Stockfish Development Version: Finds Mate Much Quicker...

[Kooper]

Update:

Last time Stockfish 220731 Michael Chaly with default NNUE chose the f5 move and couldn't win against Stockfish 220616 ppigazzini without NNUE, but Fisherov Monk 1.2 with default NNUE also chose the f5 move and managed to win against the Stockfish 220616 ppigazzini without NNUE. However Fisherov's engine is private.

With NNUE turned on, Fisherov still has a good balance between both nnue and classical evaluations, with only just a few times missed the classical advantages which could be improved.

[pgn][White "Fisherov chess monk 1.2"]
[Black "Stockfish 160622 No Nnue"]
[Result "1-0"]
[SetUp "1"]
[FEN "b5kb/bb5b/4q3/2P5/3P1PPb/2N2PbR/PP1QB3/R1B2K2 w - -"]

1. f5 Bxf5 {+1.76/25 12s} 2. Rxh4 {+1.91/23 19s} Bxh4
{+0.77/21 8s} 3. gxf5 {+1.95/26 7s} Qxf5 {+1.15/24 16s}
4. Bc4+ {+1.92/22 8s} Bd5 {+1.20/27 12s} 5. Qg2+ {+2.06/23
7s} Kf7 {+1.37/24 8s} 6. Nxd5 {+2.27/30 29s} Bxd5 {+1.54/24
8s} 7. Bxd5+ {+2.57/21 8s} Qxd5 {+1.04/23 13s} 8. Qg4
{+2.63/23 10s} Bxd4 {+1.37/23 14s} 9. Kg2 {+2.20/25 21s}
Bhf6 {+1.46/24 8s} 10. c6 {+2.14/23 9s} Qxc6 {+1.25/26 29s}
11. Qh5+ {+2.07/22 8s} Ke7 {+1.75/27 22s} 12. Qf5 {+2.36/25
18s} Qb6 {+1.23/23 20s} 13. Kh3 {+2.31/22 8s} Qd6 {+0.99/20
6s} 14. Bh6 {+2.30/24 13s} Bb8 {+1.63/29 25s} 15. Re1+
{+2.54/22 8s} Kd8 {+1.54/26 7s} 16. f4 {+2.88/24 9s} Qc6
{+1.72/27 26s} 17. Re4 {+2.86/19 8s} Bxb2 {+1.65/26 12s}
18. Qe6 {+2.74/26 31s} Qxe6+ {+1.41/21 6s} 19. Rxe6
{+2.58/28 16s} Kd7 {+2.25/28 21s} 20. f5 {+2.59/24 12s}
Bbc3 {+1.37/30 20s} 21. Kg4 {+2.67/25 10s} Be7 {+1.26/29
4s} 22. Kf3 {+2.92/28 22s} Ke8 {+2.25/25 19s} 23. Rc6
{+3.74/22 13s} Bbe5 {+2.45/24 7s} 24. Ke4 {+4.08/21 10s}
Kf7 {+2.47/24 5s} 25. Be3 {+4.26/21 11s} Bd8 {+2.54/23 5s}
26. Rc5 {+4.87/23 8s} Bef6 {+3.50/25 39s} 27. Rb5 {+5.26/23
10s} Ke8 {+3.40/20 3s} 28. Kd5 {+5.39/25 33s} Kd7 {+2.93/21
6s} 29. Rb7+ {+5.40/22 6s} Bc7 {+4.10/20 14s} 30. a4
{+7.70/25 19s} Bfe5 {+3.48/17 0s} 31. Bg5 {+8.03/19 3s} Kc8
{+6.03/19 11s} 32. Kc6 {+8.60/22 3s} Bf4 {+7.03/18 7s}
33. Be7 {+9.26/24 3s} Bc7e5 {+5.09/15 1s} 34. Rd7
{+14.06/18 4s} Bc7 {+20.53/19 9s} 35. f6 {+18.24/17 4s} Bb6
{+50.52/26 6s} 36. f7 {+18.87/18 5s} Bg7 {+50.52/24 1s}
37. f8=Q+ {+50.86/26 18s} Bxf8 {+50.35/25 7s} 38. Bxf8
{+57.73/25 2s} Bf2 {+49.63/28 8s} 39. Rb7 {+M51/28 3s} Kd8
{+M26/30 6s} 40. Rf7 {+M38/28 3s} B2e3 {+M26/28 3s} 41. Bb4
{+M33/29 4s} Bh6 {+M23/27 1s} 42. Rd7+ {+M22/30 5s} Ke8
{+M23/28 4s} 43. Re7+ {+M18/31 8s} Kd8 {+M17/28 4s} 44. Re6
{+M8/60 3s} Bd2 {+M7/56 2s} 45. Bc5 {+M7/63 4s} Ba5 {+M6/61
2s} 46. Rxh6 {+M6/68 4s} Bc3 {+M5/67 3s} 47. Re6 {+M5/90
4s} Ba5 {+M4/183 3s} 48. Rf6 {+M4/245 1s} Kc8 {+M3/245 0s}
49. Rf8+ {+M3/245 0s} Bd8 {+M2/245 0s} 50. Re8 {+M2/245 0s}
Kb8 {+M1/245 0s} 51. Rxd8# {+M1/245 0s} 1-0[/pgn]

[Kooper]

Example of a missed difficult move.


[fen]8/4bk2/4R3/8/3b1P2/2b2K2/P7/2B5 w - - [/fen]


The winning move is Ra6 but Fisherov and most other engines missed it and choose Rc6 or f5
which lead to draw against Stockfish 220616 ppigazzini without NNUE.