Hello Bernhard:
BBauer wrote:This one may take some time for some engines.
Kind regards
[D]8/8/p7/p7/b3Q3/K7/p1r5/rk6 w - -
Chest also solves this position, in even less time than the other! Around 343 ms were enough:
Code: Select all
FEN: 8/8/p7/p7/b3Q3/K7/p1r5/rk6 w - - 0 1
ChestUCI_52:
FEN: 8/8/p7/p7/b3Q3/K7/p1r5/rk6 w - - (2+7)
Stellungs-Analyse: C0/R0/K2/P2/X6 W:2/27
Suche nach Matt in 10 ... (Hash=64MB)
7 00:00 0 0 +M7 Qe4h1+
Suche abgeschlossen ... (Zeit=0.34s)
Matt in 7 gefunden ! (1 Lösung in 00:00)
7/7 00:00 80.563 234.877 +M7 Qe4h1+ Rc2c1 Qh1h7+ Rc1c2 Qh7e4 Ba4b5 Qe4e1+ Rc2c1 Qe1d2 Rc1c3+ Qd2xc3 a5a4 Qc3b2+
JetChess is a perft counter that also solves short checkmates. Analysis by JetChess 1.0.0.0 with 64 MB of hash:
Code: Select all
1 Qe4-d5 0
2 Qe4-c6 0
3 Qe4-b7 0
4 Qe4-a8 0
5 Qe4-f5 0
6 Qe4-g6 0
7 Qe4-h7 0
8 Qe4-f3 0
9 Qe4-g2 0
10 Qe4-h1 Mate
11 Qe4-d3 0
12 Qe4*c2 0
13 Qe4-e5 0
14 Qe4-e6 0
15 Qe4-e7 0
16 Qe4-e8 0
17 Qe4-f4 0
18 Qe4-g4 0
19 Qe4-h4 0
20 Qe4-d4 0
21 Qe4-c4 0
22 Qe4-b4 0
23 Qe4*a4 0
24 Qe4-e3 0
25 Qe4-e2 0
26 Qe4-e1 0
27 Ka3*a4 0
Solution: Qe4-h1 (mate in 7)
Time: 363 ms
Solving time of JetChess was similar to the spent time by Chest.
Cyclone is very good solving checkmates. Analysis by Cyclone xTreme II w32 (using two cores) in an Intel Pentium D930 (3 GHz), with 128 MB of hash, running under Arena 2.0.1 GUI:
FEN: 8/8/p7/p7/b3Q3/K7/p1r5/rk6 w - - 0 1
Cyclone xTreme II:
1/8 00:00 88 0 -12,24 Qe4xa4 Rc2c3+ Qa4b3+ Rc3xb3+ Ka3xb3 a5a4+ Kb3c3
1/8 00:00 200 0 -2,45 Ka3xa4 Kb1b2 Qe4b7+ Kb2c1 Qb7xa6
1/8 00:00 227 0 0,00 Qe4e1+ Rc2c1 Qe1e4+ Rc1c2
2/8 00:00 555 0 0,00 Qe4e1+ Rc2c1 Qe1e4+ Rc1c2
3/8 00:00 762 0 0,00 Qe4e1+ Rc2c1 Qe1e4+ Rc1c2
4/10 00:00 1.081 0 0,00 Qe4e1+ Rc2c1 Qe1e4+ Rc1c2
5/12 00:00 1.273 0 0,00 Qe4e1+ Rc2c1 Qe1e4+ Rc1c2
6/16 00:00 1.758 0 0,00 Qe4e1+ Rc2c1 Qe1e4+ Rc1c2
7/21 00:00 3.761 0 0,00 Qe4e1+ Rc2c1 Qe1e4+ Rc1c2
8/30 00:00 22.898 0 0,00 Qe4e1+ Rc2c1 Qe1e4+ Rc1c2
9/30 00:00 45.048 0 0,00 Qe4e1+ Rc2c1 Qe1e4+ Rc1c2
10/30 00:00 131.666 0 0,00 Qe4e1+ Rc2c1 Qe1e4+ Rc1c2
11/30 00:00 217.274 0 0,00 Qe4e1+ Rc2c1 Qe1e4+ Rc1c2
12/30 00:00 340.273 0 0,00 Qe4e1+ Rc2c1 Qe1e4+ Rc1c2
13/32 00:00 574.956 0 0,00 Qe4e1+ Rc2c1 Qe1e4+ Rc1c2
13/40 00:01 720.263 1.240.000 +M7 Qe4h1+ Rc2c1 Qh1h7+ Rc1c2 Qh7e4 Ba4b3 Qe4e1+ Rc2c1 Qe1d2 Bb3c2 Qd2c3 a5a4 Qc3b2+
14/40 00:01 900.170 1.316.904 +M7 Qe4h1+ Rc2c1 Qh1h7+ Rc1c2 Qh7e4 Ba4b3 Qe4e1+ Rc2c1 Qe1d2 Bb3c2 Qd2c3 a5a4 Qc3b2+
15/40 00:01 1.122.525 1.443.069 +M7 Qe4h1+ Rc2c1 Qh1h7+ Rc1c2 Qh7e4 Ba4b3 Qe4e1+ Rc2c1 Qe1d2 Bb3c2 Qd2c3 a5a4 Qc3b2+
16/40 00:01 1.397.646 1.579.120 +M7 Qe4h1+ Rc2c1 Qh1h7+ Rc1c2 Qh7e4 Ba4b3 Qe4e1+ Rc2c1 Qe1d2 Bb3c2 Qd2c3 a5a4 Qc3b2+
17/40 00:02 1.696.219 1.692.966 +M7 Qe4h1+ Rc2c1 Qh1h7+ Rc1c2 Qh7e4 Ba4b3 Qe4e1+ Rc2c1 Qe1d2 Bb3c2 Qd2c3 a5a4 Qc3b2+
18/40 00:02 1.999.049 1.801.253 +M7 Qe4h1+ Rc2c1 Qh1h7+ Rc1c2 Qh7e4 Ba4b3 Qe4e1+ Rc2c1 Qe1d2 Bb3c2 Qd2c3 a5a4 Qc3b2+
19/40 00:02 2.307.580 1.893.865 +M7 Qe4h1+ Rc2c1 Qh1h7+ Rc1c2 Qh7e4 Ba4b3 Qe4e1+ Rc2c1 Qe1d2 Bb3c2 Qd2c3 a5a4 Qc3b2+
20/40 00:02 2.621.366 1.974.608 +M7 Qe4h1+ Rc2c1 Qh1h7+ Rc1c2 Qh7e4 Ba4b3 Qe4e1+ Rc2c1 Qe1d2 Bb3c2 Qd2c3 a5a4 Qc3b2+
21/40 00:02 2.926.035 2.037.314 +M7 Qe4h1+ Rc2c1 Qh1h7+ Rc1c2 Qh7e4 Ba4b3 Qe4e1+ Rc2c1 Qe1d2 Bb3c2 Qd2c3 a5a4 Qc3b2+
22/40 00:03 3.239.293 2.085.765 +M7 Qe4h1+ Rc2c1 Qh1h7+ Rc1c2 Qh7e4 Ba4b3 Qe4e1+ Rc2c1 Qe1d2 Bb3c2 Qd2c3 a5a4 Qc3b2+
23/40 00:03 3.547.473 2.134.166 +M7 Qe4h1+ Rc2c1 Qh1h7+ Rc1c2 Qh7e4 Ba4b3 Qe4e1+ Rc2c1 Qe1d2 Bb3c2 Qd2c3 a5a4 Qc3b2+
24/40 00:03 3.864.393 2.171.779 +M7 Qe4h1+ Rc2c1 Qh1h7+ Rc1c2 Qh7e4 Ba4b3 Qe4e1+ Rc2c1 Qe1d2 Bb3c2 Qd2c3 a5a4 Qc3b2+
25/40 00:03 4.176.953 2.211.759 +M7 Qe4h1+ Rc2c1 Qh1h7+ Rc1c2 Qh7e4 Ba4b3 Qe4e1+ Rc2c1 Qe1d2 Bb3c2 Qd2c3 a5a4 Qc3b2+
26/40 00:04 4.485.085 2.244.897 +M7 Qe4h1+ Rc2c1 Qh1h7+ Rc1c2 Qh7e4 Ba4b3 Qe4e1+ Rc2c1 Qe1d2 Bb3c2 Qd2c3 a5a4 Qc3b2+
I stopped the analysis because it becomes evident that Cyclone succeed in this position.
Komodo 3 w32 (single core) surprised me!
FEN: 8/8/p7/p7/b3Q3/K7/p1r5/rk6 w - - 0 1
Komodo3-32:
1 00:00 120 7.680 -1,84 Ka3xa4 Kb1b2 Qe4b7+
2 00:00 399 25.536 -1,53 Ka3xa4 Kb1b2 Qe4d3
3 00:00 1.526 97.664 -1,69 Ka3xa4 Kb1c1 Qe4e3+ Kc1b1 Ka4xa5
4 00:00 1.834 117.376 -0,05 Ka3xa4 Kb1c1 Qe4e3+ Kc1b1 Qe3d3
5 00:00 2.051 131.264 -0,05 Ka3xa4 Kb1c1 Qe4e3+ Kc1b1 Qe3d3 Kb1c1 Qd3e3+
5 00:00 2.223 142.272 -0,05 Ka3xa4 Kb1c1 Qe4e3+ Kc1b1 Qe3d3 Kb1c1 Qd3e3+
6 00:00 2.906 185.984 -0,05 Ka3xa4 Kb1c1 Qe4e3+ Kc1b1 Qe3d3 Kb1c1 Qd3e3+
6 00:00 4.056 129.792 -0,05 Ka3xa4 Kb1c1 Qe4e3+ Kc1b1 Qe3d3 Kb1c1 Qd3e3+
7 00:00 5.645 180.640 -0,05 Ka3xa4 Kb1c1 Qe4e3+ Kc1b1 Qe3d3 Kb1c1 Qd3e3+
7 00:00 9.136 292.352 -0,05 Ka3xa4 Kb1c1 Qe4e3+ Kc1b1 Qe3d3 Kb1c1 Qd3e3+
8 00:00 13.609 290.325 0,00 Ka3xa4 Kb1c1 Qe4f4+ Kc1b1 Qf4f1+ Kb1b2 Qf1f6+ Rc2c3 Qf6f2+ Kb2c1 Qf2e1+ Kc1b2 Qe1d2+ Rc3c2 Qd2d4+
8 00:00 20.275 259.520 0,00 Ka3xa4 Kb1c1 Qe4f4+ Kc1b1 Qf4f1+ Kb1b2 Qf1f6+ Rc2c3 Qf6f2+ Kb2c1 Qf2e1+ Kc1b2 Qe1d2+ Rc3c2 Qd2d4+
9 00:00 27.830 296.853 -0,05 Ka3xa4 Kb1c1 Qe4f4+ Kc1b1 Qf4f1+ Kb1b2 Qf1f6+ Rc2c3 Qf6f2+ Kb2c1 Qf2e1+ Kc1b2 Qe1d2+ Rc3c2 Qd2d4+ Rc2c3 Qd4d2+
9 00:00 52.994 339.161 0,00 Qe4h1+ Rc2c1 Qh1h7+ Rc1c2 Qh7e4 Ba4c6 Qe4xc2+ Kb1xc2
9 00:00 56.332 327.749 0,00 Qe4h1+ Rc2c1 Qh1h7+ Rc1c2 Qh7e4 Ba4c6 Qe4xc2+ Kb1xc2
10 00:00 59.390 316.746 +0,16 Qe4h1+
10 00:00 60.793 324.229 +0,63 Qe4h1+
10 00:00 65.751 323.697 +M9 Qe4h1+
10 00:00 74.548 340.790 +M7 Qe4h1+ Rc2c1 Qh1h7+ Rc1c2 Qh7e4 Ba4c6 Qe4e1+ Rc2c1 Qe1d2 Rc1c2 Qd2d1+ Rc2c1 Qd1b3+
10 00:00 90.792 341.805 +M7 Qe4h1+ Rc2c1 Qh1h7+ Rc1c2 Qh7e4 Ba4c6 Qe4e1+ Rc2c1 Qe1d2 Rc1c2 Qd2d1+ Rc2c1 Qd1b3+
Good!
Spark is able to solve it too!
FEN: 8/8/p7/p7/b3Q3/K7/p1r5/rk6 w - - 0 1
Spark-1.0-win32-mp:
1 00:00 27 0 0,00 Qe4h1+ Rc2c1 Qh1e4+ Rc1c2
2/4 00:00 245 0 0,00 Qe4h1+ Rc2c1 Qh1e4+ Rc1c2
3/6 00:00 541 0 0,00 Qe4h1+ Rc2c1 Qh1e4+ Rc1c2
4/9 00:00 1.818 0 0,00 Qe4h1+ Rc2c1 Qh1e4+ Rc1c2
5/10 00:00 4.500 0 0,00 Qe4h1+ Rc2c1 Qh1e4+ Rc1c2
6/12 00:00 8.088 0 0,00 Qe4h1+ Rc2c1 Qh1e4+ Rc1c2
7/14 00:00 14.451 0 0,00 Qe4h1+ Rc2c1 Qh1e4+ Rc1c2
8/16 00:00 26.471 0 0,00 Qe4h1+ Rc2c1 Qh1e4+ Rc1c2
9/18 00:00 50.248 0 0,00 Qe4h1+ Rc2c1 Qh1e4+ Rc1c2
12/27 00:00 1.258.198 1.547.599 +0,11 Qe4e5 Rc2d2 Qe5e1+ Kb1c2 Qe1xa1 Ba4b5 Qa1xa2+ Kc2c3 Qa2a1+ Kc3d3 Qa1b1+ Kd3d4 Qb1g1+ Kd4c4 Qg1g4+ Rd2d4 Qg4c8+ Kc4d3 Qc8h3+ Kd3d2
13/27 00:01 1.570.672 1.521.968 +0,10 Qe4e5 Rc2d2 Qe5e1+ Kb1c2 Qe1xa1 Ba4b5 Qa1xa2+ Kc2d1 Qa2b1+ Kd1e2 Qb1e4+ Ke2f2 Qe4f4+ Kf2e2 Qf4g4+ Ke2f2 Qg4f5+ Kf2e1 Qf5e5+ Ke1d1 Qe5a1+ Kd1e2 Qa1f6 Rd2d3+ Ka3a2 a5a4
13/27+ 00:01 1.593.692 1.544.275 +0,81 Qe4h1+ Rc2c1
13/27+ 00:01 1.594.025 1.544.597 +M9 Qe4h1+ Rc2c1
13/27 00:01 1.671.366 1.527.756 +M7 Qe4h1+ Rc2c1 Qh1h7+ Rc1c2 Qh7e4 Ba4b3 Qe4e1+ Rc2c1 Qe1d2 Bb3c2 Qd2c3 Bc2d1 Qc3b2+
14/27 00:01 2.551.536 1.683.071 +M7 Qe4h1+ Rc2c1 Qh1h7+ Rc1c2 Qh7e4 Ba4b3 Qe4e1+ Rc2c1 Qe1d2 Bb3c2 Qd2c3 Bc2d1 Qc3b2+
15/27 00:01 2.953.748 1.733.420 +M7 Qe4h1+ Rc2c1 Qh1h7+ Rc1c2 Qh7e4 Ba4b3 Qe4e1+ Rc2c1 Qe1d2 Bb3c2 Qd2c3 Bc2d1 Qc3b2+
16/27 00:01 3.343.654 1.768.193 +M7 Qe4h1+ Rc2c1 Qh1h7+ Rc1c2 Qh7e4 Ba4b3 Qe4e1+ Rc2c1 Qe1d2 Bb3c2 Qd2c3 Bc2d1 Qc3b2+
17/27 00:02 3.763.796 1.810.387 +M7 Qe4h1+ Rc2c1 Qh1h7+ Rc1c2 Qh7e4 Ba4b3 Qe4e1+ Rc2c1 Qe1d2 Bb3c2 Qd2c3 Bc2d1 Qc3b2+
18/27 00:02 4.182.346 1.845.695 +M7 Qe4h1+ Rc2c1 Qh1h7+ Rc1c2 Qh7e4 Ba4b3 Qe4e1+ Rc2c1 Qe1d2 Bb3c2 Qd2c3 Bc2d1 Qc3b2+
19/27 00:02 4.606.781 1.865.848 +M7 Qe4h1+ Rc2c1 Qh1h7+ Rc1c2 Qh7e4 Ba4b3 Qe4e1+ Rc2c1 Qe1d2 Bb3c2 Qd2c3 Bc2d1 Qc3b2+
20/27 00:02 5.031.515 1.883.052 +M7 Qe4h1+ Rc2c1 Qh1h7+ Rc1c2 Qh7e4 Ba4b3 Qe4e1+ Rc2c1 Qe1d2 Bb3c2 Qd2c3 Bc2d1 Qc3b2+
21/27 00:02 5.455.819 1.907.629 +M7 Qe4h1+ Rc2c1 Qh1h7+ Rc1c2 Qh7e4 Ba4b3 Qe4e1+ Rc2c1 Qe1d2 Bb3c2 Qd2c3 Bc2d1 Qc3b2+
23/27 00:03 6.305.541 1.921.249 +M7 Qe4h1+ Rc2c1 Qh1h7+ Rc1c2 Qh7e4 Ba4b3 Qe4e1+ Rc2c1 Qe1d2 Bb3c2 Qd2c3 Bc2d1 Qc3b2+
26/27 00:03 7.580.080 1.956.149 +M7 Qe4h1+ Rc2c1 Qh1h7+ Rc1c2 Qh7e4 Ba4b3 Qe4e1+ Rc2c1 Qe1d2 Bb3c2 Qd2c3 Bc2d1 Qc3b2+
26/27 00:03 7.764.630 1.956.318 +M7 Qe4h1+ Rc2c1 Qh1h7+ Rc1c2 Qh7e4 Ba4b3 Qe4e1+ Rc2c1 Qe1d2 Bb3c2 Qd2c3 Bc2d1 Qc3b2+
Thinker is a WinBoard engine and does not show output moves in the analysis; I set a game in fifteen minutes and let it play: in 15 seconds (in spite of 16 shown), just do nodes/(nodes/sec.), it played Qh1+ giving a mate eval of +M106 (which means mate in seven):
Code: Select all
FEN: 8/8/p7/p7/b7/K7/p1r5/rk5Q b - - 1 1
SP-x86-Inert---Thinker:
Qe4-h1
63 00:16 22.801.968 1.520.131 +M106 e4h1 c2c1 h1h2
Forcing each move, Thinker 5.4D Inert played 1.- Qh1+, Rc1; 2.- Qh7+, Rc2; 3.- Qe4, Bc6; 4.- Qe1+, Rc1; 5.- Qd2, Rc2; 6.- Qd1+, Rc1; 7.- Qb3#. As you see, each engine gives different continuations, all of them valid.
OTOH, I proved Thinker in the other position, and it failed under the same conditions (it spent more less 30.81 seconds in this move):
Code: Select all
FEN: 6QK/3p1p2/1pbPkB2/4Ppp1/2p4N/2p5/R2P1R1n/8 b - - 0 1
SP-x86-Inert---Thinker:
Ra8xa2
10 00:31 17.945.773 582.465 +25,77 a8a2 g5h4 g8e8 e6d5 e8f7 d5d4
Regards from Spain.
Ajedrecista.