ Kg3 (2.649.501) 784 

17/20  0:03   +0.23++  1.Pxb6 (2.765.042) 783 

17/20  0:03   +0.25++  1.Pxb6 (2.798.642) 784 

17/34  0:03   +0.18--  1.Pxb6 cxb6 (2.918.969) 784 

17/34  0:03   +0.13--  1.Pxb6 cxb6 (2.948.548) 785 

17/34  0:04   +0.09    1.Pxb6 cxb6 2.Pg2 Lxa8 3.Lc2 dxc2 
                       4.Te1 Pd7 5.Pe3+ Kxh4 6.Th1+ Kg3 
                       7.Dc7 Dh7 8.Tg1+ Kh3 9.Th1+ (3.205.334) 786 

18/19  0:04   0.00     1.Pxb6 cxb6 2.Pg2 Lxa8 3.Lc2 dxc2 
                       4.Te1 Pd7 5.Pe3+ Kxh4 6.Th1+ Kg3 
                       7.Dc7 Dh7 8.Tg1+ Kh3 9.Th1+ (3.492.275) 783 

19/34  0:05   +0.02++  1.Pxb6 (4.074.378) 780 

19/34  0:05   +0.05++  1.Pxb6 (4.151.081) 780 

19/34  0:05   +0.08++  1.Pxb6 (4.196.126) 781 

19/34  0:05   +0.13++  1.Pxb6 (4.243.329) 782 

19/34  0:06   0.00     1.Pxb6 cxb6 2.Pg2 Te8 3.Dxb6 Lxa8 
                       4.Df6 Ph7 5.Db6 (5.050.699) 777 

20/27  0:07   0.00--   1.Pxb6 cxb6 (5.871.243) 771 

20/29  0:09   0.00--   1.Pxb6 cxb6 (7.087.514) 767 

20/29  0:10   0.00     1.Pxb6 cxb6 2.Lc2 dxc2 3.Pxc2 Lxa8 
                       4.Te1 Pg6 5.Pe3+ Kh3 6.Th1+ Kg3 
                       7.Dc7 Pxh4 8.Tg1+ Kh2 9.Te1 Th7 
                       10.Th1+ Kg3 11.Tg1+ Pg2 12.Pxf5+ Kh3 
                       13.Th1+ Kg4 (7.916.983) 769 

21/33  0:10   -0.04--  1.Pxb6 cxb6 (8.465.805) 769 

21/35  0:12   -0.06--  1.Pxb6 cxb6 (9.323.944) 769 

21/35  0:12   -0.04++  1.Pxb6 (9.803.482) 772 

21/35  0:12   0.00++   1.Pxb6 (9.989.790) 772 

21/35  0:13   -0.10--  1.Pxb6 cxb6 (10.251.135) 773 

21/35  0:13   -0.01++  1.Pxb6 (10.395.625) 774 

21/35  0:13   +0.08++  1.Pxb6 (10.753.325) 775 

21/35  0:14   +0.21++  1.Pxb6 (11.553.787) 777 

21/36  0:15   0.00     1.Pxb6 cxb6 2.Pg2 Te8 3.Dxb6 Lxa8 
                       4.Te1 e3 5.Pxe3+ Txe3 6.Dxe3 Kxh4 
                       7.Db6 Lg2 8.Df6+ Kg3 9.Dxf5 h4 
                       10.Df6 h3 11.f5 h2 12.Dd6+ Kg4 
                       13.Dd4+ Kg3 (12.108.036) 780 

22/36  0:16   +0.02--  1.Pxb6 cxb6 (12.533.735) 780 

22/36  0:16   0.00--   1.Pxb6 cxb6 (12.756.618) 781 

22/36  0:17   -0.02--  1.Pxb6 cxb6 (13.667.482) 780 

22/36  0:17   0.00     1.Pxb6 cxb6 2.Pg2 Te8 3.Dxb6 Lxa8 
                       4.Te1 e3 5.Pxe3+ Txe3 6.Dxe3 Kxh4 
                       7.Dd4 Le4 8.Tg1 Pe6 9.Df2+ Kh3 
                       10.De3+ Kh4 (13.899.619) 782 

23/32  0:18   0.00     1.Pxb6 cxb6 2.Pg2 Te8 3.Dxb6 Lxa8 
                       4.Te1 e3 5.Pxe3+ Txe3 6.Dxe3 Kxh4 
                       7.Dd4 Le4 8.Tg1 Pe6 9.Df2+ Kh3 
                       10.De3+ Kh4 (14.661.754) 782 

24/36  0:22   -0.02--  1.Pxb6 cxb6 (17.203.345) 781 

24/36  0:23   -0.04--  1.Pxb6 cxb6 (18.349.786) 782 

24/36  0:24   -0.08--  1.Pxb6 cxb6 (19.345.907) 784 

24/39  0:28   -0.12--  1.Pxb6 cxb6 (22.240.452) 785 

24/39  0:28   -0.08++  1.Pxb6 (22.773.554) 786 

24/39  0:28   0.00++   1.Pxb6 (22.813.162) 787 

24/39  0:29   0.00     1.Pxb6 cxb6 2.Pg2 Te8 3.Dxb6 Lxa8 
                       4.Te1 e3 5.Pxe3+ Txe3 6.Dxe3 Kxh4 
                       7.Dc5 Le4 8.Tg1 Dg4 9.Df2+ Kh3 
                       10.Df1+ Kh4 (22.961.513) 787 

25/36  0:31   -0.03--  1.Pxb6 cxb6 (24.522.655) 786 

25/38  0:32   -0.05--  1.Pxb6 cxb6 (25.899.501) 787 

25/38  0:33   -0.09--  1.Pxb6 cxb6 (26.577.439) 787 

25/38  0:38   -0.13--  1.Pxb6 cxb6 (30.201.189) 786 

25/40  0:40   -0.10++  1.Pxb6 (32.070.232) 786 

25/40  0:41   -0.01++  1.Pxb6 (32.486.677) 786 

25/40  0:41   0.00     1.Pxb6 cxb6 2.Pg2 Te8 3.Dxb6 Lxa8 
                       4.Te1 e3 5.Pxe3+ Txe3 6.Dxe3 Kxh4 
                       7.Dc5 Le4 8.Tg1 Dg4 9.Df2+ Kh3 
                       10.Df1+ Kh4 (32.849.048) 787 

26/39  0:44   0.00     1.Pxb6 cxb6 2.Pg2 Te8 3.Dxb6 Lxa8 
                       4.Te1 e3 5.Pxe3+ Txe3 6.Dxe3 Kxh4 
                       7.Dc5 Le4 8.Tg1 Dg4 9.Df2+ Kh3 
                       10.Df1+ Kh4 (34.979.201) 786 

27/49  0:51   -0.02--  1.Pxb6 cxb6 (40.377.882) 787 

27/49  0:54   -0.05--  1.Pxb6 cxb6 (42.623.491) 787 

27/49  0:58   -0.08--  1.Pxb6 cxb6 (46.105.932) 787 

27/49  1:01   -0.12--  1.Pxb6 cxb6 (48.824.550) 788 

27/49  1:13   -0.19--  1.Pxb6 cxb6 (57.524.051) 786 

27/49  1:28   -0.26--  1.Pxb6 cxb6 (69.476.271) 788 

27/49  1:48   -0.37--  1.Pxb6 cxb6 (85.244.764) 787 

27/49  1:50   -0.28++  1.Pxb6 (87.613.312) 789 

27/49  1:51   -0.18    1.Pxb6 cxb6 2.Pg2 Te8 3.Dxb6 Lxa8 
                       4.Te1 e3 5.Pxe3+ Txe3 6.Dxe3 Kxh4 
                       7.Dd4 Pe6 8.Df6+ Kg3 9.Txe6 Le4 
                       10.Txe4 fxe4 11.Dd4 Kh2 12.f5 Dg1 
                       13.Dxh8 Dxc1 14.Dxh5+ (87.842.692) 789 

28/42  2:01   -0.43--  1.Pxb6 cxb6 (95.602.775) 787 

28/45  2:11   -0.46--  1.Pxb6 cxb6 (103.699.627) 786 

28/45  2:18   -0.49--  1.Pxb6 cxb6 (109.382.798) 787 

28/47  2:21   -0.46++  1.Pxb6 (111.255.321) 788 

28/47  2:26   -0.53--  1.Pxb6 cxb6 (115.513.119) 788 

28/47  2:56   -0.62--  1.Pxb6 cxb6 (139.047.593) 786 

28/48  2:58   -0.54++  1.Pxb6 (140.156.294) 786 

28/48  2:58   -0.52    1.Pxb6 cxb6 2.Pg2 Te8 3.Dxb6 Lxa8 
                       4.Te1 e3 5.Pxe3+ Txe3 6.Dxe3 Kxh4 
                       7.Dd4 Lg2 8.Df6+ Kg4 9.Tg1 Kg3 
                       10.Dxf5 h4 11.De5 Pe6 12.Lc2 dxc2 
                       13.f5+ Pf4 14.d4 (140.303.688) 786 

29/43  3:01   -0.66++  1.Pxb6 (143.014.943) 786 

29/43  3:02   -0.63++  1.Pxb6 (143.654.633) 786 

29/43  3:03   -0.60++  1.Pxb6 (144.465.504) 786 

29/49  3:04   -0.56++  1.Pxb6 (145.273.742) 786 

29/49  3:13   -0.71--  1.Pxb6 cxb6 (152.075.892) 786 

29/54  3:14   -0.60++  1.Pxb6 (152.628.277) 786 

29/54  3:15   -0.50++  1.Pxb6 (153.623.684) 786 

29/54  3:42   -0.79--  1.Pxb6 cxb6 (173.928.027) 782 

29/54  3:43   -0.58++  1.Pxb6 (174.916.888) 782 

29/54  4:12   -0.86    1.Pxb6 cxb6 2.Pg2 Te8 3.Dxb6 Lxa8 
                       4.Te1 e3 5.Pxe3+ Txe3 6.Dxe3 Kxh4 
                       7.Dd4 Lg2 8.Df6+ Kg4 9.Tg1 Kg3 
                       10.Dxf5 h4 11.De5 Pd7 12.Dd6 De8 
                       13.Dd5 De2 14.Dg5+ (196.214.701) 776 

30/43  4:47   -0.99--  1.Pxb6 cxb6 (220.516.857) 767 

30/45  5:10   -1.01--  1.Pxb6 cxb6 (236.929.471) 763 

30/45  6:09   -1.04--  1.Pxb6 cxb6 (278.943.893) 755 

30/47  6:12   -1.01++  1.Pxb6 (281.379.874) 755 

30/47  6:12   -0.95++  1.Pxb6 (281.455.803) 755 

30/47  6:26   -0.87++  1.Pxb6 (291.664.105) 755 

30/47  6:53   -1.09--  1.Pxb6 cxb6 (311.582.841) 754 

30/47  6:54   -0.93++  1.Pxb6 (312.777.381) 754 

30/47  6:56   -0.76++  1.Pxb6 (314.276.280) 754 

30/48  7:09   -0.60    1.Pxb6 cxb6 2.Lc2 dxc2 3.Ta7 Pd7 
                       4.Dc7 Dd8 5.Pxc2 Dxc7 6.Txc7 Pf6 
                       7.Pd4 Ld7 8.Txd7 Pxd7 9.Pxe6 Pf8 
                       10.Pd4 Pg6 11.Te1 Pxh4 12.Tg1+ Kh3 
                       13.Kb1 Pg2 14.Pxf5 (324.141.816) 754 

31/54  7:21   -0.25--  1.Pxb6 cxb6 (333.643.638) 754 

31/54  7:24   -0.23++  1.Pxb6 (335.555.553) 755 

31/54  7:27   -0.28--  1.Pxb6 cxb6 (338.178.102) 755 

31/54  7:35   -0.33--  1.Pxb6 cxb6 (343.921.643) 755 

31/54  7:37   -0.28++  1.Pxb6 (345.759.112) 755 

31/54  7:42   -0.38--  1.Pxb6 cxb6 (349.231.159) 755 

31/54  7:43   -0.29++  1.Pxb6 (350.086.238) 755 

31/54  7:49   -0.46    1.Pxb6 cxb6 2.Lc2 dxc2 3.Ta7 Pd7 
                       4.Dc7 Dd8 5.Pxc2 Dxc7 6.Txc7 Th7 
                       7.Pd4 Ld5 8.Te1 Tf6 9.Pc2 Le6 
                       10.Tg1+ Kh3 11.Pd4 Ld5 12.Tg5 Thf7 
                       13.Txh5 Kg4 14.Tg5+ (354.867.900) 755 

32/43  8:16   -0.74--  1.Pxb6 cxb6 (375.529.815) 756 

32/48  8:21   -0.71++  1.Pxb6 (378.995.733) 756 

32/48  8:21   -0.68++  1.Pxb6 (379.134.157) 756 

32/48  8:21   -0.63++  1.Pxb6 (379.269.854) 756 

32/48  8:22   -0.57++  1.Pxb6 (380.035.413) 756 

32/48  8:32   -0.76--  1.Pxb6 cxb6 (387.447.159) 756 

32/50  8:40   -0.63++  1.Pxb6 (393.809.585) 756 

32/50  8:45   -0.64    1.Pxb6 cxb6 2.Lc2 dxc2 3.Ta7 Pd7 
                       4.Dc7 Dc8 5.Pxc2 Dxc7 6.Txc7 Th7 
                       7.Pd4 Ld5 8.Te1 Tf6 9.Pc2 Tff7 
                       10.Pe3+ Kxf4 11.Pxd5+ Ke5 12.Pe3 Thg7 
                       13.Tc8 f4 14.Pd1 (397.575.422) 756 

33/45  9:07   -0.55--  1.Pxb6 cxb6 (413.035.221) 754 

33/47  9:23   -0.57--  1.Pxb6 cxb6 (425.640.639) 755 

33/51  9:45   -0.61--  1.Pxb6 cxb6 (443.049.463) 756 

33/51  10:18  -0.65--  1.Pxb6 cxb6 (467.992.781) 757 

33/51  10:54  -0.71--  1.Pxb6 cxb6 (490.934.384) 750 

33/51  12:13  -0.79--  1.Pxb6 cxb6 (545.799.175) 743 

33/58  12:17  -0.73++  1.Pxb6 (548.583.874) 743 

33/58  12:18  -0.60++  1.Pxb6 (548.902.510) 743 

33/58  12:20  -0.64    1.Pxb6 cxb6 2.Lc2 dxc2 3.Ta7 Pd7 
                       4.Dc7 Dc8 5.Pxc2 Dxc7 6.Txc7 Th7 
                       7.Pd4 Ld5 8.Te1 Tf6 9.Pc2 Tff7 
                       10.Pe3+ Kxf4 11.Pxd5+ Ke5 12.Pe3 Thg7 
                       13.Tc8 f4 14.Pd1 (550.965.805) 743 

34/56  13:36  -0.78--  1.Pxb6 cxb6 (608.466.656) 744 

34/56  14:12  -0.81--  1.Pxb6 cxb6 (636.388.509) 746 

34/56  14:40  -0.84--  1.Pxb6 cxb6 (657.498.217) 747 

34/56  15:17  -0.89--  1.Pxb6 cxb6 (685.622.499) 746 

34/56  17:17  -0.95--  1.Pxb6 cxb6 (778.215.692) 749 

34/56  17:36  -0.90++  1.Pxb6 (792.690.881) 750 

34/56  17:40  -0.79++  1.Pxb6 (795.846.311) 750 

34/56  17:41  -0.82    1.Pxb6 cxb6 2.Lc2 dxc2 3.Ta7 Pd7 
                       4.Dc7 Dc8 5.Pxc2 Dxc7 6.Txc7 Thh6 
                       7.Te2 Kxh4 8.Pe3 Tef6 9.Tg2 Thg6 
                       10.Pxf5+ Kh3 11.Txg6 Txg6 12.Pe7 Tg1 
                       13.Pxc6 Pf6 14.Tf7 (796.807.746) 750 

35/52  19:04  -0.91--  1.Pxb6 cxb6 (859.466.260) 751 

35/52  19:08  -0.89++  1.Pxb6 (862.992.139) 751 

35/52  19:17  -0.86++  1.Pxb6 (869.667.591) 751 

35/52  19:20  -0.81++  1.Pxb6 (872.200.725) 751 

35/52  19:28  -0.75++  1.Pxb6 (878.297.867) 751 

35/57  20:01  -0.94--  1.Pxb6 cxb6 (903.527.057) 752 

35/71  22:38  -1.04--  1.Pxb6 cxb6 (1.024.877.395) 754 

35/71  23:44  -1.01    1.Pxb6 cxb6 2.Lc2 dxc2 3.Ta7 Pd7 
                       4.Dc7 Dc8 5.Pxc2 Dxc7 6.Txc7 Thh6 
                       7.Te2 Pf8 8.Pe3+ Kxf4 9.Tf2+ Kg3 
                       10.Txf5 Tef6 11.Tg7+ Kh3 12.Tfg5 Thg6 
                       13.T7xg6 Pxg6 14.Txh5 (1.075.932.644) 755 

36/57  26:01  -1.16--  1.Pxb6 cxb6 (1.181.190.035) 756 

36/57  27:02  -1.13++  1.Pxb6 (1.228.240.307) 756 

36/57  27:30  -1.10++  1.Pxb6 (1.249.962.342) 757 

36/57  29:15  -1.18--  1.Pxb6 cxb6 (1.329.506.587) 757 

36/57  32:08  -1.12++  1.Pxb6 (1.460.413.976) 757 

36/57  32:10  -1.03++  1.Pxb6 (1.461.924.321) 757 

36/57  33:04  -1.24--  1.Pxb6 cxb6 (1.502.521.505) 757 

36/58  33:28  -1.09++  1.Pxb6 (1.521.188.946) 757 

36/58  35:55  -1.25    1.Pxb6 cxb6 2.Pg2 Te8 3.Dxb6 Lxa8 
                       4.Te1 e3 5.Pxe3+ Txe3 6.Dxe3 Kxh4 
                       7.Tg1 Lg2 8.De5 Pd7 9.De7+ Kh3 
                       10.Dxd7 Dd5 11.De7 Tg8 12.Te1 Le4 
                       13.Te3+ Kg4 14.Dh7 (1.632.383.709) 757 

37/45  36:05  -1.29++  1.Pxb6 (1.640.262.995) 757 

37/45  36:06  -1.26++  1.Pxb6 (1.641.083.026) 757 

37/45  36:43  -1.35--  1.Pxb6 cxb6 (1.668.775.383) 757 

37/49  36:51  -1.29++  1.Pxb6 (1.675.660.013) 757 

37/49  36:57  -1.23++  1.Pxb6 (1.680.019.733) 757 

37/52  40:32  -1.39--  1.Pxb6 cxb6 (1.840.315.062) 756 

37/53  40:44  -1.27++  1.Pxb6 (1.850.087.029) 756 

37/53  41:07  -1.28    1.Pxb6 cxb6 2.Pg2 Te8 3.Dxb6 Lxa8 
                       4.Te1 e3 5.Pxe3+ Txe3 6.Dxe3 Kxh4 
                       7.Dc5 Th6 8.Dxb5 Le4 9.Dc5 Pd7 
                       10.Dd4 Pf6 11.La2 Dg3 12.Tg1 Df3 
                       13.Lxc4 Pg4 14.Lb5 (1.866.346.948) 756 

38/51  41:10  -1.18++  1.Pxb6 (1.868.932.146) 756 

38/51  41:11  -1.16++  1.Pxb6 (1.869.451.080) 756 

38/51  41:12  -1.12++  1.Pxb6 (1.870.142.565) 756 

38/51  41:50  -1.19    1.Pxb6 cxb6 2.Pg2 Te8 3.Dxb6 Lxa8 
                       4.Te1 e3 5.Pxe3+ Txe3 6.Dxe3 Kxh4 
                       7.Dc5 Th6 8.Dxb5 Le4 9.Dc5 Pd7 
                       10.Dd4 Pf6 11.La2 Dg3 12.Tg1 Df3 
                       13.Lxc4 Pg4 14.Lb5 (1.897.578.067) 755 

39/48  42:39  -1.13++  1.Pxb6 (1.934.874.542) 755 

39/57  42:49  -1.11++  1.Pxb6 (1.942.315.053) 755 

39/57  43:02  -1.07++  1.Pxb6 (1.952.215.621) 756 

39/57  43:10  -1.03++  1.Pxb6 (1.958.717.037) 756 

39/57  45:19  -1.19--  1.Pxb6 cxb6 (2.059.291.007) 757 

39/60  45:47  -1.08++  1.Pxb6 (2.081.885.405) 757 

39/60  45:59  -0.97++  1.Pxb6 (2.090.994.314) 757 

39/69  46:35  -0.84++  1.Pxb6 (2.119.013.520) 758 

39/69  48:28  -1.09    1.Pxb6 cxb6 2.Pg2 Te8 3.Dxb6 Lxa8 
                       4.Te1 e3 5.Pxe3+ Txe3 6.Dxe3 Kxh4 
                       7.Dc5 Le4 8.Dxb5 Dd5 9.Dxa4 Kh3 
                       10.La2 Pg6 11.Te3+ Kh2 12.b5 Pxf4 
                       13.Lxc4 Dc5 14.Db3 (2.206.536.532) 758 

40/58  55:13  -0.97--  1.Pxb6 cxb6 (2.518.804.868) 760 

40/58  58:51  -0.99--  1.Pxb6 cxb6 (2.685.654.757) 760 

40/58  62:18  -1.02--  1.Pxb6 cxb6 (2.845.387.869) 761 

40/58  66:23  -1.07--  1.Pxb6 cxb6 (3.029.540.955) 760
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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User avatar
Eelco de Groot
Posts: 4692
Joined: Sun Mar 12, 2006 2:40 am
Full name:   Eelco de Groot

Re: Nice study by Troitsky

Post by Eelco de Groot »

Other moves than 1.Nxb6 are not very promising says Crystal;


[fen]RQN2nqr/2p5/1bb1r3/1p3p1p/pPp1pPkP/P1PpR3/3P4/KBB1N3 w - -[/fen]


Engine: Crystal 5 KWK NNUE II (512 MB)
gemaakt door the Stockfish developers (see AUTHORS f

32 153:47 -1.21 1.Pxb6 cxb6 2.Pg2 Te8 3.Dxb6 Lxa8
4.Te1 e3 5.Pxe3+ Txe3 6.Dxe3 Kxh4
7.Tg1 Lg2 8.De5 Pd7 9.De7+ Kh3
10.Dxd7 Dd5 11.De7 Tg8 12.Te1 Le4
13.Te3+ Kg4 14.Dh7 (7.425.854.044) 804

32 153:47 -8.21 1.Pxd3 Lxe3 2.Pe5+ Txe5 3.fxe5 Pg6
4.dxe3 Lxa8 5.Dxa8 Dxc8 6.Dd5 Pxh4
7.e6 Dd8 8.De5 Pg6 9.Dxb5 h4 10.Lxe4 fxe4
11.Dc6 Kf5 12.e7 Dxe7 13.Dxc4 Kg5
14.Df1 (7.425.854.044) 804

32 153:47 -8.39 1.Lxd3 Lxe3 2.Lb1 Pd7 3.Dxc7 Dd8
4.Dxd8 Txd8 5.Ta6 Lxf4 6.Pa7 Pb8
7.Tb6 Lc7 8.Txb5 Lxb5 9.Pxb5 Lg3
10.Pc2 f4 11.La2 Pc6 12.Lxc4 Te7
13.d4 exd3 14.Pbd4 (7.425.854.044) 804

32 153:47 -8.81 1.Pg2 Pd7 2.Pxb6 Pxb8 3.Pxc4 bxc4
4.Ta7 Pd7 5.La2 Pb6 6.Kb2 Tg6 7.Txc7 Db8
8.Tf7 Pd5 9.Te1 Kh3 10.Txf5 Txg2
11.Lxc4 Dxf4 12.Txf4 Pxf4 13.La6 La8
14.c4 (7.425.854.044) 804

32 153:47 -9.15 1.Ta6 Pd7 2.Txb6 Pxb8 3.Txb8 Kxh4
4.Pe7 Txe7 5.Txg8 Txg8 6.Lxd3 cxd3
7.Pxd3 Tg3 8.Pe5 Txe5 9.fxe5 Tg1
10.Te2 f4 11.Th2+ Kg4 12.Kb2 f3
13.d3 exd3 14.Le3 (7.425.854.044) 804

So if the 1.Nxb6 line is to work, you have to show something better for White I suppose, mabybe after


[pgn][Event "Computer chess game"]
[Site "WORKSTATION-PC"]
[Date "2023.03.29"]
[Round "?"]
[White "Stockfish"]
[Black "Stockfish"]
[WhiteElo "3600"]
[BlackElo "2000"]
[Result "*"]
[SetUp "1"]
[FEN "RQN2nqr/2p5/1bb1r3/1p3p1p/pPp1pPkP/P1PpR3/3P4/KBB1N3 w - -"]

1. Nxb6 cxb6 2. Ng2 Re8 3. Qxb6 Bxa8 4. Re1 e3 5. Nxe3+
Rxe3 6. Qxe3 Kxh4 *[/pgn]

Best five moves for Crystal here


[fen]b4nqr/8/8/1p3p1p/pPp2P1k/P1PpQ3/3P4/KBB1R3 w - -[/fen]


Engine: Crystal 5 KWK NNUE II (512 MB)
gemaakt door the Stockfish developers (see AUTHORS f

29 12:54 -1.01 7.Dc5 Le4 8.Dxb5 Th6 9.Dc5 Pd7
10.Dd4 Pf6 11.La2 Dg3 12.Tg1 Df3
13.Lxc4 Pg4 14.Lb5 Kh3 15.c4 Df2
16.Dxf2 Pxf2 17.Lb2 h4 18.c5 Lg2
19.Tc1 Kg3 20.c6 (683.109.481) 882

28 12:54 -1.44 7.Dd4 Lg2 8.Df6+ Kg4 9.Tg1 Kg3
10.Dxf5 h4 11.De5 Pe6 12.De3+ Kh2
13.Td1 Pxf4 14.Dxf4+ Dg3 15.Df7 Tg8
16.Lb2 Tg5 17.Df6 Te5 18.Db6 Kh3
19.Tc1 Df3 20.Dd6 (683.109.481) 882

28 12:54 -2.03 7.Db6 Pd7 8.Dxb5 Df7 9.Tg1 De6
10.Dxa4 Lf3 11.La2 Kh3 12.b5 Tc8
13.Db4 Ld5 14.Tg5 Pf6 15.b6 Tb8
16.a4 Dxb6 17.Txf5 Tb7 18.a5 De6
19.Te5 Txb4 20.Txe6 (683.109.481) 882

28 12:54 -2.34 7.De8 Dg3 8.Te3 Pg6 9.De6 Lf3
10.Dxf5 Tb8 11.Df6+ Kh3 12.De6+ Kg2
13.f5 Pf4 14.Dd7 Pe2 15.Lb2 Tf8
16.Dxb5 Df4 17.Dxa4 h4 18.b5 h3
19.Db4 Dxe3 20.Dxf8 (683.109.481) 882

28 12:54 -2.50 7.Kb2 Le4 8.Tg1 Lg2 9.Dc5 Pd7
10.Dxb5 Dd5 11.Dxa4 Pf6 12.Da6 Dc6
13.Dxc6 Lxc6 14.La2 Ld5 15.Tg5 Tf8
16.a4 Pe4 17.Tg7 Tf7 18.Tg8 Ta7
19.Td8 Le6 20.Ka3 (683.109.481) 882
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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