Stockfish 1 with 12 threads and 2 hours vs Stockfish 17.1 with 12 threads and 1 minute, who wins?

[Jouni]

MY ran just interesting 100 to 1 handicap matches here https://prodeo.actieforum.com/f1-computer-chess .

[Leto]

Turns out Stockfish 1 only supports maximum of 8 threads so the handicap wasn't as big as I thought. I will still go ahead with the 240 to 1 ratio game but I'll set Stockfish 17.1 to 8 threads to make it fairer.

[Leto]

So this time I set them both to 8 threads to make it fairer, and I tried the 240 to 1 ratio by giving Stockfish 17.1 only 0.25s per move and Stockfish 1.9.1 1 minute per move, and again no book. Stockfish 17.1 won scoring 99.6 accuracy versus Stockfish 1's 94.5 accuracy according to chess.com.

[Event "My Tournament"]
[Site "?"]
[Date "2025.11.06"]
[Round "1"]
[White "Stockfish 17.1 8CPU"]
[Black "Stockfish 1.9.1 8CPU"]
[Result "1-0"]
[ECO "C13"]
[WhiteFideId "-1"]
[WhiteFideId "-1"]
[PlyCount "84"]
[GameId "2241401387561316"]
[EventDate "2025.??.??"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. h4 a6 7. Qg4 Bxg5 8. hxg5 c5 9. dxc5 Nxe5 10. Qg3 Nbc6 11. O-O-O Qa5 12. f4 Ng6 13. f5 Nge7 14. f6 gxf6 15. gxf6 Nf5 16. Qe1 Qxc5 17. Nxd5 Ncd4 18. c4 Bd7 19. b4 Qd6 20. g4 Rc8 21. Kb2 Ba4 22. Rd2 Qg3 23. Qe4 Nb3 24. Rdh2 Nd6 25. Qe3 Qxe3 26. Nxe3 Nd4 27. Rd2 e5 28. Rh5 Kf8 29. Bd3 Rd8 30. Bb1 Rg8 31. Bxh7 Rh8 32. c5 Ne8 33. g5 Nc6 34. Rdh2 e4 35. Bxe4 Rd2+ 36. Rxd2 Rxh5 37. Nf3 Nxb4 38. Rd4 a5 39. a3 Na6 40. Rxa4 Nxc5 41. Rc4 Nxe4 42. Rxe4 Rh3 1-0


And here's the output from Cutechess:
[Event "My Tournament"]
[Site "?"]
[Date "2025.11.06"]
[Round "1"]
[White "Stockfish 17.1 8CPU"]
[Black "Stockfish 1.9.1 8CPU"]
[Result "1-0"]
[BlackTimeControl "60/move"]
[ECO "C13"]
[GameDuration "00:42:12"]
[GameEndTime "2025-11-06T20:50:27.118 Eastern Standard Time"]
[GameStartTime "2025-11-06T20:08:14.310 Eastern Standard Time"]
[Opening "French"]
[PlyCount "84"]
[Termination "adjudication"]
[Variation "Albin-Alekhine-Chatard attack, Maroczy variation"]
[WhiteTimeControl "0.25/move"]

1. e4 {+0.39/18 0.25s} e6 {-0.20/25 60s} 2. d4 {+0.41/18 0.25s}
d5 {-0.16/27 60s} 3. Nc3 {+0.46/20 0.25s} Nf6 {0.00/25 60s}
4. Bg5 {+0.42/19 0.25s} Be7 {0.00/27 60s} 5. e5 {+0.56/18 0.25s}
Nfd7 {0.00/25 60s} 6. h4 {+0.62/17 0.25s} a6 {-0.08/25 60s}
7. Qg4 {+1.17/16 0.25s} Bxg5 {0.00/26 60s} 8. hxg5 {+1.18/17 0.25s}
c5 {-0.28/26 60s} 9. dxc5 {+1.21/14 0.25s} Nxe5 {0.00/26 60s}
10. Qg3 {+1.49/19 0.26s} Nbc6 {-0.04/26 60s} 11. O-O-O {+1.46/16 0.25s}
Qa5 {0.00/26 60s} 12. f4 {+1.52/17 0.25s} Ng6 {0.00/26 60s}
13. f5 {+1.53/18 0.25s} Nge7 {+0.16/24 60s} 14. f6 {+1.68/17 0.25s}
gxf6 {-0.72/23 60s} 15. gxf6 {+1.63/15 0.25s} Nf5 {-0.64/23 60s}
16. Qe1 {+1.71/16 0.25s} Qxc5 {-0.92/24 60s} 17. Nxd5 {+1.95/16 0.25s}
Ncd4 {-0.68/25 60s} 18. c4 {+1.98/17 0.25s} Bd7 {-0.60/26 60s}
19. b4 {+1.93/17 0.25s} Qd6 {-0.76/24 60s} 20. g4 {+1.99/17 0.25s}
Rc8 {-1.37/23 60s} 21. Kb2 {+2.25/16 0.25s} Ba4 {-1.45/24 60s}
22. Rd2 {+2.58/13 0.25s} Qg3 {-1.53/24 60s} 23. Qe4 {+2.90/14 0.25s}
Nb3 {-1.29/25 60s} 24. Rdh2 {+2.87/16 0.25s} Nd6 {-1.41/26 60s}
25. Qe3 {+2.97/16 0.25s} Qxe3 {-1.37/26 60s} 26. Nxe3 {+2.83/13 0.25s}
Nd4 {-1.73/26 60s} 27. Rd2 {+2.95/14 0.25s} e5 {-1.69/25 60s}
28. Rh5 {+3.02/15 0.25s} Kf8 {-2.34/24 60s} 29. Bd3 {+3.06/16 0.25s}
Rd8 {-2.38/25 60s} 30. Bb1 {+3.27/17 0.25s} Rg8 {-2.50/25 60s}
31. Bxh7 {+3.51/15 0.25s} Rh8 {-2.82/26 60s} 32. c5 {+3.71/14 0.25s}
Ne8 {-3.63/26 60s} 33. g5 {+3.89/15 0.25s} Nc6 {-3.51/25 60s}
34. Rdh2 {+4.38/15 0.25s} e4 {-5.25/24 60s} 35. Bxe4 {+4.65/18 0.25s}
Rd2+ {-5.13/29 60s} 36. Rxd2 {+4.72/14 0.25s} Rxh5 {-5.57/30 60s}
37. Nf3 {+4.83/18 0.25s} Nxb4 {-5.49/29 60s} 38. Rd4 {+4.89/16 0.25s}
a5 {-5.37/30 60s} 39. a3 {+5.11/16 0.25s} Na6 {-6.22/29 60s}
40. Rxa4 {+4.99/16 0.25s} Nxc5 {-6.02/26 60s} 41. Rc4 {+5.04/17 0.25s}
Nxe4 {-7.79/25 60s} 42. Rxe4 {+5.11/17 0.25s}
Rh3 {-8.12/25 60s, White wins by adjudication} 1-0

Only three inaccuracies according to chess.com and they were all from Stockfish 1. The inaccuracies were 16...Qxc5, 20...Rc8, and 30...Rg8. So I'm still thinking there's a limit to how strong an engine can get if you give it enough time and this makes logical sense to me. If you have a flawed system for deciding moves then there will be instances in which infinite time will not be enough for it to find the best moves.

[jkominek]

Only three inaccuracies according to chess.com and they were all from Stockfish 1. The inaccuracies were 16...Qxc5, 20...Rc8, and 30...Rg8.

Chess.com may not have the best game analysis going. According the the giant opening tree database chessdb.cn, the move 16...Qxc5 is, currently, listed as the best available. If so that disqualifies it from being an inaccuracy let alone an outright error.

Given the strength of SF17.1 and weakness of SF1.91, very likely there is but a single theoretical mistake in the game. chessdb.cn suggests a deeper look at 6...a6. After that move the evaluation for white jumps from 4 centipawns to 114, just over the win/draw border -- with the game fate perhaps sealed a move later with 7...Bxg5, having an evaluation of 149. A caveat need be mentioned though. These numbers are from shallow searches. That's where following with deep homefish/homeleela analysis helps.

So I'm still thinking there's a limit to how strong an engine can get if you give it enough time and this makes logical sense to me. If you have a flawed system for deciding moves then there will be instances in which infinite time will not be enough for it to find the best moves.

Well that's a fair conjecture. It raises an interesting question too. Theoretically, an alpha-beta search with no heuristic pruning will eventually - VERY eventually - yield the correct answer every time. If an engine with speculative selective search such as SF1.91 has an inherent limit to its performance then, at some point, the full-width non-selective search will surpass it. Turtle overtaking the hare, so to speak.

The same could be said of the latest super-strong Stockfish. When given infinite time it too may never find the correct move to some positions. But since there is a supply shortage of infinite computers, how would anyone know?

[Uri Blass]

So this time I set them both to 8 threads to make it fairer, and I tried the 240 to 1 ratio by giving Stockfish 17.1 only 0.25s per move and Stockfish 1.9.1 1 minute per move, and again no book. Stockfish 17.1 won scoring 99.6 accuracy versus Stockfish 1's 94.5 accuracy according to chess.com.

[Event "My Tournament"]
[Site "?"]
[Date "2025.11.06"]
[Round "1"]
[White "Stockfish 17.1 8CPU"]
[Black "Stockfish 1.9.1 8CPU"]
[Result "1-0"]
[ECO "C13"]
[WhiteFideId "-1"]
[WhiteFideId "-1"]
[PlyCount "84"]
[GameId "2241401387561316"]
[EventDate "2025.??.??"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. h4 a6 7. Qg4 Bxg5 8. hxg5 c5 9. dxc5 Nxe5 10. Qg3 Nbc6 11. O-O-O Qa5 12. f4 Ng6 13. f5 Nge7 14. f6 gxf6 15. gxf6 Nf5 16. Qe1 Qxc5 17. Nxd5 Ncd4 18. c4 Bd7 19. b4 Qd6 20. g4 Rc8 21. Kb2 Ba4 22. Rd2 Qg3 23. Qe4 Nb3 24. Rdh2 Nd6 25. Qe3 Qxe3 26. Nxe3 Nd4 27. Rd2 e5 28. Rh5 Kf8 29. Bd3 Rd8 30. Bb1 Rg8 31. Bxh7 Rh8 32. c5 Ne8 33. g5 Nc6 34. Rdh2 e4 35. Bxe4 Rd2+ 36. Rxd2 Rxh5 37. Nf3 Nxb4 38. Rd4 a5 39. a3 Na6 40. Rxa4 Nxc5 41. Rc4 Nxe4 42. Rxe4 Rh3 1-0


And here's the output from Cutechess:
[Event "My Tournament"]
[Site "?"]
[Date "2025.11.06"]
[Round "1"]
[White "Stockfish 17.1 8CPU"]
[Black "Stockfish 1.9.1 8CPU"]
[Result "1-0"]
[BlackTimeControl "60/move"]
[ECO "C13"]
[GameDuration "00:42:12"]
[GameEndTime "2025-11-06T20:50:27.118 Eastern Standard Time"]
[GameStartTime "2025-11-06T20:08:14.310 Eastern Standard Time"]
[Opening "French"]
[PlyCount "84"]
[Termination "adjudication"]
[Variation "Albin-Alekhine-Chatard attack, Maroczy variation"]
[WhiteTimeControl "0.25/move"]

1. e4 {+0.39/18 0.25s} e6 {-0.20/25 60s} 2. d4 {+0.41/18 0.25s}
d5 {-0.16/27 60s} 3. Nc3 {+0.46/20 0.25s} Nf6 {0.00/25 60s}
4. Bg5 {+0.42/19 0.25s} Be7 {0.00/27 60s} 5. e5 {+0.56/18 0.25s}
Nfd7 {0.00/25 60s} 6. h4 {+0.62/17 0.25s} a6 {-0.08/25 60s}
7. Qg4 {+1.17/16 0.25s} Bxg5 {0.00/26 60s} 8. hxg5 {+1.18/17 0.25s}
c5 {-0.28/26 60s} 9. dxc5 {+1.21/14 0.25s} Nxe5 {0.00/26 60s}
10. Qg3 {+1.49/19 0.26s} Nbc6 {-0.04/26 60s} 11. O-O-O {+1.46/16 0.25s}
Qa5 {0.00/26 60s} 12. f4 {+1.52/17 0.25s} Ng6 {0.00/26 60s}
13. f5 {+1.53/18 0.25s} Nge7 {+0.16/24 60s} 14. f6 {+1.68/17 0.25s}
gxf6 {-0.72/23 60s} 15. gxf6 {+1.63/15 0.25s} Nf5 {-0.64/23 60s}
16. Qe1 {+1.71/16 0.25s} Qxc5 {-0.92/24 60s} 17. Nxd5 {+1.95/16 0.25s}
Ncd4 {-0.68/25 60s} 18. c4 {+1.98/17 0.25s} Bd7 {-0.60/26 60s}
19. b4 {+1.93/17 0.25s} Qd6 {-0.76/24 60s} 20. g4 {+1.99/17 0.25s}
Rc8 {-1.37/23 60s} 21. Kb2 {+2.25/16 0.25s} Ba4 {-1.45/24 60s}
22. Rd2 {+2.58/13 0.25s} Qg3 {-1.53/24 60s} 23. Qe4 {+2.90/14 0.25s}
Nb3 {-1.29/25 60s} 24. Rdh2 {+2.87/16 0.25s} Nd6 {-1.41/26 60s}
25. Qe3 {+2.97/16 0.25s} Qxe3 {-1.37/26 60s} 26. Nxe3 {+2.83/13 0.25s}
Nd4 {-1.73/26 60s} 27. Rd2 {+2.95/14 0.25s} e5 {-1.69/25 60s}
28. Rh5 {+3.02/15 0.25s} Kf8 {-2.34/24 60s} 29. Bd3 {+3.06/16 0.25s}
Rd8 {-2.38/25 60s} 30. Bb1 {+3.27/17 0.25s} Rg8 {-2.50/25 60s}
31. Bxh7 {+3.51/15 0.25s} Rh8 {-2.82/26 60s} 32. c5 {+3.71/14 0.25s}
Ne8 {-3.63/26 60s} 33. g5 {+3.89/15 0.25s} Nc6 {-3.51/25 60s}
34. Rdh2 {+4.38/15 0.25s} e4 {-5.25/24 60s} 35. Bxe4 {+4.65/18 0.25s}
Rd2+ {-5.13/29 60s} 36. Rxd2 {+4.72/14 0.25s} Rxh5 {-5.57/30 60s}
37. Nf3 {+4.83/18 0.25s} Nxb4 {-5.49/29 60s} 38. Rd4 {+4.89/16 0.25s}
a5 {-5.37/30 60s} 39. a3 {+5.11/16 0.25s} Na6 {-6.22/29 60s}
40. Rxa4 {+4.99/16 0.25s} Nxc5 {-6.02/26 60s} 41. Rc4 {+5.04/17 0.25s}
Nxe4 {-7.79/25 60s} 42. Rxe4 {+5.11/17 0.25s}
Rh3 {-8.12/25 60s, White wins by adjudication} 1-0

Only three inaccuracies according to chess.com and they were all from Stockfish 1. The inaccuracies were 16...Qxc5, 20...Rc8, and 30...Rg8. So I'm still thinking there's a limit to how strong an engine can get if you give it enough time and this makes logical sense to me. If you have a flawed system for deciding moves then there will be instances in which infinite time will not be enough for it to find the best moves.

This is clearly not the conclusion and my guess is that old stockfish needs more time in order to draw against stockfish17.1

I believe 6...a6 was bad and I believe stockfish1.9.1 can suggest a better move at longer time control.

[Uri Blass]

My stockfish suggested after more than 3 hours Bxg5 and I stopped it.
I think h6 it suggested earlier is also better than a6
[d]rnbqk2r/pppnbppp/4p3/3pP1B1/3P3P/2N5/PPP2PP1/R2QKBNR b KQkq h3 0 6


Stockfish-191-64-ja:
1 00:00 1k 233k +0.20 O-O
2 00:00 1k 213k -0.16 O-O Ng1-f3
2 00:00 1k 227k +0.04 Be7xg5 h4xg5 O-O
3 00:00 2k 265k -0.60 Be7xg5 h4xg5 O-O Qd1-h5
3 00:00 2k 255k +0.40 O-O Ng1-f3 Nb8-c6
4 00:00 3k 335k +0.20 O-O Bf1-d3 h7-h6 Bg5-f4 Be7xh4
5 00:00 4k 379k -0.16 O-O Bf1-d3 h7-h6 Bg5xe7 Qd8xe7 Ng1-f3
5 00:00 5k 425k -0.08 Be7xg5 h4xg5 Nb8-c6 Ng1-f3 O-O Qd1-d3
5 00:00 6k 458k +0.36 Nb8-c6 Ng1-f3 O-O Bf1-d3 f7-f6
6 00:00 8k 492k +0.36 Nb8-c6 Ng1-f3 O-O Bf1-b5 f7-f6 Bb5xc6 b7xc6
7 00:00 11k 516k +0.36 Nb8-c6 Ng1-f3 O-O Bf1-b5 f7-f6 Bb5xc6 b7xc6
8- 00:00 13k 529k +0.28 Nb8-c6 Ng1-f3 O-O Bf1-b5 f7-f6 e5xf6 Nd7xf6 O-O
8- 00:00 25k 573k +0.20 Nb8-c6 Ng1-f3 O-O Bf1-b5 f7-f6 e5xf6 Nd7xf6 O-O
8 00:00 30k 604k +0.20 Nb8-c6 Ng1-f3 O-O Bf1-b5 f7-f6 e5xf6 g7xf6 Bg5-h6
9- 00:00 35k 643k +0.04 Nb8-c6 Ng1-f3 O-O Bf1-b5 f7-f6 e5xf6 g7xf6 Bg5-h6
9- 00:00 55k 728k -0.12 Nb8-c6 Ng1-f3 O-O Bf1-b5 f7-f6 e5xf6 g7xf6 Bg5-h6
9 00:00 96k 919k -0.04 O-O Qd1-g4 f7-f5 Bg5xe7 Qd8xe7 Qg4-g5 Qe7xg5 h4xg5 c7-c5 g5-g6 h7xg6
10+ 00:00 139k 992k +0.28 O-O Qd1-g4 f7-f5 Bg5xe7 Qd8xe7 Qg4-g5 Qe7xg5 h4xg5 c7-c5 g5-g6 h7xg6
10 00:00 152k 1,035k +0.32 O-O Qd1-g4 f7-f5 Bg5xe7 Qd8xe7 Qg4-g5 Qe7xg5 h4xg5 c7-c5 d4xc5 Nd7xc5 Ng1-f3 Nb8-c6 O-O-O Bc8-d7
11- 00:00 240k 1,149k -0.16 O-O Qd1-g4 f7-f5 Bg5xe7 Qd8xe7 Qg4-g5 Qe7xg5 h4xg5 c7-c5 Nc3-b5 Nb8-c6 Nb5-c7 Nc6xd4 O-O-O
11 00:00 348k 1,345k +0.04 c7-c5 Bg5xe7 Qd8xe7 Nc3-b5 Ke8-d8 Ng1-f3 Nb8-c6 c2-c3 c5xd4 c3xd4 f7-f6 e5xf6 Nd7xf6
12 00:00 1,276k 2,583k -0.08 c7-c5 Bg5xe7 Qd8xe7 Nc3-b5 Ke8-d8 c2-c3 c5xd4 c3xd4 Nb8-c6 f2-f4 f7-f6 Ng1-f3 Qe7-b4+ Qd1-d2 f6xe5 f4xe5 Qb4xd2+ Ke1xd2 a7-a6 Nb5-d6
13 00:00 2,397k 3,333k -0.20 c7-c5 Bg5xe7 Ke8xe7 Qd1-h5 h7-h6 d4xc5 Nb8-c6 O-O-O Nd7xe5 Qh5-e2 Ke7-f8 Ng1-f3 Ne5xf3 Qe2xf3 Bc8-d7
13+ 00:00 2,844k 3,604k +0.20 O-O Qd1-g4 Rf8-e8 Bg5-h6 Be7-f8 O-O-O c7-c5 Ng1-f3 c5xd4 Rd1xd4 Nb8-c6
13 00:00 2,962k 3,612k -0.12 O-O Qd1-g4 Rf8-e8 Ng1-f3 c7-c5 d4xc5 Nb8-c6 Bf1-b5 Be7xg5 Qg4xg5 Qd8-a5 Qg5-e3 Nc6-b4 Ke1-d2
14+ 00:01 3,708k 3,411k 0.00 O-O Qd1-g4 Rf8-e8 Ng1-f3 c7-c5 d4xc5 Qd8-a5 Bg5xe7 Re8xe7 b2-b4 Qa5-a3
14 00:01 3,754k 3,403k -0.04 O-O Qd1-g4 Rf8-e8 Ng1-f3 c7-c5 d4xc5 Qd8-a5 Bg5xe7 Re8xe7 Bf1-b5 a7-a6 Bb5xd7 Bc8xd7 O-O-O Nb8-c6 Nc3-a4 Nc6xe5 Nf3xe5 Bd7xa4
15 00:01 4,548k 3,674k -0.08 O-O Qd1-g4 Rf8-e8 Ng1-f3 c7-c5 d4xc5 Qd8-a5 Bf1-b5 Be7xc5 Bg5-h6 Bc5-f8 O-O-O a7-a6 Bb5-d3 Nb8-c6 Nf3-g5 g7xh6 Ng5xe6+ Kg8-h8
16+ 00:01 5,168k 3,842k 0.00 O-O Qd1-g4 Rf8-e8 Ng1-f3 c7-c5 d4xc5 Qd8-a5 Bf1-b5 Be7xc5 Bg5-h6 Bc5-f8 O-O-O a7-a6 Bb5-d3 Nb8-c6 Nf3-g5 Nd7xe5 Bd3xh7+ Kg8-h8
16+ 00:01 5,637k 4,047k +0.08 O-O Ng1-f3 c7-c5 Bg5xe7 Qd8xe7
16 00:01 8,002k 4,900k -0.04 O-O Qd1-g4 Kg8-h8 Bg5xe7 Qd8xe7 O-O-O c7-c5 Bf1-b5 a7-a6 Bb5xd7 Bc8xd7 Ng1-f3 c5xd4 Qg4xd4 Nb8-c6 Qd4-b6 Qe7-b4 Qb6xb4 Nc6xb4
17+ 00:02 10,956k 5,440k +0.04 O-O Qd1-g4 Kg8-h8 Bg5xe7 Qd8xe7 O-O-O c7-c5 Bf1-b5 f7-f6 Ng1-f3 c5xd4 e5xf6 Nd7xf6 Qg4xd4 a7-a6
17+ 00:02 11,788k 5,613k +0.12 O-O Ng1-f3 c7-c5 Bg5xe7 Qd8xe7
17 00:02 13,004k 5,884k +0.04 O-O Qd1-g4 Kg8-h8 Bg5xe7 Qd8xe7 O-O-O c7-c5 Bf1-b5 f7-f6 Ng1-f3 c5xd4 Qg4xd4 f6xe5 Nf3xe5 Nd7xe5 Qd4xe5 Qe7-f7 Kc1-b1 Qf7xf2
18+ 00:02 16,871k 6,499k +0.16 O-O Qd1-g4 Kg8-h8 Bg5xe7 Qd8xe7 O-O-O c7-c5 Bf1-b5 f7-f6 Ng1-f3 c5xd4 Qg4xd4 f6xe5 Nf3xe5 Nd7xe5 Qd4xe5 Nb8-c6 Bb5xc6 b7xc6 Rd1-d2 Bc8-a6
18- 00:02 19,548k 6,720k -0.08 O-O Qd1-g4 Kg8-h8 Ng1-f3 c7-c5 Bf1-d3 c5xd4 Bd3xh7 g7-g6 Bh7xg6 f7xg6 Qg4xe6 d4xc3 h4-h5
18 00:03 25,680k 7,169k +0.04 O-O Qd1-g4 Rf8-e8 Ng1-f3 c7-c5 d4xc5 Nb8-c6 Bf1-b5 Nd7xc5 O-O-O Bc8-d7 Qg4-h5 h7-h6 Bg5xe7 Qd8xe7 Bb5xc6 b7xc6 b2-b4 Nc5-a6 a2-a3
19- 00:03 28,488k 7,357k -0.04 O-O Qd1-g4 Rf8-e8 Ng1-f3 c7-c5 d4xc5 Nb8-c6 Bf1-b5 Nd7xc5 O-O-O Bc8-d7 Kc1-b1 Qd8-b6 Bg5-h6 Be7-f8 Bb5-e2 Nc6-b4 Bh6-e3 g7-g6 h4-h5
19 00:05 41,648k 7,983k -0.08 O-O Qd1-g4 Rf8-e8 Ng1-f3 c7-c5 d4xc5 Nb8-c6 Bf1-b5 Nc6xe5 Nf3xe5 Nd7xe5 Qg4-g3 Ne5-c6 O-O-O Bc8-d7 Kc1-b1 Qd8-a5 Bg5xe7 Re8xe7 Qg3-d6 Ra8-e8 Bb5xc6 Bd7xc6
20 00:06 52,423k 8,325k -0.04 O-O Qd1-g4 Rf8-e8 Ng1-f3 c7-c5 d4xc5 Nb8-c6 Bf1-b5 Nc6xe5 Nf3xe5 Nd7xe5 Qg4-g3 Ne5-c6 O-O-O Bc8-d7 Kc1-b1 a7-a6 Bb5xc6 b7xc6 Bg5xe7 Qd8xe7 Qg3-c7 Ra8-b8 Rh1-e1 e6-e5
21- 00:09 88,301k 8,956k -0.16 O-O Qd1-g4 Rf8-e8 Ng1-f3 c7-c5 d4xc5 Nb8-c6 Bf1-b5 Nc6xe5 Nf3xe5 Nd7xe5 Qg4-g3 Ne5-c6 O-O-O Bc8-d7 Bg5xe7 Nc6xe7 Bb5xd7 Qd8xd7 Nc3-e4
21+ 00:18 177,531k 9,563k +0.08 a7-a6 Qd1-g4 Be7xg5 Qg4xg5 O-O Ng1-f3 c7-c5 Bf1-d3 h7-h6 Qg5xd8 Rf8xd8 d4xc5 Nd7xc5 O-O-O Nb8-c6 Nc3-e2 Bc8-d7
21+ 00:20 198,301k 9,656k +0.20 a7-a6 Qd1-g4 Be7xg5 h4xg5 c7-c5 d4xc5 Nd7xe5 Qg4-g3 Nb8-c6 O-O-O Qd8-a5 Qg3-e3 Qa5-b4 Ng1-f3 Ne5-g4
21 00:22 212,482k 9,650k 0.00 a7-a6 Qd1-g4 Be7xg5 h4xg5 c7-c5 d4xc5 Nd7xe5 Qg4-g3 Nb8-c6 Ng1-f3 Ne5xf3+ g2xf3 Qd8-e7 g5-g6 h7-h5 O-O-O f7-f5 Nc3-a4 h5-h4 Qg3-h2 Bc8-d7 Qh2-c7 Bd7-c8 Qc7-h2
22- 00:23 226,316k 9,673k -0.08 a7-a6 Qd1-g4 Be7xg5 h4xg5 c7-c5 d4xc5 Nd7xe5 Qg4-g3 Nb8-c6 O-O-O Qd8-a5 Ng1-f3 Ne5xf3 g2xf3 Qa5xc5 g5-g6 f7xg6 Rh1xh7 Rh8xh7 Qg3xg6+ Ke8-f8 Qg6xh7 Qc5xf2 Qh7-h8+ Kf8-f7 Bf1-d3 Qf2-e3+ Kc1-b1 Qe3xf3 Qh8-h7
22- 00:24 238,352k 9,630k -0.16 a7-a6 Qd1-g4 Be7xg5 h4xg5 c7-c5 d4xc5 Nd7xe5 Qg4-g3 Nb8-c6 O-O-O Qd8-e7 f2-f4 Ne5-d7 g5-g6 f7xg6 Bf1-d3 g6-g5 f4xg5 Nc6-b4 Bd3xh7 Nd7-f8 g5-g6 Qe7xc5 Ng1-f3
22 00:27 260,472k 9,624k -0.28 a7-a6 Qd1-g4 Be7xg5 h4xg5 c7-c5 d4xc5 Nd7xe5 Qg4-g3 Nb8-c6 O-O-O Qd8-a5 Ng1-f3 Ne5xf3 g2xf3 d5-d4 Nc3-e4 Qa5xa2 Qg3-c7 Qa2-a1+ Kc1-d2 Qa1-a5+ Qc7xa5 Nc6xa5 Bf1-d3 Ke8-e7 Ne4-d6 h7-h6 g5xh6 Rh8xh6 Rh1xh6 g7xh6 Rd1-h1 Bc8-d7 Rh1xh6
22 00:30 299,904k 9,711k 0.00 Be7xg5 h4xg5 Qd8xg5 Ng1-f3 Qg5-e7 Qd1-d2 a7-a6 Bf1-d3 c7-c5 d4xc5 Nb8-c6 Qd2-f4 h7-h6 Qf4-g3 Ke8-f8 O-O-O Nd7xc5 Kc1-b1 Bc8-d7 Nc3-e2 Nc5xd3 Rd1xd3 Nc6-b4 Rd3-c3 Bd7-a4 Ne2-f4
23- 00:34 340,641k 9,865k -0.08 Be7xg5 h4xg5 Qd8xg5 Qd1-d3 h7-h6 Nc3-b5 Qg5-d8 Qd3-g3 g7-g6 O-O-O a7-a6 Nb5-c3 c7-c5 d4xc5 Nb8-c6 Ng1-f3 Nd7xc5 Kc1-b1 Qd8-b6 Qg3-f4 Qb6-b4 Qf4-e3
23+ 00:39 397,474k 9,949k +0.08 Nb8-c6 Bg5xe7 Nc6xe7 Bf1-d3 c7-c5 Ng1-f3 c5xd4 Nf3xd4 O-O O-O Qd8-b6 Qd1-h5 h7-h6 Nd4-b3 Ne7-c6
23 00:46 468,681k 10,061k -0.12 Be7xg5 h4xg5 Qd8xg5 Qd1-d3 h7-h6 Nc3-b5 Qg5-d8 Qd3-g3 g7-g6 O-O-O a7-a6 Nb5-c3 c7-c5 d4xc5 Nb8-c6 Ng1-f3 Nd7xc5 Kc1-b1 h6-h5 Bf1-e2 Bc8-d7 Qg3-f4 O-O
23 00:47 477,385k 10,054k -0.08 Nb8-c6 Qd1-d2 f7-f6 e5xf6 Nd7xf6 O-O-O Be7-d6 Kc1-b1 O-O Ng1-f3 h7-h6 Bg5-e3 Nf6-g4 Bf1-d3 Ng4xe3 Qd2xe3 Qd8-f6 Bd3-b5 Bd6-f4 Qe3-e2 Bc8-d7 Rh1-e1 Ra8-e8 Bb5xc6 Bd7xc6
24+ 00:55 556,608k 10,066k 0.00 Nb8-c6 Qd1-d2 f7-f6 e5xf6 Nd7xf6 O-O-O O-O Ng1-f3 Be7-d6 Kc1-b1 h7-h6 Bg5-e3 Nf6-g4 Bf1-d3 Ng4xe3 Qd2xe3 Qd8-f6 Bd3-b5 Nc6-e7 a2-a3 Ne7-f5 Qe3-e2 c7-c6
24 00:55 559,430k 10,062k 0.00 Nb8-c6 Qd1-d2 f7-f6 e5xf6 Nd7xf6 O-O-O O-O Ng1-f3 Be7-d6 Kc1-b1 h7-h6 Bg5-e3 Nf6-g4 Bf1-d3 Bc8-d7 Nc3-b5 Ng4xe3 f2xe3 Bd6-e7 Nb5-c3 Be7-d6 Nc3-b5
25- 01:06 671,280k 10,032k -0.12 Nb8-c6 Qd1-d2 f7-f6 e5xf6 Nd7xf6 O-O-O O-O Kc1-b1 Qd8-d6 Ng1-f3 Bc8-d7 Bf1-d3 Qd6-b4 Qd2-e3 Be7-d6 Bg5xf6 Rf8xf6 Nf3-g5
25 01:19 806,289k 10,105k +0.08 Be7xg5 h4xg5 Qd8xg5 Qd1-d3 h7-h6 Nc3-b5 Qg5-d8 Qd3-g3 g7-g6 O-O-O a7-a6 Nb5-a3 c7-c5 c2-c3 c5xd4 c3xd4 Nd7-b6 Kc1-b1 Bc8-d7 Bf1-e2 Nb8-c6 Na3-c2 h6-h5 Ng1-h3 Nb6-c4 Be2xc4 d5xc4 Qg3-c3 b7-b5 d4-d5 e6xd5 Rd1xd5
26- 01:41 1,038,536k 10,196k -0.04 Be7xg5 h4xg5 Qd8xg5 Ng1-f3 Qg5-e7 Qd1-d2 a7-a6 O-O-O c7-c5 Qd2-f4 Nb8-c6 Qf4-g3 c5xd4 Nf3xd4 Nc6xd4 Rd1xd4 f7-f6 e5xf6 Qe7xf6 Rd4-f4
26 02:03 1,251,790k 10,129k 0.00 Be7xg5 h4xg5 Qd8xg5 Ng1-f3 Qg5-e7 Qd1-d2 a7-a6 Qd2-f4 c7-c5 Qf4-g3 Ke8-f8 d4xc5 Nb8-c6 O-O-O h7-h5 Nc3-a4 Nd7xc5 Na4xc5 Qe7xc5 Kc1-b1 Bc8-d7 c2-c3 Qc5-e7 Bf1-d3 h5-h4 Qg3-g4 Qe7-c5 Rh1xh4 Rh8xh4 Qg4xh4
27- 02:36 1,595,293k 10,180k -0.12 Be7xg5 h4xg5 Qd8xg5 Ng1-h3 Qg5-h6 Nc3-b5 Nb8-a6 g2-g3 f7-f6 Bf1-g2 f6xe5 Nh3-f4 Qh6-f6 Qd1-h5+ Ke8-d8 Nf4-g6
27 02:53 1,775,076k 10,213k 0.00 O-O Qd1-g4 Rf8-e8 Ng1-f3 c7-c5 d4xc5 Nb8-c6 Bf1-b5 Nc6xe5 Nf3xe5 Nd7xe5 Qg4-g3 Ne5-c6 O-O-O Bc8-d7 Bg5-h6 Be7-f6 Bh6-g5 Bf6-e7
28- 03:34 2,199,223k 10,244k -0.08 O-O Qd1-g4 Rf8-e8 Ng1-f3 c7-c5 d4xc5 Nb8-c6 Qg4-g3 Nd7xc5 O-O-O Qd8-c7 Bf1-b5 Bc8-d7
28- 03:48 2,334,129k 10,229k -0.16 O-O Qd1-g4 Kg8-h8 Qg4-h5 c7-c5 Ng1-f3 c5xd4 Bf1-d3 g7-g6 Qh5-h6 d4xc3 h4-h5 c3xb2 h5xg6 b2xa1Q+ Ke1-e2 Qa1-d1+ Ke2xd1
28 05:29 3,393,323k 10,302k -0.04 Nb8-c6 Qd1-d2 O-O O-O-O f7-f6 e5xf6 Nd7xf6 Kc1-b1 Bc8-d7 Ng1-f3 Be7-d6 h4-h5 h7-h6 Bg5-h4 Qd8-e8 Bh4xf6 Rf8xf6 Bf1-d3 Qe8-f8 Bd3-b5 Bd6-f4 Qd2-e1 Qf8-f7 Rh1-h4 a7-a6
29- 05:40 3,506,014k 10,306k -0.12 Nb8-c6 Qd1-d2 O-O O-O-O f7-f6 e5xf6 Nd7xf6 Kc1-b1 Bc8-d7 Ng1-f3 Be7-d6 Qd2-e1 a7-a6 g2-g3 h7-h6 Bf1-h3 h6xg5 Bh3xe6+
29+ 06:55 4,272,610k 10,279k +0.04 h7-h6 Qd1-h5 c7-c5 d4xc5 Nb8-c6 O-O-O Nd7xe5 Ng1-f3 Ne5xf3 g2xf3 g7-g6
29+ 08:20 5,166,927k 10,321k +0.12 h7-h6 Bg5xe7 Qd8xe7 Qd1-d2 O-O f2-f4 c7-c5 Ng1-f3 Nb8-c6 O-O-O a7-a6 Kc1-b1 b7-b5 g2-g3 Bc8-b7 Bf1-e2 c5xd4 Nf3xd4 Nd7-c5 Be2-f3 Ra8-c8 Bf3xd5 e6xd5 Nc3xd5 Qe7-d7
29 09:09 5,690,410k 10,348k 0.00 h7-h6 Bg5-e3 c7-c5 Qd1-g4 Ke8-f8 Ng1-f3 Nb8-c6 O-O-O c5xd4 Be3xd4 Nc6xd4 Qg4xd4 Kf8-g8 Qd4-f4 a7-a6 Nf3-d4 Qd8-c7 Rd1-e1 b7-b5 Kc1-b1 Bc8-b7 Bf1-d3 b5-b4 Nc3-a4 Be7-f6
30 09:53 6,128,524k 10,329k 0.00 h7-h6 Bg5-e3 c7-c5 Qd1-g4 Ke8-f8 Ng1-f3 Nb8-c6 Qg4-f4 c5xd4 Be3xd4 f7-f6 O-O-O Qd8-c7 Nc3-b5 Qc7-b8 Nb5-d6 Be7xd6 e5xd6 e6-e5
31 11:53 7,373,670k 10,327k 0.00 h7-h6 Bg5-e3 c7-c5 Qd1-g4 Ke8-f8 f2-f4 c5xd4 Be3xd4 Nb8-c6 Ng1-f3 Be7-b4 Rh1-h3 Nc6xd4 Nf3xd4 Nd7-c5 O-O-O Bb4xc3 Rh3xc3 Nc5-e4 Rc3-f3 h6-h5 Qg4-h3 Qd8-a5 Rf3-a3 Qa5-d8 Ra3-f3
32 14:58 9,361,638k 10,424k 0.00 h7-h6 Bg5-f4 c7-c5 Qd1-g4 Ke8-f8 O-O-O c5xd4 Nc3-b5 Qd8-a5 Kc1-b1 Nb8-c6 Ng1-f3 Nc6-b4 a2-a3 d4-d3 a3xb4 d3xc2+ Kb1xc2 Qa5-a4+ Kc2-c1 Qa4-a1+ Kc1-c2 Qa1-a4+
33+ 17:00 10,687,570k 10,476k +0.08 h7-h6 Bg5-f4 c7-c5 Qd1-g4 Ke8-f8 d4xc5 Be7xc5 Qg4-g3 Qd8-b6
33 22:38 14,327,778k 10,548k 0.00 h7-h6 Bg5xe7 Qd8xe7 Qd1-d2 O-O f2-f4 c7-c5 Ng1-f3 Nb8-c6 O-O-O a7-a6 Kc1-b1 b7-b5 g2-g4 Bc8-b7 g4-g5 h6-h5 Nc3-e2 c5xd4 Ne2xd4 Nd7-c5 Qd2-e3 Nc5-e4 g5-g6 f7xg6 Bf1-h3 Nc6xd4 Nf3xd4 Bb7-c8 Bh3-g2
34+ 26:14 16,722,593k 10,619k +0.08 h7-h6 Bg5xe7 Qd8xe7 Qd1-d2 O-O f2-f4 c7-c5 Ng1-f3 Nb8-c6 O-O-O a7-a6 Kc1-b1
34+ 30:32 19,570,812k 10,681k +0.16 h7-h6 Qd1-h5 c7-c5 Bg5xe7 Ke8xe7 O-O-O c5xd4 Nc3-b5 g7-g6 Qh5-e2 Qd8-a5 Kc1-b1 Nb8-c6 Ng1-f3 d4-d3
34 42:06 27,351,570k 10,824k +0.04 h7-h6 Qd1-h5 c7-c5 Bg5xe7 Ke8xe7 O-O-O c5xd4 Nc3-b5 g7-g6 Qh5-e2 Qd8-a5 a2-a3 d4-d3 Qe2xd3 a7-a6 Nb5-c3 Nd7xe5 Qd3-g3 Nb8-d7 f2-f4 Ne5-c6 h4-h5 Rh8-g8 h5xg6 Rg8xg6 Qg3-h4+ Ke7-f8 f4-f5 Rg6-f6 Ng1-f3 Rf6xf5 Qh4xh6+ Kf8-e8 Qh6-g7
35+ 51:43 33,882,103k 10,918k +0.12 h7-h6 Qd1-h5 c7-c5 Bg5xe7 Ke8xe7 O-O-O c5xd4 Nc3-b5 g7-g6
35- 1:09:37 45,751,274k 10,953k -0.04 h7-h6 Bg5xe7 Qd8xe7 f2-f4 O-O Ng1-f3 c7-c5 Qd1-d2 Nb8-c6 O-O-O a7-a6 g2-g4 b7-b5 Nc3-e2 Nd7-b6 d4xc5 Qe7xc5 Ne2-d4 Nc6xd4 Nf3xd4 Bc8-d7 Kc1-b1 Rf8-c8 g4-g5 h6-h5 g5-g6 f7xg6 Qd2-g2 Qc5-b4 a2-a3 Qb4-e7 Qg2xg6 Nb6-a4 Bf1-h3
35 1:22:48 54,165,637k 10,901k 0.00 h7-h6 Bg5xe7 Qd8xe7 f2-f4 O-O Ng1-f3 c7-c5 Qd1-d2 Nb8-c6 O-O-O a7-a6 g2-g4 b7-b5 Nc3-e2 Ra8-b8 Kc1-b1 Nd7-b6 Qd2-e3 Nb6-c4 Qe3-g1 c5xd4 Ne2xd4 Qe7-b4 Nd4-b3 Qb4-a4 Nb3-c5 Qa4-b4 Nc5-b3
36 1:35:31 62,198,347k 10,852k 0.00 h7-h6 Bg5xe7 Qd8xe7 f2-f4 O-O Ng1-f3 c7-c5 Qd1-d2 Nb8-c6 O-O-O a7-a6 g2-g4 b7-b5 Nc3-e2 Ra8-b8 Kc1-b1 Nd7-b6 d4xc5 Nb6-c4 Qd2-e1 Qe7xc5 Ne2-d4 Bc8-d7 Nd4xc6 Qc5xc6 Nf3-d4 Qc6-b6 g4-g5 h6-h5 Bf1-e2 g7-g6 Rh1-h3 Qb6-c5 Nd4-b3 Qc5-b6 Nb3-d4
37- 2:04:25 80,801,878k 10,823k -0.08 h7-h6 Bg5xe7 Qd8xe7 f2-f4 O-O
37 3:00:22 117,578,147k 10,864k 0.00 Be7xg5 h4xg5 Qd8xg5 Rh1-h3 Nb8-c6 Rh3-g3 Qg5-h6 Ng1-f3 a7-a6 Rg3-h3 Qh6-g6 Rh3-g3 Qg6-h6

[Leto]

So this time I set them both to 8 threads to make it fairer, and I tried the 240 to 1 ratio by giving Stockfish 17.1 only 0.25s per move and Stockfish 1.9.1 1 minute per move, and again no book. Stockfish 17.1 won scoring 99.6 accuracy versus Stockfish 1's 94.5 accuracy according to chess.com.

[Event "My Tournament"]
[Site "?"]
[Date "2025.11.06"]
[Round "1"]
[White "Stockfish 17.1 8CPU"]
[Black "Stockfish 1.9.1 8CPU"]
[Result "1-0"]
[ECO "C13"]
[WhiteFideId "-1"]
[WhiteFideId "-1"]
[PlyCount "84"]
[GameId "2241401387561316"]
[EventDate "2025.??.??"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. h4 a6 7. Qg4 Bxg5 8. hxg5 c5 9. dxc5 Nxe5 10. Qg3 Nbc6 11. O-O-O Qa5 12. f4 Ng6 13. f5 Nge7 14. f6 gxf6 15. gxf6 Nf5 16. Qe1 Qxc5 17. Nxd5 Ncd4 18. c4 Bd7 19. b4 Qd6 20. g4 Rc8 21. Kb2 Ba4 22. Rd2 Qg3 23. Qe4 Nb3 24. Rdh2 Nd6 25. Qe3 Qxe3 26. Nxe3 Nd4 27. Rd2 e5 28. Rh5 Kf8 29. Bd3 Rd8 30. Bb1 Rg8 31. Bxh7 Rh8 32. c5 Ne8 33. g5 Nc6 34. Rdh2 e4 35. Bxe4 Rd2+ 36. Rxd2 Rxh5 37. Nf3 Nxb4 38. Rd4 a5 39. a3 Na6 40. Rxa4 Nxc5 41. Rc4 Nxe4 42. Rxe4 Rh3 1-0


And here's the output from Cutechess:
[Event "My Tournament"]
[Site "?"]
[Date "2025.11.06"]
[Round "1"]
[White "Stockfish 17.1 8CPU"]
[Black "Stockfish 1.9.1 8CPU"]
[Result "1-0"]
[BlackTimeControl "60/move"]
[ECO "C13"]
[GameDuration "00:42:12"]
[GameEndTime "2025-11-06T20:50:27.118 Eastern Standard Time"]
[GameStartTime "2025-11-06T20:08:14.310 Eastern Standard Time"]
[Opening "French"]
[PlyCount "84"]
[Termination "adjudication"]
[Variation "Albin-Alekhine-Chatard attack, Maroczy variation"]
[WhiteTimeControl "0.25/move"]

1. e4 {+0.39/18 0.25s} e6 {-0.20/25 60s} 2. d4 {+0.41/18 0.25s}
d5 {-0.16/27 60s} 3. Nc3 {+0.46/20 0.25s} Nf6 {0.00/25 60s}
4. Bg5 {+0.42/19 0.25s} Be7 {0.00/27 60s} 5. e5 {+0.56/18 0.25s}
Nfd7 {0.00/25 60s} 6. h4 {+0.62/17 0.25s} a6 {-0.08/25 60s}
7. Qg4 {+1.17/16 0.25s} Bxg5 {0.00/26 60s} 8. hxg5 {+1.18/17 0.25s}
c5 {-0.28/26 60s} 9. dxc5 {+1.21/14 0.25s} Nxe5 {0.00/26 60s}
10. Qg3 {+1.49/19 0.26s} Nbc6 {-0.04/26 60s} 11. O-O-O {+1.46/16 0.25s}
Qa5 {0.00/26 60s} 12. f4 {+1.52/17 0.25s} Ng6 {0.00/26 60s}
13. f5 {+1.53/18 0.25s} Nge7 {+0.16/24 60s} 14. f6 {+1.68/17 0.25s}
gxf6 {-0.72/23 60s} 15. gxf6 {+1.63/15 0.25s} Nf5 {-0.64/23 60s}
16. Qe1 {+1.71/16 0.25s} Qxc5 {-0.92/24 60s} 17. Nxd5 {+1.95/16 0.25s}
Ncd4 {-0.68/25 60s} 18. c4 {+1.98/17 0.25s} Bd7 {-0.60/26 60s}
19. b4 {+1.93/17 0.25s} Qd6 {-0.76/24 60s} 20. g4 {+1.99/17 0.25s}
Rc8 {-1.37/23 60s} 21. Kb2 {+2.25/16 0.25s} Ba4 {-1.45/24 60s}
22. Rd2 {+2.58/13 0.25s} Qg3 {-1.53/24 60s} 23. Qe4 {+2.90/14 0.25s}
Nb3 {-1.29/25 60s} 24. Rdh2 {+2.87/16 0.25s} Nd6 {-1.41/26 60s}
25. Qe3 {+2.97/16 0.25s} Qxe3 {-1.37/26 60s} 26. Nxe3 {+2.83/13 0.25s}
Nd4 {-1.73/26 60s} 27. Rd2 {+2.95/14 0.25s} e5 {-1.69/25 60s}
28. Rh5 {+3.02/15 0.25s} Kf8 {-2.34/24 60s} 29. Bd3 {+3.06/16 0.25s}
Rd8 {-2.38/25 60s} 30. Bb1 {+3.27/17 0.25s} Rg8 {-2.50/25 60s}
31. Bxh7 {+3.51/15 0.25s} Rh8 {-2.82/26 60s} 32. c5 {+3.71/14 0.25s}
Ne8 {-3.63/26 60s} 33. g5 {+3.89/15 0.25s} Nc6 {-3.51/25 60s}
34. Rdh2 {+4.38/15 0.25s} e4 {-5.25/24 60s} 35. Bxe4 {+4.65/18 0.25s}
Rd2+ {-5.13/29 60s} 36. Rxd2 {+4.72/14 0.25s} Rxh5 {-5.57/30 60s}
37. Nf3 {+4.83/18 0.25s} Nxb4 {-5.49/29 60s} 38. Rd4 {+4.89/16 0.25s}
a5 {-5.37/30 60s} 39. a3 {+5.11/16 0.25s} Na6 {-6.22/29 60s}
40. Rxa4 {+4.99/16 0.25s} Nxc5 {-6.02/26 60s} 41. Rc4 {+5.04/17 0.25s}
Nxe4 {-7.79/25 60s} 42. Rxe4 {+5.11/17 0.25s}
Rh3 {-8.12/25 60s, White wins by adjudication} 1-0

Only three inaccuracies according to chess.com and they were all from Stockfish 1. The inaccuracies were 16...Qxc5, 20...Rc8, and 30...Rg8. So I'm still thinking there's a limit to how strong an engine can get if you give it enough time and this makes logical sense to me. If you have a flawed system for deciding moves then there will be instances in which infinite time will not be enough for it to find the best moves.

This is clearly not the conclusion and my guess is that old stockfish needs more time in order to draw against stockfish17.1

I believe 6...a6 was bad and I believe stockfish1.9.1 can suggest a better move at longer time control.

In that game SF 1 already had an advantage of 240 times as much as time as SF 17. I think that's already a big handicap. But you think with just more time SF1 can draw or outplay SF17? I suppose I could give SF1 480 times as much time as SF17.

[Leto]

So this time I gave Stockfish 1 480 times as much time as Stockfish 17, 2 minutes per move vs 0.25 seconds per move, and this time I let SF 1 play white. Here's the result:

[Event "SF 1 vs SF 17 480x"]
[Site "?"]
[Date "2025.11.11"]
[Round "1"]
[White "Stockfish 1.9.1 8CPU"]
[Black "Stockfish 17.1 8CPU"]
[Result "0-1"]
[ECO "C69"]
[WhiteFideId "-1"]
[WhiteFideId "-1"]
[PlyCount "101"]
[GameId "2243028407972448"]
[EventDate "2025.??.??"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 dxc6 5. O-O f6 6. d4 exd4 7. Nxd4 c5 8. Ne2 Qxd1 9. Rxd1 Bd7 10. Be3 O-O-O 11. Nbc3 b6 12. a4 Bd6 13. Bf4 Bxf4 14. Nxf4 Ne7 15. a5 Kb7 16. f3 Nc6 17. axb6 cxb6 18. Rd2 Bc8 19. Rad1 Rd4 20. Nh5 Rg8 21. Ne2 Rxd2 22. Rxd2 b5 23. Rd5 Kb6 24. Nef4 b4 25. Rd6 c4 26. Kf2 a5 27. Rd1 a4 28. Ra1 Ka5 29. Ke3 f5 30. h3 g5 31. Nd5 Be6 32. Nhf6 f4+ 33. Ke2 Nd4+ 34. Kd2 Rd8 35. Rd1 b3 36. cxb3 cxb3 37. Rb1 Nc2 38. Rc1 h6 39. Rxc2 bxc2 40. Kxc2 Rb8 41. Kc3 Rc8+ 42. Kd2 Bxd5 43. Nxd5 Kb5 44. Ne7 Re8 45. Nf5 Kb4 46. Kc2 Rc8+ 47. Kb1 Rc7 48. g3 fxg3 49. Nxg3 Kb3 50. Ne2 Rd7 51. Nc1+ 0-1

According to chess.com's maximum review of the game white was 92% accurate and was given a 2450 game rating, and black was 97.6% accurate and was given a 2500 game rating. Note that the highest ever game rating I've seen it give out was 2550, I hope they raise the limit. The game review says white made three inaccuracies, 28.Ra1 36.cxb3, and 39.Rxc2, and two mistakes, 30.h3 and 33.Ke2. Says black made two inaccuracies, 30...g5 and 34...f4+.

here's the full output if anyone is interested:

[Event "SF 1 vs SF 17 480x"]
[Site "?"]
[Date "2025.11.11"]
[Round "1"]
[White "Stockfish 1.9.1 8CPU"]
[Black "Stockfish 17.1 8CPU"]
[Result "0-1"]
[BlackTimeControl "0.25/move"]
[ECO "C69"]
[GameDuration "01:42:15"]
[GameEndTime "2025-11-11T08:28:43.375 Eastern Standard Time"]
[GameStartTime "2025-11-11T06:46:27.801 Eastern Standard Time"]
[Opening "Ruy Lopez"]
[PlyCount "101"]
[Termination "adjudication"]
[Variation "Exchange, Gligoric variation"]
[WhiteTimeControl "120/move"]

1. e4 {+0.16/27 120s} e5 {-0.28/19 0.25s} 2. Nf3 {+0.44/27 120s}
Nc6 {-0.35/18 0.25s} 3. Bb5 {+0.32/27 120s} a6 {-0.35/19 0.25s}
4. Bxc6 {+0.32/28 120s} dxc6 {-0.07/16 0.25s} 5. O-O {+0.44/28 120s}
f6 {-0.08/20 0.25s} 6. d4 {+0.36/27 120s} exd4 {-0.04/18 0.25s}
7. Nxd4 {+0.40/26 120s} c5 {0.00/22 0.25s} 8. Ne2 {+0.40/27 120s}
Qxd1 {-0.15/15 0.25s} 9. Rxd1 {+0.32/29 120s} Bd7 {-0.16/17 0.25s}
10. Be3 {+0.24/27 120s} O-O-O {-0.11/17 0.25s} 11. Nbc3 {+0.28/29 120s}
b6 {-0.09/18 0.25s} 12. a4 {+0.40/28 120s} Bd6 {-0.02/17 0.25s}
13. Bf4 {+0.28/27 120s} Bxf4 {+0.01/17 0.25s} 14. Nxf4 {+0.52/29 120s}
Ne7 {-0.06/16 0.25s} 15. a5 {+0.28/27 120s} Kb7 {-0.01/17 0.25s}
16. f3 {+0.40/27 120s} Nc6 {+0.01/19 0.25s} 17. axb6 {+0.24/29 120s}
cxb6 {-0.03/18 0.25s} 18. Rd2 {+0.28/29 120s} Bc8 {-0.05/17 0.25s}
19. Rad1 {+0.28/29 120s} Rd4 {0.00/20 0.25s} 20. Nh5 {+0.24/28 120s}
Rg8 {+0.10/16 0.25s} 21. Ne2 {+0.36/27 120s} Rxd2 {+0.20/15 0.25s}
22. Rxd2 {+0.36/28 120s} b5 {+0.12/15 0.25s} 23. Rd5 {+0.48/26 120s}
Kb6 {+0.20/16 0.25s} 24. Nef4 {+0.36/28 120s} b4 {+0.15/15 0.25s}
25. Rd6 {+0.40/27 120s} c4 {+0.28/16 0.25s} 26. Kf2 {+0.32/25 120s}
a5 {+0.31/19 0.25s} 27. Rd1 {+0.40/26 120s} a4 {+0.56/14 0.25s}
28. Ra1 {+0.12/26 120s} Ka5 {+1.11/16 0.25s} 29. Ke3 {-0.08/28 120s}
f5 {+1.09/15 0.25s} 30. h3 {0.00/29 120s} g5 {+1.36/16 0.25s}
31. Nd5 {-0.16/28 120s} Be6 {+1.18/16 0.25s} 32. Nhf6 {-0.08/29 120s}
f4+ {+1.04/16 0.25s} 33. Ke2 {-0.32/28 120s} Nd4+ {+1.47/15 0.25s}
34. Kd2 {-0.64/29 120s} Rd8 {+1.24/14 0.25s} 35. Rd1 {-0.80/29 120s}
b3 {+1.58/17 0.25s} 36. cxb3 {-0.64/29 120s} cxb3 {+2.13/15 0.25s}
37. Rb1 {-1.65/27 120s} Nc2 {+2.31/18 0.25s} 38. Rc1 {-1.69/28 120s}
h6 {+2.49/16 0.25s} 39. Rxc2 {-2.38/26 120s} bxc2 {+3.29/18 0.25s}
40. Kxc2 {-2.34/27 120s} Rb8 {+3.19/17 0.25s} 41. Kc3 {-2.06/27 120s}
Rc8+ {+3.28/17 0.25s} 42. Kd2 {-2.70/28 120s} Bxd5 {+3.49/17 0.25s}
43. Nxd5 {-3.39/33 120s} Kb5 {+3.51/18 0.25s} 44. Ne7 {-3.47/30 120s}
Re8 {+3.77/17 0.25s} 45. Nf5 {-5.01/31 120s} Kb4 {+4.48/19 0.25s}
46. Kc2 {-5.77/32 120s} Rc8+ {+4.70/17 0.25s} 47. Kb1 {-5.73/32 120s}
Rc7 {+4.85/16 0.25s} 48. g3 {-6.74/30 120s} fxg3 {+4.96/16 0.25s}
49. Nxg3 {-6.82/30 120s} Kb3 {+5.11/14 0.25s} 50. Ne2 {-8.12/28 120s}
Rd7 {+5.19/16 0.25s} 51. Nc1+ {-8.64/28 120s, Black wins by adjudication} 0-1

[Uri Blass]

Old Stockfish needs with 6 cores 4096 mbytes hash needs more than 4 hours to find 33.Kd2 that may be too late to save the game
[d]6r1/7p/2n1bN2/k2N2p1/ppp1Pp2/4KP1P/1PP3P1/R7 w - - 0 33

Stockfish-191-64-ja:
1 00:00 310 103k +1.61 Ke3-f2
2 00:00 640 160k +1.01 Ke3-f2 Rg8-d8
2 00:00 795 199k +1.05 Ke3-d2 Rg8-d8
2 00:00 1k 253k +1.09 Ke3-e2 Rg8-d8
3 00:00 2k 358k +0.80 Ke3-e2 Nc6-d4+ Ke2-d2 Rg8-d8
4 00:00 3k 390k +0.52 Ke3-e2 Nc6-d4+ Ke2-d2 Rg8-d8 Ra1-d1
4 00:00 4k 444k +1.05 Ke3-d2 Rg8-d8 c2-c3 Ka5-b5 c3xb4 Be6xd5 Nf6xd5 Nc6xb4
5 00:00 4k 455k +1.05 Ke3-d2 Rg8-d8 c2-c3 Ka5-b5 c3xb4 Be6xd5 Nf6xd5 Nc6xb4
6 00:00 5k 467k +1.05 Ke3-d2 Rg8-d8 c2-c3 Ka5-b5 c3xb4 Be6xd5 Nf6xd5 Nc6xb4
7- 00:00 9k 522k +0.96 Ke3-d2 Rg8-d8 c2-c3 Ka5-b5 c3xb4 Be6xd5 Nf6xd5 Nc6xb4
7- 00:00 12k 514k +0.88 Ke3-d2 Rg8-d8 c2-c3 Ka5-b5 c3xb4 Be6xd5 Nf6xd5 Nc6xb4
7- 00:00 15k 527k +0.72 Ke3-d2 Rg8-d8 c2-c3 Ka5-b5 c3xb4 Be6xd5 Nf6xd5 Nc6xb4
7 00:00 19k 569k +0.64 Ke3-d2 Rg8-d8 c2-c3 Ka5-b5 Kd2-e2 Be6xd5 Nf6xd5 a4-a3 b2xa3 b4xc3 Nd5xc3+ Kb5-c5
8 00:00 32k 613k +0.64 Ke3-d2 Rg8-d8 c2-c3 Ka5-b5 Nf6-e8 Be6xd5 Ne8-c7+ Kb5-b6 Nc7xd5+ Kb6-b5 h3-h4 g5xh4 c3xb4 Nc6xb4
9- 00:00 49k 753k +0.44 Ke3-d2 Rg8-d8 c2-c3 Ka5-b5 Nf6-e8 Be6xd5 Ne8-c7+ Kb5-c5 Nc7xd5 a4-a3 b2xa3 b4-b3
9- 00:00 71k 860k +0.24 Ke3-d2 Rg8-d8 c2-c3 Ka5-b5 Nf6-e8 Be6xd5 Ne8-c7+ Kb5-c5 Nc7xd5 a4-a3 b2xa3 b4-b3
9 00:00 96k 902k +0.52 Ke3-f2 Rg8-d8 h3-h4 Be6xd5 e4xd5 Nc6-d4 h4xg5 Nd4xc2 Ra1-h1 a4-a3
10- 00:00 130k 1,068k +0.40 Ke3-f2 Rg8-d8 h3-h4 Be6xd5 e4xd5 Nc6-d4 h4xg5 Nd4xc2 Ra1-h1 a4-a3
10- 00:00 162k 1,146k +0.28 Ke3-f2 Rg8-d8 h3-h4 Be6xd5 e4xd5 Nc6-d4 h4xg5 Nd4xc2 Ra1-h1 a4-a3
10 00:00 236k 1,342k +0.32 Ke3-f2 Rg8-d8 Ra1-d1 a4-a3 Rd1-a1 Be6xd5 Nf6xd5 Nc6-d4 c2-c3 Nd4-c2 c3xb4+ Ka5-b5 Ra1-b1 a3xb2 Rb1xb2
11 00:00 297k 1,493k +0.12 Ke3-f2 Rg8-d8 c2-c3 Be6xd5 Nf6xd5 b4xc3 Nd5xc3 Rd8-d2+ Kf2-e1 Rd2xb2 Ra1xa4+ Ka5-b6 Ra4xc4 Rb2xg2 Nc3-d5+ Kb6-b5 Rc4-c3
12 00:00 690k 2,024k 0.00 Ke3-f2 Rg8-d8 Ra1-b1 Be6xd5 Nf6xd5 a4-a3 Rb1-a1 Ka5-a4 Kf2-e1 Rd8-d6 b2xa3 b4xa3 Nd5-c3+ Ka4-b4 Nc3-d5+ Kb4-a4
13 00:00 904k 2,168k 0.00 Ke3-f2 Rg8-d8 Ra1-b1 Be6xd5 Nf6xd5 a4-a3 b2xa3 b4xa3 Rb1-a1 Ka5-a4 Nd5-c3+ Ka4-b4 Nc3-d5+ Kb4-a4
14 00:00 1,139k 2,417k 0.00 Ke3-f2 Rg8-d8 Ra1-b1 Be6xd5 Nf6xd5 a4-a3 b2xa3 b4xa3 Rb1-a1 Ka5-a4 Nd5-c3+ Ka4-b4 Nc3-d5+ Kb4-a4
15 00:00 1,671k 2,911k 0.00 Ke3-f2 Rg8-d8 Ra1-b1 Be6xd5 Nf6xd5 a4-a3 b2xa3 b4xa3 Rb1-a1 Ka5-a4 Nd5-c3+ Ka4-b4 Nc3-d5+ Kb4-a4
16 00:00 2,242k 3,433k 0.00 Ke3-f2 Rg8-d8 Ra1-b1 Be6xd5 Nf6xd5 a4-a3 b2xa3 b4xa3 Rb1-a1 Ka5-a4 Nd5-c3+ Ka4-b4 Nc3-d5+ Kb4-a4
17 00:00 4,224k 4,784k 0.00 Ke3-f2 Rg8-d8 Ra1-b1 Be6xd5 Nf6xd5 a4-a3 b2xa3 b4xa3 Rb1-a1 Ka5-a4 Nd5-c3+ Ka4-b4 Nc3-d5+ Kb4-a4
18 00:01 9,098k 7,203k 0.00 Ke3-f2 Rg8-d8 Ra1-d1 a4-a3 b2xa3 b4xa3 Rd1-a1 Ka5-a4 Nd5-c3+ Ka4-b4 Nc3-d5+ Kb4-a4
19 00:01 10,825k 7,715k 0.00 Ke3-f2 Rg8-d8 Ra1-d1 a4-a3 b2xa3 b4xa3 Rd1-a1 Ka5-a4 Nd5-c3+ Ka4-b4 Nc3-d5+ Kb4-a4
20 00:01 15,532k 8,677k 0.00 Ke3-f2 Rg8-d8 Ra1-d1 a4-a3 b2xa3 b4xa3 Rd1-a1 Ka5-a4 Nd5-c3+ Ka4-b4 Nc3-d5+ Kb4-a4
21- 00:02 23,905k 8,596k -0.08 Ke3-f2 Rg8-d8 Ra1-d1 Be6xd5 e4xd5 Nc6-e5 d5-d6 b4-b3 Rd1-d5+ Ka5-b6 c2xb3 Ne5-d3+ Kf2-e2 a4xb3 Nf6xh7 Nd3xb2 Nh7xg5 Nb2-d3
21 00:03 29,677k 8,955k 0.00 Ke3-e2 Be6xd5 Nf6xd5 Ka5-b5 Ke2-f2 Rg8-d8 Ra1-d1 Kb5-c5 Rd1-a1 Kc5-b5
22 00:04 38,232k 9,373k 0.00 Ke3-e2 Be6xd5 Nf6xd5 Ka5-b5 Nd5-c7+ Kb5-b6 Nc7-d5+ Kb6-b5
23 00:04 43,470k 9,497k 0.00 Ke3-e2 Be6xd5 Nf6xd5 Ka5-b5 Nd5-c7+ Kb5-b6 Nc7-d5+ Kb6-b5
24 00:05 53,066k 9,818k 0.00 Ke3-e2 Be6xd5 Nf6xd5 Ka5-b5 Nd5-c7+ Kb5-b6 Nc7-d5+ Kb6-b5
25 00:07 78,960k 10,624k 0.00 Ke3-e2 Be6xd5 Nf6xd5 Ka5-b5 Nd5-c7+ Kb5-b6 Nc7-d5+ Kb6-b5
26 00:08 96,051k 10,818k 0.00 Ke3-e2 Be6xd5 Nf6xd5 Ka5-b5 Nd5-c7+ Kb5-b6 Nc7-d5+ Kb6-b5
27 00:14 174,440k 11,703k 0.00 Ke3-e2 Be6xd5 Nf6xd5 Ka5-b5 Nd5-c7+ Kb5-b6 Nc7-d5+ Kb6-b5
28- 00:18 218,967k 12,082k -0.08 Ke3-e2 Be6xd5 Nf6xd5 Nc6-d4+ Ke2-d2 Rg8-d8 Ra1-d1 b4-b3 c2-c3 Nd4-c2 Kd2-c1 Rd8-d6 e4-e5 Rd6-e6
28- 00:20 248,333k 12,212k -0.16 Ke3-e2 Be6xd5 Nf6xd5 Nc6-d4+ Ke2-d2 Rg8-d8 h3-h4 Nd4-f5 c2-c3 Nf5-e3 c3xb4+ Ka5-b5 h4xg5 Ne3xd5 e4xd5 Rd8xd5+ Kd2-c2 Kb5xb4
28- 00:24 299,791k 12,392k -0.32 Ke3-e2 Be6xd5 e4xd5 Nc6-d4+ Ke2-d2 Rg8-d8 Ra1-e1 Rd8-d6 Re1-e4 Rd6xf6 Re4xd4 Rf6-d6 Rd4xc4 Rd6xd5+ Kd2-c1 a4-a3 Rc4-c7 Ka5-b6 Rc7xh7 a3-a2 Rh7-h6+ Kb6-b5
28 00:47 595,245k 12,536k -0.04 Ke3-e2 Be6xd5 Nf6xd5 Nc6-d4+ Ke2-d1 Rg8-d8 c2-c3 b4xc3 b2xc3 Nd4-b3 Ra1-a2 Nb3-c5 Ra2-a1 Rd8-b8 Nd5-b4 Nc5-b3 Ra1-a2 Rb8-b7 Nb4-c6+ Ka5-b5 Nc6-b4 h7-h6 Kd1-c2 Nb3-c5 Ra2-a1 Rb7-a7 Nb4-d5 Nc5-d3 Ra1-b1+ Kb5-c5 Rb1-b6 h6-h5 Rb6-b1
29 00:57 724,103k 12,542k 0.00 Ke3-e2 Be6xd5 Nf6xd5 Nc6-d4+ Ke2-d1 Rg8-d8 c2-c3 b4xc3 b2xc3 Nd4-b3 Ra1-a2 Nb3-c5 Ra2-a1 Rd8-b8 Nd5-b4 Rb8-d8+ Nb4-d5
30- 01:14 943,308k 12,736k -0.08 Ke3-e2 Rg8-d8 Ra1-d1 b4-b3 Nd5-e7 Nc6-d4+ Rd1xd4 Rd8xd4 Ne7-c6+ Ka5-b6 Nc6xd4 a4-a3 Nd4xe6 a3xb2 Nf6-d7+ Kb6-b5 Ne6-d4+ Kb5-a5 Nd4-c6+ Ka5-a6
30- 01:17 990,754k 12,793k -0.16 Ke3-e2 Rg8-d8 Ra1-d1 b4-b3 c2xb3 c4xb3 Nf6xh7 Nc6-e5 Nh7xg5 Be6xd5 e4xd5 Rd8-c8 Ng5-e4 Rc8-c2+ Rd1-d2 a4-a3 b2xa3 b3-b2 Ne4-c3 Rc2xc3 Rd2xb2 Rc3-e3+ Ke2-f1 Re3xa3 Kf1-e2 Ra3-d3
30- 01:25 1,097,709k 12,887k -0.32 Ke3-e2 Rg8-d8 Ra1-d1 b4-b3 c2xb3 c4xb3 Nf6xh7 Nc6-e5 Nh7xg5 Be6xd5 e4xd5 Rd8-c8 Ng5-e4 Rc8-c2+ Rd1-d2 Ne5-c4 d5-d6 Nc4xd2 Ne4xd2 Ka5-b6 d6-d7 Kb6-c7
30 01:45 1,371,789k 12,965k -0.36 Ke3-e2 Rg8-d8 c2-c3 Be6xd5 Nf6xd5 b4xc3 Nd5xc3 Nc6-d4+ Ke2-f1 Ka5-b4 Ra1-a3 Nd4-c2 Nc3-d5+ Kb4-a5 Ra3-c3 Nc2-b4 Nd5xb4 Ka5xb4 Kf1-e1 Kb4-c5 Ke1-e2 Rd8-d7 Rc3-c2 Rd7-d3 Rc2-d2 Rd3-b3 Ke2-d1 c4-c3 Rd2-d5+ Kc5-c4 b2xc3 a4-a3 Rd5xg5 a3-a2
31 01:55 1,507,638k 13,039k -0.40 Ke3-e2 Rg8-d8 c2-c3 Be6xd5 Nf6xd5 b4xc3 Nd5xc3 Nc6-d4+ Ke2-f1 Ka5-b4 Ra1-a3 Nd4-c2 Nc3-d5+ Kb4-a5 Ra3-c3 Nc2-b4 Rc3xc4 Nb4xd5 Rc4-c5+ Ka5-b4 Rc5xd5 Rd8xd5 e4xd5 Kb4-c5 Kf1-e2 Kc5xd5 Ke2-d3 h7-h6 Kd3-c3 Kd5-c5 Kc3-d3 Kc5-b4 Kd3-c2 h6-h5 Kc2-d2 Kb4-c4 Kd2-c2 Kc4-d4 Kc2-d2 Kd4-c4
32- 02:35 2,075,055k 13,366k -0.64 Ke3-e2 Rg8-d8 c2-c3 Be6xd5 Nf6xd5 b4xc3 Nd5xc3 Nc6-d4+ Ke2-f1 Ka5-b4 Ra1-a3 Rd8-b8 Ra3xa4+
32 04:06 3,371,479k 13,672k -0.40 Ke3-e2 Rg8-d8 c2-c3 Be6xd5 Nf6xd5 b4xc3 Nd5xc3 Nc6-d4+ Ke2-f1 Ka5-b4 Ra1-a3 Rd8-b8 Kf1-f2 Nd4-c2 Ra3xa4+ Kb4-b3 Ra4-a5 Kb3xb2 Nc3-e2 h7-h6 h3-h4 Nc2-b4 h4xg5 Nb4-d3+ Kf2-g1 h6xg5 Ra5xg5 c4-c3 Ne2xc3 Kb2xc3 g2-g3 Rb8-b1+ Kg1-g2 Rb1-b2+ Kg2-f1 Rb2-f2+ Kf1-g1 Rf2xf3 g3xf4 Rf3xf4 e4-e5 Rf4-e4 Rg5-f5 Nd3xe5
33- 04:19 3,559,453k 13,696k -0.48 Ke3-e2 Rg8-d8 c2-c3 Be6xd5 Nf6xd5 b4xc3 Nd5xc3 Nc6-d4+ Ke2-f1 Ka5-b4 Ra1-a3 Rd8-b8 Kf1-f2 Nd4-c2 Ra3xa4+ Kb4-b3 Ra4-a5 Kb3xb2 Nc3-e2 h7-h6 h3-h4 Nc2-b4 h4xg5 Nb4-d3+ Kf2-g1
33- 04:40 3,843,897k 13,722k -0.56 Ke3-e2 Rg8-d8 Ra1-h1 Nc6-d4+ Ke2-d2 Nd4-b5 h3-h4 Be6xd5 e4xd5 g5xh4 Rh1xh4 a4-a3 b2xa3 b4xa3
33- 05:45 4,771,279k 13,826k -0.72 Ke3-e2 Rg8-d8 Ra1-h1 Nc6-d4+ Ke2-d2 Nd4-b5 h3-h4 Be6xd5 e4xd5 g5xh4 Rh1xh4 a4-a3 b2xa3 b4xa3 Rh4xh7 a3-a2
33 07:23 6,105,184k 13,778k -0.72 Ke3-e2 Rg8-d8 c2-c3 Be6xd5 Nf6xd5 b4xc3 Nd5xc3 Nc6-d4+ Ke2-f1 Ka5-b4 Ra1-a3 Rd8-b8 Kf1-f2 Nd4-c2 Ra3xa4+ Kb4-b3 Kf2-e2 Rb8-d8 e4-e5 Nc2-d4+ Ke2-e1 Rd8-e8 Ke1-d2 Re8xe5 Ra4-a7 Kb3xb2 Nc3-a4+ Kb2-b3 Na4-c3 Nd4-b5 Ra7-b7 Kb3-b4 Kd2-c2 h7-h6 Rb7-b6 h6-h5 Nc3-e4 h5-h4 Rb6-b8 Kb4-a5
34+ 07:49 6,463,595k 13,772k -0.40 Ke3-e2 Rg8-d8 c2-c3 Be6xd5 Nf6xd5
34 08:16 6,844,762k 13,793k -0.44 Ke3-e2 Rg8-d8 c2-c3 Be6xd5 Nf6xd5 b4xc3 Nd5xc3 Nc6-d4+ Ke2-f1 Ka5-b4 Ra1-a3 Rd8-b8 Kf1-f2 Nd4-c2 Ra3xa4+ Kb4-b3 Ra4-a5 Kb3xb2 Nc3-e2 h7-h6 h3-h4 Nc2-b4 h4xg5 Nb4-d3+ Kf2-g1 h6xg5 Ra5xg5 c4-c3 Ne2xc3 Kb2xc3 g2-g3 Kc3-d4 g3xf4 Kd4-e3 Kg1-g2 Ke3xf4 Rg5-g4+ Kf4-e3 e4-e5 Nd3-e1+ Kg2-g3 Ne1xf3 e5-e6 Rb8-e8 Rg4-c4 Nf3-d4 Rc4-c3+ Ke3-e4 Kg3-f2 Re8-f8+ Kf2-e1 Nd4xe6 Rc3-g3
35 10:20 8,622,166k 13,887k -0.44 Ke3-e2 Rg8-d8 c2-c3 Be6xd5 Nf6xd5 b4xc3 Nd5xc3 Nc6-d4+ Ke2-f1 Ka5-b4 Ra1-a3 Rd8-b8 Kf1-f2 Nd4-c2 Ra3xa4+ Kb4-b3 Ra4-a5 Kb3xb2 Nc3-e2 h7-h6 h3-h4 Nc2-b4 h4xg5 Nb4-d3+ Kf2-g1 h6xg5 Ra5xg5 c4-c3 Ne2xc3 Kb2xc3 g2-g3 Kc3-d4 g3xf4 Kd4-e3 Kg1-g2 Ke3xf4 Rg5-g4+ Kf4-e3 e4-e5 Nd3-e1+ Kg2-g3 Ne1xf3 e5-e6 Rb8-e8 Rg4-c4 Nf3-d4 Rc4-c3+ Ke3-e4 Kg3-f2 Re8-f8+ Kf2-e1 Nd4xe6 Rc3-g3 Ne6-d4 Rg3-g4+ Ke4-e5 Ke1-d2
36- 13:28 11,076,347k 13,705k -0.60 Ke3-e2 Rg8-d8 c2-c3 Be6xd5 Nf6xd5 b4xc3 Nd5xc3 Nc6-d4+ Ke2-f1 Ka5-b4 Ra1-a3 Rd8-b8 Kf1-f2 h7-h6 e4-e5 Kb4-c5 Nc3xa4+ Kc5-d5 Na4-c3+ Kd5xe5 Ra3-a5+
36 15:32 12,712,575k 13,635k -0.52 Ke3-e2 Rg8-d8 c2-c3 Be6xd5 Nf6xd5 b4xc3 Nd5xc3 Nc6-d4+ Ke2-f1 Ka5-b4 Ra1-a3 Rd8-b8 Kf1-f2 h7-h6 e4-e5 Kb4-c5 Nc3xa4+ Kc5-d5 Na4-c3+ Kd5xe5 Ra3-a5+ Ke5-e6 Ra5-a6+ Ke6-f7 Nc3-d1 Nd4-c2 Ra6-a7+ Kf7-g6 Ra7-a6+ Kg6-h5 Kf2-g1 Nc2-b4 Ra6-a4 Nb4-d3 Ra4xc4 Nd3xb2 Nd1xb2 Rb8xb2 Kg1-h2 Kh5-h4 Rc4-c6 h6-h5 Rc6-h6 Rb2-d2 Rh6-h7 Rd2-e2 Rh7-a7 Re2-b2
37- 16:57 13,777,697k 13,543k -0.60 Ke3-e2 Rg8-d8 c2-c3 Be6xd5 Nf6xd5 b4xc3 Nd5xc3 Nc6-d4+ Ke2-f1 Ka5-b4 Ra1-a3 Rd8-b8 Kf1-f2 h7-h6 e4-e5 Kb4-c5 Nc3xa4+ Kc5-d5 Na4-c3+ Kd5xe5 Ra3-a5+ Ke5-e6 Ra5-a6+ Ke6-f7 Ra6-a7+ Kf7-g6 Ra7-a6+ Kg6-h5 Ra6-a2 Nd4-f5 Nc3-d5 Kh5-h4 Nd5-f6 Nf5-e3 Nf6-e4 Kh4-h5 Ne4-c3 Kh5-h4 Kf2-g1 Rb8-b6 Kg1-f2
37 19:10 15,487,047k 13,465k -0.48 Ke3-e2 Rg8-d8 c2-c3 Be6xd5 Nf6xd5 b4xc3 Nd5xc3 Nc6-d4+ Ke2-f1 Ka5-b4 Ra1-a3 Rd8-b8 Kf1-f2 h7-h6 e4-e5 Kb4-c5 Nc3xa4+ Kc5-d5 Na4-c3+ Kd5xe5 Ra3-a5+ Ke5-e6 Ra5-a6+ Ke6-f7 Ra6-a7+ Kf7-g6 Nc3-d1 Rb8-b6 Ra7-d7 Nd4-c2 Kf2-f1 Kg6-h5 Rd7-d2 Nc2-b4 Rd2-d4 Nb4-d3 Rd4xc4 Nd3xb2 Nd1xb2 Rb6xb2 Kf1-g1 Kh5-h4 Kg1-h2 Rb2-d2 Rc4-c6 h6-h5 Rc6-c4 Rd2-b2 Rc4-e4 Rb2-a2 Re4-c4
38- 25:10 20,207,481k 13,382k -0.56 Ke3-e2 Rg8-d8 c2-c3 Be6xd5 Nf6xd5 b4xc3
38+ 29:19 23,445,611k 13,327k -0.40 Ke3-e2 Rg8-d8 c2-c3 Be6xd5 Nf6xd5 b4xc3 Nd5xc3 Ka5-b4 Ra1-a3
38 29:58 23,953,415k 13,320k -0.44 Ke3-e2 Rg8-d8 c2-c3 Be6xd5 Nf6xd5 b4xc3 Nd5xc3 Ka5-b4 Ra1-a3 Nc6-d4+ Ke2-f1 Rd8-b8 Kf1-f2 Nd4-c2 Ra3xa4+ Kb4-b3 Ra4-a5 Kb3xb2 Nc3-e2 h7-h6 h3-h4 Nc2-b4 h4xg5 Nb4-d3+ Kf2-g1 h6xg5 Ra5xg5 c4-c3 Ne2xc3 Kb2xc3 g2-g3 Kc3-d2 g3xf4 Kd2-e3 Kg1-g2 Ke3xf4 Rg5-g4+ Kf4-e3 Rg4-h4 Nd3-e1+ Kg2-g3 Ne1xf3 Rh4-g4 Nf3-e5 Rg4-g7 Ke3xe4 Kg3-g2 Ke4-d4
39 37:28 29,987,356k 13,335k -0.44 Ke3-e2 Rg8-d8 c2-c3 Be6xd5 Nf6xd5 b4xc3 Nd5xc3 Ka5-b4 Ra1-a3 Nc6-d4+ Ke2-f1 Rd8-b8 Kf1-f2 Nd4-c2 Ra3xa4+ Kb4-b3 Ra4-a5 Kb3xb2 Nc3-e2 h7-h6 h3-h4 Nc2-b4 h4xg5 Nb4-d3+ Kf2-g1 h6xg5 Ra5xg5 c4-c3 Ne2xc3 Kb2xc3 g2-g3 Kc3-d2 g3xf4 Kd2-e3 Kg1-g2 Ke3xf4 Rg5-g4+ Kf4-e3 Rg4-h4 Nd3-e1+ Kg2-g3 Ne1xf3 Rh4-g4 Nf3-e5 Rg4-g7 Ke3xe4 Kg3-g2 Ke4-d4 Kg2-f2 Ne5-d3+ Kf2-e2
40- 45:47 36,539,017k 13,301k -0.52 Ke3-e2 Rg8-d8 c2-c3 Be6xd5 Nf6xd5 b4xc3 Nd5xc3
40- 56:52 46,162,783k 13,527k -0.60 Ke3-e2 Rg8-d8 Ke2-e1 Nc6-d4 Nd5xb4 Ka5xb4 c2-c3+ Kb4-b3 c3xd4 Rd8xd4 Ra1-a3+ Kb3-c2 Ra3xa4 Rd4-d1+
40- 1:18:49 65,131,388k 13,772k -0.76 Ke3-e2 Rg8-d8
40- 2:14:22 110,319,512k 13,682k -1.09 Ke3-e2 Rg8-d8 Ra1-d1 b4-b3 c2xb3 c4xb3 Rd1-c1 Nc6-d4+
40- 3:59:38 199,499,263k 13,875k -1.73 Ke3-e2 Rg8-d8 Ke2-d2
40 4:35:52 229,609,488k 13,872k -1.53 Ke3-d2 Rg8-d8 Ra1-e1 h7-h6 c2-c3 b4-b3 Kd2-c1 Nc6-e5 Kc1-b1 a4-a3 Re1-d1 Ne5-d3 b2xa3 Ka5-a4

[Uri Blass]

stoickfish1.9.1 can avoid 28.Ra1 after more thasn one hour of search
[d]2b3r1/6pp/1kn2p2/7N/ppp1PN2/5P2/1PP2KPP/3R4 w - - 0 28


Stockfish-191-64-ja:
1 00:00 173 29k +0.76 Nf4-d5+
2 00:00 337 48k +0.88 Nf4-d5+ Kb6-b5 Nh5-f4
3 00:00 1k 151k +0.68 Nf4-d5+ Kb6-b5 Nh5-f4 Rg8-d8
4 00:00 3k 220k +0.56 Nf4-d5+ Kb6-b5 Nd5-e3 Bc8-a6 Ne3-d5
5 00:00 4k 303k +0.44 Nf4-d5+ Kb6-b5 Nd5-e3 Bc8-e6 Nh5-f4 c4-c3
6 00:00 20k 529k +0.56 Nf4-d5+ Kb6-b5 Rd1-a1 Bc8-d7 Kf2-e3 c4-c3 b2xc3 a4-a3 c3xb4 Nc6xb4
7- 00:00 51k 677k +0.36 Nf4-d5+ Kb6-b5 Rd1-a1 f6-f5 e4xf5 Bc8xf5 Nd5-e3 Bf5-g6
7 00:00 61k 686k +0.28 Nf4-d5+ Kb6-b5 Rd1-a1 f6-f5 Nh5-g3 c4-c3 b2xc3 f5xe4 Ng3xe4 Rg8-d8 Nd5xb4 Nc6xb4 c3xb4 Kb5xb4
8 00:00 110k 863k +0.08 Nf4-d5+ Kb6-b5 Rd1-a1 f6-f5 Nh5-g3 f5xe4 f3xe4 Rg8-f8+ Kf2-e3 Nc6-e5 h2-h3 Bc8-b7
9+ 00:00 282k 1,185k +0.44 Nf4-d5+ Kb6-b5 Kf2-e3 a4-a3 b2xa3 b4xa3 Rd1-a1 Kb5-a4 Nd5-c3+ Ka4-b4 Nc3-b1
9 00:00 380k 1,275k +0.68 Nf4-d5+ Kb6-b5 Kf2-e3 f6-f5 e4-e5 a4-a3 b2xa3 b4xa3 e5-e6 a3-a2 e6-e7 Kb5-c5 Nh5xg7 Nc6xe7 Nd5xe7 Rg8xg7 Ne7xc8 Rg7xg2
10 00:00 564k 1,442k +0.16 Nf4-d5+ Kb6-b5 Rd1-a1 f6-f5 h2-h3 f5xe4 f3xe4 Nc6-e5 Kf2-e3 c4-c3 b2xc3 g7-g6
11 00:02 2,003k 873k +0.52 Nf4-d5+ Kb6-b5 Nh5-f4 Rg8-d8 Nd5-c7+ Kb5-b6 Nf4-d5+ Kb6-c5 Rd1-a1 c4-c3 b2xc3 b4-b3 c2xb3 a4xb3 Ra1-b1 Nc6-a5 Kf2-e2
12 00:02 2,528k 924k +0.48 Nf4-d5+ Kb6-b5 Nh5-f4 Rg8-d8 Rd1-a1 Rd8-d7 Nf4-e2 Rd7-a7 c2-c3 b4-b3 Ra1-a3 Kb5-c5 Kf2-e3 Bc8-e6 Ne2-f4 Be6-f7
13 00:03 3,059k 865k +0.44 Nf4-d5+ Kb6-b5 Nh5-f4 Rg8-d8 Nd5-c7+ Kb5-b6 Nf4-d5+ Kb6-c5 Rd1-a1 c4-c3 b2xc3 b4-b3 c2xb3 a4xb3 Kf2-e3 b3-b2 Ra1-b1 Nc6-e5 Ke3-d2 Ne5-c4+ Kd2-d3 f6-f5 h2-h3 f5xe4+ f3xe4
14+ 00:04 3,243k 739k +0.52 Nf4-d5+ Kb6-b5 Nh5-f4 Rg8-d8 Nd5-c7+ Kb5-b6 Nf4-d5+ Kb6-c5 Rd1-a1 c4-c3 b2xc3 b4-b3 c2xb3 a4xb3 Kf2-e3 b3-b2 Ra1-b1 Nc6-e5 Ke3-e2 Ne5-c4 Nd5-e3
14- 00:04 3,426k 750k +0.36 Nf4-d5+ Kb6-b5 Nh5-f4 Rg8-d8 Nd5-c7+ Kb5-b6 Nf4-d5+ Kb6-c5 Rd1-a1 c4-c3 b2xc3 b4-b3 c2xb3 a4xb3 Kf2-e3 Kc5-c4 Nd5-b6+ Kc4-c5 Nc7-d5 Bc8-e6 Ra1-b1
14 00:04 3,657k 737k +0.44 Nf4-d5+ Kb6-b5 Nh5-f4 Rg8-d8 Nd5-c7+ Kb5-b6 Nf4-d5+ Kb6-c5 Rd1-a1 b4-b3 c2xb3 a4xb3 Kf2-e3 f6-f5 Ra1-a8 f5xe4 f3xe4 Bc8-d7 Ra8xd8 Nc6xd8 h2-h3
15+ 00:05 3,777k 732k +0.52 Nf4-d5+ Kb6-b5 Nh5-f4 Rg8-d8 Nd5-c7+ Kb5-b6 Nf4-d5+ Kb6-c5 Rd1-a1 b4-b3 c2xb3 a4xb3 Kf2-e3 f6-f5 Ra1-a8 f5xe4 f3xe4 Bc8-d7 Ra8xd8 Nc6xd8 Nc7-a6+ Kc5-d6 Ke3-d4
15+ 00:06 5,041k 770k +0.60 Nf4-d5+ Kb6-b5 g2-g4 a4-a3 b2xa3 b4xa3 Rd1-a1 Kb5-a4 Nd5-c3+ Ka4-b4 Nc3-b1
15 00:11 6,782k 611k +0.44 Nf4-d5+ Kb6-b5 g2-g4 Kb5-c5 Rd1-a1 b4-b3 c2xb3 a4xb3 Kf2-e3 Bc8-e6 Nh5-f4 Be6-d7 Nf4-e2 Bd7-e6 Ra1-d1 Rg8-a8 Ne2-f4 Be6xd5 e4xd5
16- 00:14 8,582k 580k +0.36 Nf4-d5+ Kb6-b5 g2-g4 Kb5-c5 Rd1-a1 b4-b3 c2xb3 a4xb3 Kf2-e3 Bc8-e6 Nh5-f4 Be6-f7 h2-h4 g7-g5 h4xg5 f6xg5
16 00:15 9,174k 595k +0.40 Nf4-d5+ Kb6-b5 g2-g4 Kb5-c5 Rd1-a1 b4-b3 c2xb3 a4xb3 Nh5-f4 Nc6-e5 Ra1-a5+ Kc5-d6 Ra5-a8 Rg8-e8 Kf2-e3 Bc8-d7 Ra8-a1 Bd7-c6 Ra1-a7 g7-g5
17+ 00:15 10,393k 652k +0.48 Nf4-d5+ Kb6-b5 g2-g4 Kb5-c5 Rd1-a1 b4-b3 c2xb3 a4xb3 Nh5-f4 Nc6-e5 Ra1-a7 Bc8-d7 Kf2-e2 Kc5-d4 Nd5-e7 Rg8-e8 Ne7-f5+ Bd7xf5 g4xf5 c4-c3 Nf4-e6+ Kd4-c4 Ra7-c7+
17 00:16 10,978k 678k +0.52 Nf4-d5+ Kb6-b5 g2-g4 Kb5-c5 Rd1-a1 b4-b3 c2xb3 a4xb3 Nh5-f4 Bc8-d7 Kf2-e3 Nc6-e5 Ra1-a5+ Kc5-d6 Ra5-a7 Rg8-d8 h2-h4 Kd6-c5 h4-h5 Ne5-c6 Ra7-c7
18- 00:17 19,938k 1,147k +0.36 Nf4-d5+ Kb6-b5 g2-g4 Kb5-c5 Rd1-a1 b4-b3 c2xb3 a4xb3 Nh5-f4 Bc8-b7 Kf2-e3 Nc6-e5 Nd5-e7 Rg8-e8
18 00:17 21,900k 1,248k +0.40 Nf4-d5+ Kb6-b5 g2-g4 Kb5-c5 Rd1-a1 b4-b3 c2xb3 a4xb3 Nh5-f4 Bc8-b7 Kf2-e3 Nc6-e5 Ra1-a5+ Kc5-d6 Nd5-c3 Bb7-c6 Ra5-a7 Bc6-d7 Nc3-d5 Rg8-d8 h2-h4 Kd6-c5 h4-h5 Ne5-c6 Ra7-b7 Nc6-d4 Rb7-c7+ Nd4-c6 h5-h6
19- 00:19 47,944k 2,466k +0.20 Nf4-d5+ Kb6-c5 c2-c3 f6-f5 c3xb4+ Nc6xb4 Nd5-e7 Rg8-e8 Ne7xf5 Nb4-d3+ Kf2-g1 Bc8xf5 Nh5xg7 Re8-e5 Ng7xf5 Nd3xb2
19- 00:22 95,543k 4,170k 0.00 Nf4-d5+ Kb6-c5 Rd1-a1 Bc8-e6 Ra1xa4 Be6xd5 e4xd5 Kc5xd5 Nh5-f4+ Kd5-e5 Ra4-a6 Rg8-c8 Kf2-e3 Ke5-d6 Nf4-h5 Rc8-e8+ Ke3-d2 Re8-e7 Nh5-f4 Kd6-c5
19 00:23 96,902k 4,209k +0.32 Rd1-a1 Kb6-b5 Kf2-e3 f6-f5 Nf4-d5 f5xe4 f3xe4 Bc8-d7 Nh5-f4 Nc6-e5 Nf4-e6 Bd7xe6 Nd5-c7+ Kb5-c5 Nc7xe6+ Kc5-d6 Ne6-d4 Rg8-a8 Nd4-f5+ Kd6-c6 Ke3-d4 c4-c3 b2xc3
20 00:25 110,277k 4,341k +0.32 Rd1-a1 Kb6-b5 Kf2-e3 Bc8-d7 Nf4-d5 Nc6-e5 Ra1-d1 b4-b3 Ke3-d2 Bd7-c6 Nh5-f4 Bc6xd5 Nf4xd5 Rg8-d8 Kd2-c3 b3xc2 Kc3xc2 Ne5-d3 Nd5-c3+ Kb5-b4 Rd1-a1 Rd8-a8 Nc3-d5+ Kb4-c5 Nd5-c7 Ra8-a7 Nc7-e6+ Kc5-d6
21- 00:25 115,972k 4,484k +0.24 Rd1-a1 Kb6-b5 Kf2-e3 f6-f5 Nf4-d5 f5xe4 f3xe4 Bc8-d7 h2-h3 Nc6-e5 Ra1-d1 c4-c3 b2xc3 b4-b3 c2xb3 a4xb3 Ke3-d4 Ne5-c6+ Kd4-d3 Nc6-e5+
21+ 00:26 122,470k 4,643k +0.40 Rd1-a1 Kb6-b5 Kf2-e3 f6-f5 Nf4-d5 f5xe4 f3xe4 Bc8-d7 h2-h3 Nc6-e5 Ra1-d1 c4-c3 b2xc3 b4-b3 c2xb3 a4xb3 Ke3-d4 Ne5-c6+ Kd4-d3 Nc6-e5+ Kd3-e3 b3-b2 Ke3-d4 Ne5-c6+ Kd4-d3 Kb5-c5 Rd1-b1
21 00:26 127,032k 4,749k +0.28 Rd1-a1 Kb6-b5 Kf2-e3 Nc6-e5 Nf4-d5 Bc8-d7 Ra1-d1 b4-b3 Ke3-d2 Kb5-c5 c2xb3 c4xb3 Nh5-f4 Kc5-b5 Nd5-c7+ Kb5-c5 h2-h3 Kc5-d6 Nc7-d5 Rg8-e8 Kd2-c3 Re8-c8+ Kc3-d4 Bd7-b5
22+ 00:27 134,497k 4,917k +0.36 Rd1-a1 Kb6-b5 Kf2-e3 Nc6-e5 Nf4-d5 Bc8-d7 Ra1-d1 a4-a3 b2xa3 b4xa3 Rd1-a1 Kb5-a4 Ke3-d4
22- 00:27 142,995k 5,107k +0.20 Rd1-a1 Kb6-b5 Kf2-e3 Nc6-e5 Nf4-d5 Bc8-d7 Ra1-d1 b4-b3 Ke3-d2 Kb5-c5 c2xb3 c4xb3 h2-h3 Kc5-b5 Nd5-c7+ Kb5-c6 Rd1-c1+ Kc6-d6 f3-f4 Ne5-g6 f4-f5 Ng6-h4
22 00:29 160,093k 5,465k +0.32 Rd1-a1 Kb6-b5 Kf2-e3 Nc6-e5 Nf4-d5 Bc8-d7 Ra1-d1 b4-b3 Ke3-d2 Kb5-c5 c2xb3 c4xb3 Nh5-f4 Kc5-b5 Nd5-c7+ Kb5-c5 h2-h3 Kc5-d6 Nc7-d5 Rg8-d8 Nd5-e3 Rd8-c8 Kd2-e2+ Kd6-c5 Rd1-d5+ Kc5-b6 Rd5-d6+ Kb6-c5
23- 00:31 178,173k 5,674k +0.24 Rd1-a1 Kb6-b5 Kf2-e3 Nc6-e5 Nf4-d5 Bc8-d7 Ra1-d1 Kb5-c5 c2-c3 b4xc3 Nd5xc3 Kc5-b4 Nc3-d5+ Kb4-c5 Rd1-b1 Ne5-d3 Nd5-e7 Rg8-e8
23- 00:36 235,337k 6,532k +0.16 Rd1-a1 Kb6-b5 Nf4-d5 Nc6-d4 c2-c3 Nd4-c2 Ra1-c1 b4-b3 Nd5-e7 Rg8-f8 Ne7xc8 Rf8xc8 Nh5xg7 a4-a3
23 00:44 341,158k 7,704k +0.24 Rd1-a1 Kb6-b5 Kf2-e3 Bc8-d7 Nf4-d5 Nc6-e5 h2-h3 Kb5-c5 Ra1-d1 Bd7-e6 f3-f4 Ne5-c6 g2-g4 a4-a3 b2xa3 b4xa3 Nh5xf6 g7xf6 Nd5xf6 Rg8-g7
24 00:46 365,476k 7,899k +0.24 Rd1-a1 Kb6-b5 Kf2-e3 Bc8-d7 Nf4-d5 Nc6-e5 h2-h3 Kb5-c5 Nh5-f4 Rg8-c8 Ke3-d2 Rc8-b8 h3-h4 c4-c3+ b2xc3 Ne5-c4+ Kd2-e2 b4-b3 Nf4-d3+ Kc5-d6 c2xb3 Rb8xb3 h4-h5 a4-a3 h5-h6 g7xh6 Nd5xf6 Rb3xc3 e4-e5+ Kd6-e6 Nd3-c5+
25- 00:50 419,419k 8,295k +0.16 Rd1-a1 Kb6-b5 Kf2-e3 Bc8-d7 Nf4-d5 Nc6-e5 h2-h3 Kb5-c5 Nh5-f4 Rg8-c8 Ke3-d2 Rc8-b8 h3-h4 c4-c3+ b2xc3 Ne5-c4+ Kd2-e2 b4-b3 Nf4-d3+ Kc5-d6 c2xb3 Rb8xb3 h4-h5 f6-f5 Nd3-b4 f5xe4 f3xe4 Kd6-e5
25 00:55 487,747k 8,713k +0.16 Rd1-a1 Kb6-b5 Kf2-e3 Bc8-d7 Nf4-d5 Nc6-e5 h2-h3 Kb5-c5 Nh5-f4 Rg8-c8 Ke3-d2 Rc8-b8 h3-h4 c4-c3+ b2xc3 Ne5-c4+ Kd2-e2 b4-b3 Nf4-d3+ Kc5-d6 c2xb3 Rb8xb3 Ra1-a2 f6-f5 Nd3-b4 f5xe4 f3xe4 Rb3-b1 Ke2-d3 Nc4-e5+ Kd3-e3
26- 01:01 565,652k 9,152k +0.08 Rd1-a1 Kb6-b5 Kf2-e3 Bc8-d7 Nf4-d5 Nc6-e5 h2-h3 Kb5-c5 Nh5-f4 Rg8-a8 Nd5-c7 Ra8-a7 Nc7-d5 a4-a3
26+ 01:18 781,966k 10,001k +0.24 Rd1-a1 Kb6-b5 Kf2-e3 Rg8-d8 Nh5xg7 Nc6-d4 Ra1-c1 a4-a3 b2xa3
26- 01:23 856,339k 10,222k 0.00 Rd1-a1 Kb6-b5 Kf2-e3 Bc8-d7 Nf4-d5 Nc6-e5 c2-c3 b4xc3 Nd5xc3+ Kb5-b4 Nh5-f4 Kb4-b3 Ke3-d2 Rg8-c8 Ra1-b1 Ne5-d3 Nf4xd3 c4xd3 Kd2xd3 Rc8-d8 Nc3-d5 Bd7-c6 Kd3-d4 Kb3-c2
26 01:49 1,195,384k 10,905k +0.04 Rd1-a1 Kb6-b5 Kf2-e3 Bc8-d7 Nf4-d5 Nc6-e5 c2-c3 b4xc3 Nd5xc3+ Kb5-b4 Nh5-f4 Kb4-b3 Ke3-d2 Rg8-c8 Ra1-b1 Ne5-d3 Nf4xd3 c4xd3 Rb1-a1 Bd7-e8 g2-g3 Be8-d7 Kd2xd3 Rc8-d8 Kd3-d2 Kb3xb2 Ra1-b1+ Kb2-a3 Kd2-c2 Bd7-c6 g3-g4 Rd8-c8 Kc2-d3 Bc6-d7 Kd3-d4
27+ 01:54 1,259,655k 10,990k +0.20 Rd1-a1 Kb6-b5 Kf2-e3 Bc8-d7 Nf4-d5 Nc6-e5 c2-c3 b4xc3 b2xc3 Ne5-d3 Nd5-e7 Rg8-e8 Ra1-b1+ Kb5-c5 Ne7-d5 Re8-g8 g2-g4 Nd3-e5 Rb1-a1 Kc5-b5 Nh5-f4 Rg8-d8 h2-h3 Rd8-g8 Nf4-e6 Bd7xe6 Nd5-c7+ Kb5-c5 Nc7xe6+ Kc5-d6 Ne6-d4
27 01:57 1,292,195k 11,020k 0.00 Rd1-a1 Kb6-b5 Kf2-e3 Bc8-d7 Nf4-d5 Nc6-e5 c2-c3 b4xc3 b2xc3 Ne5-d3 Nd5-e7 Rg8-e8 Ra1-b1+ Kb5-c5 Ne7-d5 Re8-g8 g2-g4 Nd3-e5 Rb1-a1 Kc5-b5 Nh5-f4 Rg8-d8 h2-h3 h7-h6 Nf4-h5 Rd8-g8 f3-f4 Ne5-d3 f4-f5 Nd3-c5 Ra1-b1+ Nc5-b3 Rb1-d1 Nb3-c5 Nh5xf6 g7xf6 Nd5xf6 Rg8-g7 e4-e5
28+ 02:12 1,492,451k 11,276k +0.12 Rd1-a1 Kb6-b5 Nf4-d5 Nc6-d4 c2-c3 Nd4-c2 Ra1-d1 b4-b3 Nd5-e7 Rg8-e8 Ne7-f5 Bc8xf5 e4xf5 Re8-e7
28 02:27 1,698,726k 11,501k 0.00 Rd1-a1 Kb6-b5 Kf2-e3 Bc8-d7 Nf4-d5 Nc6-e5 c2-c3 b4xc3 b2xc3 Ne5-d3 Nd5-e7 Rg8-e8 Ra1-b1+ Kb5-c5 Ne7-d5 Re8-g8 g2-g4 Nd3-e5 Rb1-b7 Rg8-a8 Nh5xg7
29+ 02:43 1,899,908k 11,637k +0.08 Rd1-a1 Kb6-b5 Kf2-e3 Bc8-d7 Nf4-d5 Nc6-e5 Ke3-d2 Kb5-c5 c2-c3 b4xc3+ Kd2xc3 Ne5-d3 Nd5xf6 g7xf6 Nh5xf6 Rg8xg2 Nf6xd7+ Kc5-b5 Ra1-b1
29+ 02:54 2,043,990k 11,739k +0.16 Rd1-a1 Kb6-b5 Kf2-e3 Bc8-d7 Nf4-d5 Nc6-e5 c2-c3 b4xc3 b2xc3 Kb5-c5 Ra1-b1 Bd7-c6 Nd5-c7 Kc5-d6 Nc7-a6 h7-h6 Nh5-f4 Rg8-d8 Rb1-d1+ Kd6-e7 Rd1xd8 Ke7xd8 Nf4-e6+ Kd8-e7 Ne6xg7
29 03:04 2,180,240k 11,838k 0.00 Rd1-a1 Kb6-b5 Kf2-e3 Bc8-d7 Nf4-d5 Nc6-e5 c2-c3 b4xc3 b2xc3 Kb5-c5 Ra1-b1 Ne5-d3 g2-g4 Nd3-e5 Rb1-b6 h7-h6 Rb6-b7 Rg8-a8 Rb7-b1 Ra8-g8 Rb1-a1 Bd7-c6 Nd5-b4 Bc6-b5 Nb4-d5 Kc5-d6 Nd5-b4 Kd6-c5
30+ 03:19 2,377,281k 11,944k +0.08 Rd1-a1 Kb6-b5 Kf2-e3 c4-c3 b2xc3 b4xc3 Nf4-d5
30+ 03:28 2,495,272k 11,988k +0.16 Rd1-a1 Kb6-b5 Kf2-e3 c4-c3 b2xc3 b4xc3 Nf4-d5
30 04:05 2,982,405k 12,148k +0.28 Rd1-a1 Kb6-b5 Kf2-e3 Bc8-d7 Nf4-d5 f6-f5 Ra1-d1 Bd7-c8 Nh5-f4 Kb5-c5 Nd5-c7 f5xe4 f3xe4 a4-a3 b2xa3 b4xa3 c2-c3 g7-g5 Nf4-d5 Rg8-f8 Rd1-a1 Nc6-e5 h2-h3 g5-g4 Ra1xa3 g4xh3 Ra3-a5+ Kc5-c6 g2xh3 Bc8xh3 Nc7-b5 h7-h5 Ke3-d4
31- 06:41 5,035,228k 12,535k 0.00 Rd1-a1 Kb6-b5 Kf2-e3 Bc8-d7 Nf4-d5 Bd7-e8 Nh5-g3
31 07:51 5,958,690k 12,627k 0.00 Rd1-a1 Kb6-b5 Kf2-e3 Bc8-d7 Nf4-d5 Bd7-e8 g2-g4 Be8-f7 Nh5-f4 Bf7xd5 Nf4xd5 Rg8-b8 Nd5-c7+ Kb5-b6 Nc7-d5+ Kb6-b5
32 09:43 7,413,899k 12,699k 0.00 Rd1-a1 Kb6-b5 Kf2-e3 Bc8-d7 Nf4-d5 Bd7-e8 Nd5-c7+ Kb5-a5 Nc7xe8 Rg8xe8 Nh5-f4 c4-c3 b2xc3 b4xc3 Ra1-c1 Nc6-b4 Ke3-d4 a4-a3 Nf4-d5 a3-a2 Kd4xc3 Re8-c8+ Kc3-b3 Nb4xc2 Kb3xa2 Nc2-b4+ Ka2-b1 Rc8xc1+ Kb1xc1 Nb4xd5 e4xd5 Ka5-b5 Kc1-d2 Kb5-c5 Kd2-d3 Kc5xd5 f3-f4 h7-h5 g2-g3 f6-f5
33 11:54 8,969,512k 12,557k 0.00 Rd1-a1 Kb6-b5 Kf2-e3 Bc8-d7 Nf4-d5 Bd7-e8 Nd5-c7+ Kb5-a5 Nc7xe8 Rg8xe8 Nh5-f4 c4-c3 b2xc3 b4xc3 Ra1-c1 Nc6-b4 Ke3-d4 a4-a3 Nf4-d5 a3-a2 Kd4xc3 Re8-c8+ Kc3-b3 Nb4xc2 Kb3xa2 Nc2-b4+ Ka2-b1 Rc8xc1+ Kb1xc1 Nb4xd5 e4xd5 Ka5-b5 Kc1-d2 Kb5-c5 Kd2-d3 Kc5xd5 f3-f4 h7-h5 g2-g3 f6-f5 Kd3-e3 Kd5-c5 Ke3-f3
34 17:56 13,465,512k 12,512k 0.00 Rd1-a1 Kb6-b5 Kf2-e3 Bc8-d7 Nf4-d5 Bd7-e8 Nh5-f4 Be8-f7 h2-h4 Rg8-b8 Nd5-c7+ Kb5-a5 Nc7-d5 Ka5-b5
35 21:58 16,626,694k 12,606k 0.00 Rd1-a1 Kb6-b5 Kf2-e3 Bc8-d7 Nf4-d5 Bd7-e8 Nh5-f4 Be8-f7 h2-h4 Rg8-b8 Nd5-c7+ Kb5-a5 Nc7-d5 Ka5-b5
36 26:20 20,188,032k 12,773k 0.00 Rd1-a1 Kb6-b5 Kf2-e3 Bc8-d7 Nf4-d5 Bd7-e8 Nh5-f4 Be8-f7 h2-h4 Rg8-b8 Nd5-c7+ Kb5-a5 Nc7-d5 Ka5-b5
37 39:29 31,075,789k 13,118k 0.00 Rd1-a1 Kb6-b5 Kf2-e3 Bc8-d7 Nf4-d5 Bd7-e8 Nh5-f4 Be8-f7 h2-h4 Rg8-b8 Nd5-c7+ Kb5-a5 Nc7-d5 Ka5-b5
38- 54:52 43,927,327k 13,340k -0.08 Rd1-a1 Kb6-b5 Kf2-e3 Bc8-d7 Nf4-d5 Bd7-e8 Nh5-f4 Be8-f7 h2-h4 Rg8-b8 Nd5-c7+ Kb5-a5 Nc7-d5
38 1:12:17 59,009,581k 13,603k 0.00 Nf4-d5+ Kb6-c5 Rd1-a1 Bc8-e6 Ra1xa4 Be6xd5 e4xd5 Kc5xd5 Nh5-f4+ Kd5-e5 Ra4-a6 Rg8-c8 Nf4-e2 Ke5-d5 Ne2-f4+ Kd5-e5
39 1:51:36 92,329,953k 13,787k 0.00 Nf4-d5+ Kb6-c5 Rd1-a1 Bc8-e6 Ra1xa4 Be6xd5 e4xd5 Kc5xd5 Nh5-f4+ Kd5-e5 Ra4-a6 Rg8-c8 Nf4-e2 Ke5-d5 Ne2-f4+ Kd5-e5
40 2:59:22 149,827,873k 13,921k 0.00 Nf4-d5+ Kb6-c5 Rd1-a1 Bc8-e6 Ra1xa4 Be6xd5 e4xd5 Kc5xd5 Nh5-f4+ Kd5-e5 Ra4-a6 Rg8-c8 Nf4-e2 Ke5-d5 Ne2-f4+ Kd5-e5