Hello Jon:
JVMerlino wrote: ↑Mon Feb 15, 2021 6:50 pm
So I was enjoying one of agadmator's excellent chess videos - Rodzynski v Alekhine, 1913.
https://www.youtube.com/watch?v=zJU1whqM8yM
Here's the game:
[pgn]1. e4 e5 2. Nf3 d6 3. Bc4 Nc6 4. c3 Bg4 5. Qb3 Qd7 6. Ng5 Nh6 7. Bxf7 Nxf7 8. Nxf7 Qxf7 9. Qxb7 Kd7 10. Qxa8 Qc4 11. f3 Bxf3 12. gxf3 Nd4 13. d3 Qxd3 14. cxd4 Be7 15. Qxh8 Bh4#[/pgn]
I was playing around with some possible escapes for White's King (using Chessmater 9000 as I always like to feel the nostalgia) and came up with this position if White played 15.Kf2:
[d]Q6r/p1pkb1pp/3p4/4p3/3PP3/3q1P2/PP3K1P/RNB4R b - - 0 15
And The King announced Mate in 15 in less than one second:
Code: Select all
Time Depth Score Positions Moves
0:00 1/3 -2.65 920 15...Qxd4+ 16.Kg2 Rxa8 17.Nc3 Rf8
0:00 1/4 -2.47 3161 15...Qxd4+ 16.Kg2 Rxa8 17.Nc3 c6
18.Ne2
0:00 1/4 -2.76 6357 15...Rxa8 16.Nd2 exd4 17.Rg1 Qe3+
18.Kf1
0:00 1/5 -2.90 16626 15...Rxa8 16.Nd2 Qxd4+ 17.Kg2 Rf8
18.Rd1 Bg5
0:00 1/6 -3.02 66527 15...Rxa8 16.Rf1 Rf8 17.Kg2 exd4
18.Nd2 Qe2+ 19.Kg1
0:00 1/7 -3.09 113078 15...Rxa8 16.Rf1 Rf8 17.Kg2 exd4
18.Nd2 Qe2+ 19.Rf2
0:00 1/8 -3.04 278996 15...Rxa8 16.Rf1 Bh4+ 17.Kg1 Qxd4+
18.Kh1 Qd3 19.Nd2 Bg5 20.Rf2 Rf8
0:00 1/8 -5.23 618023 15...Bh4+ 16.Kg2 Qe2+ 17.Kh3 Qxf3+
18.Kxh4 Qf2+ 19.Kg5 Rxa8 20.dxe5
Qg2+ 21.Kh5 Qg6+ 22.Kh4 Qxe4+ 23.Kg3
Qxh1 24.Bf4
0:00 1/9 -Mate15 1651820 15...Bh4+ 16.Kg2 Qe2+ 17.Kh3 Qxf3+
18.Kxh4 Qf2+ 19.Kg5 Qg2+ 20.Kh5
Qh3+ 21.Kg5 h6+ 22.Kg6 Qg4+ 23.Kf7
Qe6+ 24.Kxg7 Rxa8 25.Rg1 Rg8+ 26.Kh7
Qf7+ 27.Kxh6 Rh8+ 28.Kg5 Qg7+ 29.Kf5
Rf8#
0:01 1/10 -Mate15 2796402 15...Bh4+ 16.Kg2 Qe2+ 17.Kh3 Qxf3+
18.Kxh4 Qf2+ 19.Kg5 Qg2+ 20.Kh5
Qh3+ 21.Kg5 h6+ 22.Kg6 Qg4+ 23.Kf7
Qe6+ 24.Kxg7 Rxa8 25.Rg1 Rg8+ 26.Kh7
Qf7+ 27.Kxh6 Rh8+ 28.Kg5 Qg7+ 29.Kf5
Rf8#
So I tried it on SF 12 (only one core, to be fair), just to make sure that it wasn't something that any engine could find, although The King was always a terrific matefinder in its day:
info depth 26 seldepth 42 multipv 1 score mate 15 nodes 8316501 nps 2464148 hashfull 1000 tbhits 0 time 3375 pv e7h4 f2g2 d3e2 g2h3 e2f3 h3h4 f3f2 h4g5 h8a8 a2a4 f2g2 g5h5 g2f3 h5g5 h7h6 g5g6 f3e4 g6g7 e4g2 g7h7 g2g8 h7h6 g8h8 h6g6 a8g8 g6f5 h8h7 f5f6 h7g6
More than 3x longer to find it. Made me happy, anyway....
jm
I tried SF 12 with NNUE disabled and is fast reporting mating evals. However, it reports a checkmate in 13 instead of a checkmate in 15:
Code: Select all
FEN: Q6r/p1pkb1pp/3p4/4p3/3PP3/3q1P2/PP3K1P/RNB4R b - - 0 15
Stockfish_20090216_x64_modern:
Found 145 tablebases
classical evaluation enabled
1/1 00:00 232 10.545 +6,86 Rh8xa8
[...]
10/17 00:00 33.659 909.702 +5,79 Rh8xa8 Nb1d2 Be7g5 Rh1f1 Bg5e3+ Kf2e1 e5xd4 Nd2b3 Ra8f8 Bc1xe3 Qd3xe3+ Ke1d1
11/18 00:00 57.071 1.214.276 +6,21 Rh8xa8 Nb1d2 Be7g5 Rh1f1 Ra8f8 Kf2g1 Bg5e3+ Kg1h1 Qd3e2
[...]
29/36+ 00:04 13.202.071 3.292.287 +67,50 Be7h4+
29/36+ 00:04 13.255.395 3.292.447 +M38 Be7h4+
29/36- 00:04 13.256.861 3.292.811 +66,12 Be7h4+ Kf2g2
29/40+ 00:04 13.286.430 3.290.349 +110,55 Be7h4+
29/40+ 00:04 13.590.472 3.266.155 +148,62 Be7h4+
29/40 00:04 13.803.157 3.259.305 +M26 Be7h4+ Kf2g2 Qd3e2+ Kg2h3 Qe2xf3+ Kh3xh4 Rh8xa8 Rh1g1 Qf3f2+ Rg1g3 Qf2xh2+ Rg3h3 Qh2f2+ Kh4g4 h7h5+ Rh3xh5 Qf2g2+ Kg4h4 Qg2xe4+ Kh4g5 Qe4g2+ Kg5h4 Ra8f8 Rh5h6 Qg2h2+ Kh4g4 g7xh6 Bc1e3 h6h5+ Kg4g5 Qh2g2+ Kg5h4 Rf8f4+ Kh4xh5 Qg2h3+ Kh5g6
30/49 00:04 15.075.714 3.257.500 +M18 Be7h4+ Kf2g2 Qd3e2+ Kg2h3 Qe2xf3+ Kh3xh4 Rh8xa8 Rh1g1 Qf3f2+ Rg1g3 Qf2xh2+ Rg3h3 Qh2f2+ Kh4h5 Qf2e2+ Kh5h4 Qe2xe4+ Kh4h5 Ra8f8 Rh3g3 Rf8f5+ Rg3g5 Qe4e2+ Kh5h4 Qe2h2+ Kh4g4 h7h5+ Rg5xh5 Qh2xh5+ Kg4g3 Rf5f3+ Kg3g2 Qh5h3+ Kg2g1 Rf3f1+
31/34 00:05 15.520.572 3.246.302 +M17 Be7h4+ Kf2g2 Qd3e2+ Kg2h3 Qe2xf3+ Kh3xh4 Rh8xa8 Rh1g1 Qf3f2+ Rg1g3 Qf2xh2+ Rg3h3 Qh2f2+ Kh4h5 Qf2e2+ Kh5h4 Qe2xe4+ Kh4h5 Ra8f8 Rh3g3 Qe4h1+ Kh5g4 Qh1h2 Bc1h6 g7xh6 d4xe5 h6h5+ Kg4g5 Qh2xg3+ Kg5xh5 Qg3h3+ Kh5g5 Rf8f5+
32/34 00:05 16.082.880 3.228.197 +M17 Be7h4+ Kf2g2 Qd3e2+ Kg2h3 Qe2xf3+ Kh3xh4 Rh8xa8 Rh1g1 Qf3f2+ Rg1g3 Qf2xh2+ Rg3h3 Qh2f2+ Kh4h5 Qf2e2+ Kh5h4 Qe2xe4+ Kh4h5 Ra8f8 Rh3g3 Qe4h1+ Kh5g4 Qh1h2 Bc1h6 g7xh6 d4xe5 h6h5+ Kg4g5 Qh2xg3+ Kg5xh5 Qg3h3+ Kh5g5 Rf8f5+
33/34 00:05 17.943.722 3.225.547 +M17 Be7h4+ Kf2g2 Qd3e2+ Kg2h3 Qe2xf3+ Kh3xh4 Rh8xa8 Rh1g1 Qf3f2+ Rg1g3 Qf2xh2+ Rg3h3 Qh2f2+ Rh3g3 Ra8f8 Kh4h3 Qf2f1+ Kh3g4 h7h5+ Kg4h4 Qf1h1+ Kh4g5 Qh1xc1+ Nb1d2 Qc1xd2+ Kg5h4 Qd2h2+ Rg3h3 Rf8f4+ Kh4g5 Rf4g4+ Kg5xh5 Qh2xh3+
34/34 00:06 18.824.594 3.221.183 +M17 Be7h4+ Kf2g2 Qd3e2+ Kg2h3 Qe2xf3+ Kh3xh4 Rh8xa8 Rh1g1 Qf3f2+ Rg1g3 Qf2xh2+ Rg3h3 Qh2f2+ Rh3g3 Ra8f8 Kh4h3 Qf2f1+ Kh3g4 h7h5+ Kg4h4 Qf1h1+ Kh4g5 Qh1xc1+ Nb1d2 Qc1xd2+ Kg5h4 Qd2h2+ Rg3h3 Rf8f4+ Kh4g5 Rf4g4+ Kg5xh5 Qh2xh3+
35/34 00:06 19.614.242 3.215.976 +M17 Be7h4+ Kf2g2 Qd3e2+ Kg2h3 Qe2xf3+ Kh3xh4 Rh8xa8 Rh1g1 Qf3f2+ Rg1g3 Qf2xh2+ Rg3h3 Qh2f2+ Rh3g3 Ra8f8 Kh4h3 Qf2f1+ Kh3g4 h7h5+ Kg4h4 Qf1h1+ Kh4g5 Qh1xc1+ Nb1d2 Qc1xd2+ Kg5h4 Qd2h2+ Rg3h3 Rf8f4+ Kh4g5 Rf4g4+ Kg5xh5 Qh2xh3+
36/34 00:06 20.689.326 3.208.642 +M17 Be7h4+ Kf2g2 Qd3e2+ Kg2h3 Qe2xf3+ Kh3xh4 Rh8xa8 Rh1g1 Qf3f2+ Rg1g3 Qf2xh2+ Rg3h3 Qh2f2+ Rh3g3 Ra8f8 Kh4h3 Qf2f1+ Kh3g4 h7h5+ Kg4h4 Qf1h1+ Kh4g5 Qh1xc1+ Nb1d2 Qc1xd2+ Kg5h4 Qd2h2+ Rg3h3 Rf8f4+ Kh4g5 Rf4g4+ Kg5xh5 Qh2xh3+
37/34 00:07 22.529.588 3.200.225 +M16 Be7h4+ Kf2g2 Qd3e2+ Kg2h3 Qe2xf3+ Kh3xh4 Rh8xa8 Rh1g1 Qf3f2+ Rg1g3 Qf2xh2+ Rg3h3 Qh2f2+ Rh3g3 Ra8f8 Kh4h3 Qf2f1+ Kh3g4 Qf1d1+ Kg4g5 Qd1h1 Kg5g4 Rf8f1 Nb1c3 g7g6 Rg3h3 Rf1g1+ Kg4h4 Qh1g2 Bc1g5 Qg2xg5+
38/32 00:07 23.407.176 3.197.701 +M16 Be7h4+ Kf2g2 Qd3e2+ Kg2h3 Qe2xf3+ Kh3xh4 Rh8xa8 Rh1g1 Qf3f2+ Rg1g3 Qf2xh2+ Rg3h3 Qh2f2+ Rh3g3 Ra8f8 Kh4h3 Qf2f1+ Kh3g4 Qf1d1+ Kg4g5 Qd1h1 Kg5g4 Rf8f1 Nb1c3 g7g6 Rg3h3 Rf1g1+ Kg4h4 Qh1g2 Bc1g5 Qg2xg5+
39/32 00:07 24.541.799 3.187.246 +M16 Be7h4+ Kf2g2 Qd3e2+ Kg2h3 Qe2xf3+ Kh3xh4 Rh8xa8 Rh1g1 Qf3f2+ Rg1g3 Qf2xh2+ Rg3h3 Qh2f2+ Rh3g3 Ra8f8 Kh4h3 Qf2f1+ Kh3g4 Qf1d1+ Kg4g5 Qd1h1 Kg5g4 Rf8f1 Nb1c3 g7g6 Rg3h3 Rf1g1+ Kg4h4 Qh1g2 Bc1g5 Qg2xg5+
40/32 00:08 25.521.609 3.180.262 +M16 Be7h4+ Kf2g2 Qd3e2+ Kg2h3 Qe2xf3+ Kh3xh4 Rh8xa8 Rh1g1 Qf3f2+ Rg1g3 Qf2xh2+ Rg3h3 Qh2f2+ Rh3g3 Ra8f8 Kh4h3 Qf2f1+ Kh3g4 Qf1d1+ Kg4g5 Qd1h1 Kg5g4 Rf8f1 Nb1c3 g7g6 Rg3h3 Rf1g1+ Kg4h4 Qh1g2 Bc1g5 Qg2xg5+
41/32 00:08 27.552.729 3.184.182 +M16 Be7h4+ Kf2g2 Qd3e2+ Kg2h3 Qe2xf3+ Kh3xh4 Rh8xa8 Rh1g1 Qf3f2+ Rg1g3 Qf2xh2+ Rg3h3 Qh2f2+ Rh3g3 Ra8f8 Kh4h3 Qf2f1+ Kh3g4 Qf1d1+ Kg4g5 Qd1h1 Kg5g4 Rf8f1 Nb1c3 g7g6 Rg3h3 Rf1g1+ Kg4h4 Qh1g2 Bc1g5 Qg2xg5+
42/32 00:09 29.902.538 3.178.753 +M16 Be7h4+ Kf2g2 Qd3e2+ Kg2h3 Qe2xf3+ Kh3xh4 Rh8xa8 Rh1g1 Qf3f2+ Rg1g3 Qf2xh2+ Rg3h3 Qh2f2+ Rh3g3 Ra8f8 Kh4h3 Qf2f1+ Kh3g4 Qf1d1+ Kg4g5 Qd1h1 Kg5g4 Rf8f1 Nb1c3 g7g6 Rg3h3 Rf1g1+ Kg4h4 Qh1g2 Bc1g5 Qg2xg5+
43/32 00:14 47.115.238 3.235.047 +M13 Be7h4+ Kf2g2 Qd3e2+ Kg2h3 Qe2xf3+ Kh3xh4 Qf3f2+ Kh4h5 Rh8xa8 Rh1g1 Qf2xg1 Nb1c3 Qg1xh2+ Kh5g4 Ra8f8 Nc3e2 h7h5+ Kg4g5 Qh2g2+ Ne2g3 Qg2xg3+ Kg5xh5 Rf8h8+ Bc1h6 Rh8xh6+
[...]
73/26 02:19 448.957.950 3.234.357 +M13 Be7h4+ Kf2g2 Qd3e2+ Kg2h3 Qe2xf3+ Kh3xh4 Qf3f2+ Kh4h5 Rh8xa8 Rh1g1 Qf2xg1 Nb1c3 Qg1xh2+ Kh5g4 Ra8f8 Nc3e2 h7h5+ Kg4g5 Qh2g2+ Ne2g3 Qg2xg3+ Kg5xh5 Rf8h8+ Bc1h6 Rh8xh6+
I stopped the search at depth 73 with 228 TB hits on the full set of 3, 4 and 5-man Syzygy EGTB.
My run deviates with 19.- Kh5 instead of 19.- Kg5 given by both The King and your SF run. I cleared hash and start a new analysis with this position:
[d]Q6r/p1pk2pp/3p4/4p3/3PP2K/8/PP3q1P/RNB4R w - - 1 19
SF 12 without NNUE insists on the same mainline of the checkmate in 13 (now a checkmate in 9 after the first moves are played). Then the question is: what is better, 19.- Kh5 or 19.- Kg5? Well, I let Chest 5.2 in normal mode to do the work after white plays each of the four legal moves: Kg4, Kg5, Kh3 and Kh5:
Code: Select all
19.- Kg4 ==> #3 (#7 in the original position).
19.- Kg5 ==> #9 (#13 in the original position).
19.- Kh3 ==> #8 (#12 in the original position).
19.- Kh5 ==> #9 (#13 in the original position).
Code: Select all
FEN: Q6r/p1pk2pp/3p4/4p3/3PP1K1/8/PP3q1P/RNB4R b - - 1 19
ChestUCI:
FEN: Q6r/p1pk2pp/3p4/4p3/3PP1K1/8/PP3q1P/RNB4R b - - (11+9)
Stellungs-Analyse: C0/R0/K4/P9/X34 S:9/38
Problem im Clipboard gefunden: #3; 00:00;
Suche nach Matt in 11 ... (Hash=512MB)
3 00:00 0 0 +M3 h7h5+
Suche abgeschlossen ... (Zeit=0.00s)
Matt in 3 gefunden ! (1 Lösung in 00:00)
3/3 00:00 359 179.500 +M3 h7h5+ Kg4h3 Qf2f3+ Kh3h4 Qf3g4+
Code: Select all
FEN: Q6r/p1pk2pp/3p4/4p1K1/3PP3/8/PP3q1P/RNB4R b - - 1 19
ChestUCI:
FEN: Q6r/p1pk2pp/3p4/4p1K1/3PP3/8/PP3q1P/RNB4R b - - (11+9)
Stellungs-Analyse: C0/R0/K3/P9/X31 S:9/37
Suche nach Matt in 11 ... (Hash=512MB)
9 04:27 164.886.710 719.341 +M9 Qf2g2+
9 10:25 407.913.558 670.650 +M9 Rh8xa8
Suche abgeschlossen ... (Zeit=864.78s)
Matt in 9 gefunden ! (2 Lösungen in 14:24)
9/9 14:26 562.526.809 650.483 +M9 Rh8xa8 Nb1c3 Qf2g2+ Kg5h5 Qg2h3+ Kh5g5 g7g6 Nc3d5 Qh3h5+ Kg5f6 g6g5 Nd5e7 Qh5h6+ Kf6f5 Ra8f8+ Kf5g4 Qh6h4+
9/9 14:26 562.526.809 650.483 +M9 Qf2g2+ Kg5h5 Rh8xa8 d4xe5 Qg2h3+ Kh5g5 Ra8f8 Rh1f1 Rf8xf1 Bc1e3 Qh3xe3+ Kg5h5 Qe3h3+ Kh5g5 Rf1g1+ Kg5f4 g7g5+
Code: Select all
FEN: Q6r/p1pk2pp/3p4/4p3/3PP3/7K/PP3q1P/RNB4R b - - 1 19
ChestUCI:
FEN: Q6r/p1pk2pp/3p4/4p3/3PP3/7K/PP3q1P/RNB4R b - - (11+9)
Stellungs-Analyse: C0/R0/K2/P8/X30 S:9/38
Suche nach Matt in 11 ... (Hash=512MB)
8 00:13 8.900.406 789.813 +M8 h7h5
Suche abgeschlossen ... (Zeit=40.10s)
Matt in 8 gefunden ! (1 Lösung in 00:40)
8/8 00:40 32.318.056 805.996 +M8 h7h5 Qa8d8+ Rh8xd8 Bc1f4 g7g5 Bf4g3 g5g4+ Kh3h4 Qf2f6+ Kh4xh5 Rd8g8 Bg3f4 e5xf4 h2h3 Qf6g5+
Code: Select all
FEN: Q6r/p1pk2pp/3p4/4p2K/3PP3/8/PP3q1P/RNB4R b - - 1 19
ChestUCI:
FEN: Q6r/p1pk2pp/3p4/4p2K/3PP3/8/PP3q1P/RNB4R b - - (11+9)
Stellungs-Analyse: C0/R0/K3/P9/X33 S:9/37
Suche nach Matt in 11 ... (Hash=512MB)
9 01:26 44.696.527 789.775 +M9 g7g6+
9 09:29 354.978.277 719.720 +M9 Rh8xa8
Suche abgeschlossen ... (Zeit=735.87s)
Matt in 9 gefunden ! (2 Lösungen in 12:15)
9/9 12:17 519.688.521 706.228 +M9 Rh8xa8 a2a4 g7g6+ Kh5g5 h7h6+ Kg5g4 Qf2g2+ Kg4h4 g6g5+ Kh4h5 Qg2h3+ Kh5g6 Ra8g8+ Kg6h7 Qh3e6 h2h3 Qe6g6+
9/9 12:17 519.688.521 706.228 +M9 g7g6+ Kh5g5 h7h6+ Kg5g4 Qf2g2+ Kg4h4 h6h5 Qa8d8+ Kd7xd8 h2h3 Qg2f2+ Kh4g5 Kd8e7 Bc1f4 Qf2xf4+ Kg5xg6 Qf4f6+
Chest found some checkmates in 9 from the point that my SF run deviated from your original post. I would say that the position from your post is likely a checkmate in 13.
------------
Other than that, it is always a pleasure to see the old rockers shining from time to time. I had Chessmaster 9000 and enjoyed it a lot!
Regards from Spain.
Ajedrecista.