[d]8/1K6/3Q3p/4n1b1/5k2/4p3/8/3B4 b - -
Code: Select all
Engine: Crafty NNUE 25.6.1 (1024 MB)
gemaakt door Robert Hyatt and the Crafty team; UCI a
11/29 0:01 +5.21 20...h5 21.Lxh5 Kf5 22.Ka6 Lh4
23.Ld1 Lg3 24.Df8+ Ke4 25.Dc8 Pd7
26.Db7+ Ke5 (1.370.881) 725
12/29 0:02 +5.48 20...h5 21.Dd4+ Kf5 22.Lc2+ Ke6
23.De4 e2 24.Dxe2 h4 25.De4 h3
26.Df5+ Kd6 27.Lb3 Pd3 28.De6+ Kc5 (1.756.184) 711
12/32 0:03 +5.48 20...h5 21.Dd4+ Kf5 22.Lc2+ Ke6
23.De4 e2 24.Dxe2 h4 25.De4 h3
26.Df5+ Kd6 27.Lb3 Pd3 28.De6+ Kc5 (2.472.696) 751
13/32 0:03 +5.49 20...h5 21.Dd4+ Kf5 22.Lc2+ Ke6
23.De4 e2 24.Dxe2 Lf6 25.Dxh5 Kd6
26.Lb3 Kc5 27.De8 Kb4 28.Da4+ Kc3 (2.838.866) 735
14/32 0:04 +5.58 20...h5 21.Dd4+ Kf5 22.Lc2+ Ke6
23.De4 e2 24.Dxe2 h4 25.De4 Ke7
26.Db4+ Ke6 27.Lb3+ Kf6 28.Df8+ Kg6
29.Lc2+ Kh5 30.Lb1 (3.248.565) 731
15/32 0:06 +5.84 20...h5 21.Dd4+ Kf5 22.Lc2+ Ke6
23.De4 Lh6 24.Df5+ Kd5 25.Ld1 Kd4
26.Df6 (4.406.972) 717
16/36 0:11 +6.25 20...h5 21.Dd4+ Kf5 22.Lc2+ Ke6
23.De4 e2 24.Dxe2 h4 25.Df2 Pf7
26.Lb3+ Ke5 27.Lxf7 Lf4 28.Db2+ Ke4
29.Lg6+ Kf3 30.Dc3+ Kg2 31.Ld3 (7.715.019) 666
17/36 0:13 +6.25 20...h5 21.Dd4+ Kf5 22.Lc2+ Ke6
23.De4 e2 24.Dxe2 Lf6 25.Lb3+ Kf5
26.Dxh5+ Kf4 27.Le6 Lg5 28.Dh2+ Ke4
29.Dg2+ Pf3 30.Lg4 Lf4 31.Dc2+ Kd4
32.Df2+ Ke5 33.De2+ Kf6 (9.016.371) 671
18/38 0:21 +6.75 20...h5 21.Dd4+ Kf5 22.Lc2+ Ke6
23.De4 e2 24.Dxe2 Lf6 25.Dxh5 Kd5
26.Lb3+ Ke4 27.Dh7+ Kf4 28.Le6 Pg4
29.Df5+ Ke3 30.Dxg4 Lc3 31.Dg5+ Kd3
32.Ld5 (14.706.944) 693
18/38 0:25 +6.75 20...h5 21.Dd4+ Kf5 22.Lc2+ Ke6
23.De4 e2 24.Dxe2 Lf6 25.Dxh5 Kd5
26.Lb3+ Ke4 27.Dh7+ Kf4 28.Le6 Pg4
29.Df5+ Ke3 30.Dxg4 Lc3 31.Dg5+ Kd3
32.Ld5 (19.558.510) 765
19/38 0:30 +6.72 20...h5 21.Dd4+ Kf5 22.Lc2+ Ke6
23.De4 e2 24.Dxe2 Lf6 25.Dxh5 Kd5
26.Lb3+ Ke4 27.Dh7+ Kf4 28.Le6 Pg4
29.Df5+ Ke3 30.Dxg4 Lc3 31.Lc4 Lb4
32.Le6 (23.266.906) 771
20/44 1:03 +6.97 20...h5 21.Dd4+ Kf5 22.Lc2+ Ke6
23.De4 Lh6 24.Dh7 Pf7 25.Lb3+ Ke5
26.Lxf7 Lg5 27.Lxh5 Kf4 28.Df7+ Ke5
29.Dg7+ Lf6 30.Dc7+ Kf5 31.Dc8+ Ke5
32.Le2 Lh4 33.Dc3+ Kf4 (51.748.792) 813
21/44 1:24 +10.42 20...h5 21.Dd4+ Kf5 22.Lc2+ Ke6
23.De4 e2 24.Dxe2 h4 25.Df2 Pd7
26.Df5+ Kd6 27.Dxg5 Pc5+ 28.Kc8 Kc6
29.Dxh4 Kd5 30.Dd8+ Ke5 31.Dc7+ Kd5
32.Lb3+ Kd4 33.Dd6+ Kc3 (70.199.797) 833
22/44 1:47 +12.03 20...h5 21.Dd4+ Kf5 22.Lc2+ Ke6
23.De4 e2 24.Dxe2 h4 25.Df2 Pd7
26.Df5+ Kd6 27.Dxg5 Pc5+ 28.Kc8 Kc6
29.Dxh4 Kd5 30.Dd8+ Ke5 31.Dc7+ Kd4
32.Dd6+ Kc4 33.Kc7 Kb5 (91.562.513) 853
23/46 2:11 +12.10 20...h5 21.Dd4+ Kf5 22.Lc2+ Ke6
23.De4 e2 24.Dxe2 h4 25.Df2 Pd7
26.Df5+ Kd6 27.Dxg5 Pc5+ 28.Kc8 h3
29.Dh6+ Ke5 30.De3+ Kd5 31.Dxh3 Ke5
32.De3+ Kd5 33.Df4 Kc6 (112.731.452) 857
24/46 2:36 +12.52 20...h5 21.Dd4+ Kf5 22.Lc2+ Ke6
23.De4 e2 24.Dxe2 h4 25.Df2 Pd7
26.Df5+ Kd6 27.Dxg5 Pc5+ 28.Kc8 h3
29.Df4+ Kd5 30.Lb3+ Pxb3 31.Df7+ Kc5
32.Dxb3 h2 33.Dc2+ Kb4 (130.010.193) 832
25/47 3:18 +12.93 20...h5 21.Dd4+ Kf5 22.Lc2+ Ke6
23.De4 e2 24.Dxe2 h4 25.Df2 Pd7
26.Df5+ Kd6 27.Dxg5 Pc5+ 28.Kc8 h3
29.Df4+ Kd5 30.Lb3+ Pxb3 31.Df7+ Kc5
32.Dxb3 h2 33.Dc2+ Kd4 (163.828.285) 826
26/50 4:31 +18.23 20...h5 21.Dd4+ Kf5 22.Lc2+ Ke6
23.De4 e2 24.Dxe2 h4 25.Df2 Pd7
26.Kc7 Pe5 27.Lb3+ Pc4 28.Dd4 Ld2
29.Lxc4+ Kf5 30.Dxd2 h3 31.Dd7+ Kg5
32.Dxh3 Kf4 33.Ld3 Ke5 (227.848.754) 838
27/50 7:27 +14.56 20...h5 21.Dd4+ Kf5 22.Lc2+ Ke6
23.De4 e2 24.Dxe2 h4 25.Df2 Kd5
26.Dg2+ Kc4 27.De4+ Kc3 28.Dxe5+ Kxc2
29.Dxg5 Kd3 30.Dxh4 Ke3 31.Dh3+ Kd2
32.Dh2+ Kc1 33.De2 Kb1 (412.553.634) 921
28/52 8:02 +15.15 20...h5 21.Dd4+ Kf5 22.Lc2+ Ke6
23.De4 e2 24.Dxe2 h4 25.Df2 Kd5
26.Dg2+ Kc4 27.De4+ Kc3 28.Dxe5+ Kxc2
29.Dxg5 Kd3 30.Dxh4 Ke3 31.De1+ Kf3
32.Kc6 Kg2 33.De2+ Kg3 (447.337.426) 927
29/54 10:54 +M32 20...h5 21.Dd4+ Kf5 22.Lc2+ Ke6
23.De4 e2 24.Dxe2 Lf6 25.De4 Kf7
26.Dh7+ Lg7 27.Df5+ Lf6 28.Dxh5+ Kf8
29.Dh6+ Ke7 30.Lb3 Pf7 31.Dh7 Kd6
32.Dxf7 Ke5 33.De6+ Kf4 (646.358.760) 987
30/54 13:04 +M28 20...h5 21.Dd4+ Kf5 22.Lc2+ Ke6
23.De4 e2 24.Dxe2 Lf6 25.De4 Kf7
26.Dh7+ Lg7 27.Df5+ Lf6 28.Dxh5+ Kf8
29.Dh6+ Ke7 30.Lb3 Pf7 31.Dh7 Kd6
32.Dxf7 Ke5 33.De6+ Kf4 (808.777.111) 1030
30/54 13:38 +M31 20...e2 (855.644.445) 1045
31/54 13:45 +M31 20...e2 (863.076.607) 1046
32/54 14:29 +M31 20...e2 (917.370.180) 1055
32/54 17:29 +M31 20...e2 (1.135.659.661) 1082
33/54 18:21 +M31 20...e2 (1.203.812.712) 1093
34/56 19:43 +M31 20...e2 (1.307.530.426) 1104
34/58 25:11 +M31 20...e2 (1.695.064.847) 1121
35/60 27:04 +M31 20...e2 (1.836.633.833) 1130
36/60 29:43 +M31 20...e2 (2.034.803.308) 1140
37/66 190:30 +M27 20...e2 21.Dd2+ Kg3 22.De1+ Kf4
23.Dxe2 Kf5 24.Lc2+ Ke6 25.Df2 Kd5
26.Db6 Lc1 27.Lh7 Lg5 28.Db3+ Kd4
29.Db4+ Pc4 30.Lg8 Ke3 31.Lxc4 Lf6
32.Db6+ Ld4 33.De6+ Kf4 (14.508.521.387) 1269
38/66 244:15 +M27 20...e2 21.Dd2+ Kg3 22.De1+ Kf4
23.Dxe2 Kf5 24.Lc2+ Ke6 25.Df2 Kd5
26.Db6 Lc1 27.Lh7 Lg5 28.Db3+ Kd4
29.Db4+ Pc4 30.Lg8 Ke3 31.Lxc4 Lf6
32.Db6+ Ld4 33.De6+ Kf4 (18.760.676.748) 1280
39/66 324:33 +M27 20...e2 21.Dd2+ Kg3 22.De1+ Kf4
23.Dxe2 Kf5 24.Lc2+ Ke6 25.Df2 Kd5
26.Db6 Lc1 27.Lh7 Lg5 28.Db3+ Kd4
29.Db4+ Pc4 30.Lg8 Ke3 31.Lxc4 Lf6
32.Db6+ Ld4 33.De6+ Kf4 (24.775.184.636) 1272
40/66 552:32 +M23 20...e2 21.Dd2+ Kg3 22.De1+ Kf3
23.Dxe2+ Kf4 24.Df2+ Ke4 25.Lc2+ Kd5
26.Db6 Lc1 27.Lh7 Lg5 28.Db3+ Kd4
29.Dd1+ Ke3 30.De1+ Kf4 31.De4+ Kg3
32.Dxe5+ Lf4 33.De4 h5 (43.061.794.854) 1298
41/66 847:40 +M23 20...e2 21.Dd2+ Kg3 22.De1+ Kf3
23.Dxe2+ Kf4 24.Df2+ Ke4 25.Lc2+ Kd5
26.Db6 Lc1 27.Lh7 Lg5 28.Db3+ Kd4
29.Dd1+ Ke3 30.De1+ Kf4 31.De4+ Kg3
32.Dxe5+ Lf4 33.De4 h5 (67.517.489.283) 1327I am curious if there is an engine that can find the Mate in 23 fast if it can't use its tablebases, especially with 6 men or more of course. Crafty was handicapped here, especially because the NNUE is not so fast of course but you could just count the number of nodes instead for better comparison with fast HCE (Crafty or otherwise). In time, it was just over 9 hours (552 minutes) But the handicaps were big:
1.) No tablebases, no Syzygy in this case, because it is Mark's UCI + NNUE version of Crafty.
2.) Crafty's search pretty much only extends checks, as far as I can see, I did not yet really investigate further if I missed some other extension. Singular extensions help here, in theory, if there are forcing (and singular) moves that are not checks. On the other hand I think Stockfish now really sucks on the Plaskett puzzle if, in my case, it can't use any EGTB's. Bob disliked the Rybka/stolen by Stockfish singular extensions, he wanted the real Deep Blue version, or nothing at all
. 3.) It (Crafty 25.6.1) had already seen, by itself completely, that 20...e2 led to a +M27 and I restarted the search so, being Black it started looking for a better alternative which otherwise would have ended up on the other side of the PV and thus much shorter (nullmoves etc.). Now all the PVs with 20...h5 take up seas of time and in the end Crafty sees it does not have better than 20...e2. By this time it had also lost the exact +M27 PV, as you can see in the output.
So 9 hours should be easy to beat even if you do not know it is a +M27, or shorter. Crafty knew too much, as someone once said, of Chess Tiger I think it was. Way in the past...
[pgn]
[Event "?"]
[Site "?"]
[Date "2026.10.21"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "8/3P3k/n2K3p/2p3n1/1b4N1/2p1p1P1/8/3B4 w - -"]
1. Nf6+ {+7.03/34 50:34m} (1. Nf6+ {+6.67/57 5:01m} Kg7
2. Nh5+ Kg6 3. Bc2+ Kxh5 4. d8=Q Kg4 5. Bd1+ Kxg3 6. Qe8
c4+ 7. Kc6 Bc5 8. Qe5+ Kg2 9. Qd5+ Kg3 10. Qxc4 Nf3
(10... c2 {+14.77/37 5:44m} 11. Bxc2 Nf3 12. Kb7 Nb8
13. Kxb8 Bd6+ 14. Kb7 Kf2 (14... Bf4 {+14.34/39 725:02m}
15. Qf1 Nd2 16. Qg1+ Kf3 17. Kc6 Bg3 18. Bd1+ e2 19. Bxe2+
Kxe2 20. Qxg3 Nf3 21. Qg4 Ke3 22. Kd5 Ng5 23. Qg3+ Nf3
24. Qg7 Kf4 25. Qxh6+ Ng5 26. Qg6 Nf3 27. Qe4+ Kg3)
(14... Be7 {+6.75/34 183:36m} 15. Bd1 Bg5 16. Qf1 Ne5
17. Qe2 Kf4 18. Qc2 Nf3 19. Qc7+ Ne5 20. Qd6 {(Diagram)
first search here: 20...e2 21.Qd2+ is +M27 says Crafty NNUE
now.} e2 {21.Qd2+ is +M30 says Crafty} 21. Qd2+ Kf5
22. Qxe2 Bf4 23. Qg2) 15. Bd1 Ng1 16. Qf7+ Ke1 17. Qg6 Bh2
18. Bh5 {18...Kf1 is +M24 volgens Crafty} Kf2 19. Qf6+ Kg2
20. Qb2+ e2 21. Bxe2 Bf4 22. Bh5+ Kg3 23. Qc3+ Kh2) 11. Kb7
Nd4 12. Qxc3 Kf2 13. Kxa6 Ba7 14. Qc7) 1... Kg7 2. Nh5+ Kg6
3. Bc2+ Kxh5 4. d8=Q Kg4 5. Bd1+ (5. Qf6 {+7.05/34 101:07m}
Kxg3 6. Qf1 c4+ 7. Kd5 Nc7+ 8. Kxc4 Nf3 9. Kxb4 Nd5+
10. Kc5 Nf6 11. Qe2 Kf4 12. Bd1 Ne5 13. Qf1+ Kg5 14. Qg2+
Kf5 15. Kd4 Nfd7 16. Qh3+ Kg6 17. Qxe3 h5 18. Ba4) 5... e2
6. Bxe2+ Kh3 7. Qc8+ Kg2 8. Bd1 (8. Qxa6 {+8.41/25 10:52m}
Ne4+ 9. Ke5 Nd2 10. Bd1 Kg1 11. Kd5 (11. Qe2 {+M14/24
5:38m} c4 12. Bc2 Bc5 13. Be4 Bf2 14. Qd1+ Nf1 15. Qf3
Bxg3+ 16. Kd5 Ne3+ 17. Qxe3+ Bf2 18. Qe2 c2 19. Qxc2 Kf1
20. Kxc4 Bg3 21. Qg2+ Ke1 22. Kd3 Bf2 23. Qh1+ Bg1
24. Qxg1+) 11... Nf1 (11... Nf1 {+M16/44 15:34m} 12. Qe2
Ba3 13. Qe1 Kg2 14. Qxc3 Bb4 15. Qf3+ Kg1 16. Bc2 Bd2
17. Be4 Ne3+ 18. Kxc5 Bc1 19. Qh1+ Kf2 20. Qxc1 Nf1
21. Qf4+ Ke2 22. Qf3+ Kd2 23. Qxf1 h5 24. Qf2+ Kd1) 12. Qe2
Ba3 13. Qe1 h5 14. Bc2 Bb2 15. Bd3 Kg2 16. Be4+ Kh3
17. Qxf1+ Kxg3 18. Qf3+ Kh4 19. Qf4+ Kh3) 8... Ne4+ 9. Kd5
Nf2 10. Bc2 Kxg3 11. Qxa6 h5 12. Qe2 Ng4 13. Ke4 Ba5
14. Qe1+ *
[/pgn]