Ed Trice wrote:The purpose of the test was to try and see if the time of 7:16 was "extraordinary" or not.
OK Ed, I did the 3 consecutive tests, on the same
Houdini 1.01 engine, but 32-bit and on my (lowly) Core 2 Duo @3GHz (2threads), 512 MB hash.
1st try: mate in 15 obtained in 26 minutes, at depth 31
2nd try: only mate in 62 reached after 12 and half hours, depth still only 29
3rd try: only mate in 29 reached after more than 6 hours, depth 30
Quite a good example of MP (basic) non-reproducibility...
And no, there was no thunder and lightning between tests!
New game
7r/kpr1b1pn/p3P3/q1p1N1p1/P1Qp2P1/1R5P/1PP1R1B1/6K1 w - - 0 1
Analysis by Houdini 1.01 w32 2_CPU:
1st try
1.Rxb7+ Rxb7 2.Nc6+ Kb6 3.Nxa5 Rc7 4.Bb7 Ra8 5.Bxa8 d3 6.Qxd3 Kxa5 7.Qxh7 c4 8.Qe4 Bc5+ 9.Kh2 g6 10.Qxg6 Bd6+ 11.Kg2 Be7 12.Qe8 Bf6 13.Rf2 Be5 14.Rf5 Rc5 15.Rxg5 Bxb2 16.Rxc5+ Kb4 17.e7 Ka3 18.Rxc4 Ka2 19.Qd7 a5 20.e8Q Kb1
+- (44.53) Depth: 23/71 00:11:10 2068mN
1.Rxb7+ Rxb7 2.Nc6+ Kb6 3.Nxa5 Rc7 4.Bb7 Ra8 5.Bxa8 d3 6.Qxd3 Kxa5 7.Qxh7 c4 8.Qe4 Bc5+ 9.Kh2 Bd6+ 10.Kg2 Be7 11.Qe5+ Rc5 12.Qxg7 Rc7 13.Bc6 Kb6 14.Bd7 Bd6 15.e7 Kb7 16.Qxg5 Rc5 17.Qxc5 Bxc5 18.e8Q Ka7
+- (#27) Depth: 24/71 00:12:41 2404mN
1.Rxb7+ Rxb7 2.Nc6+ Kb6 3.Nxa5 Rc7 4.Bb7 Ra8 5.Bxa8 d3 6.Qxd3 Kxa5 7.Qxh7 c4 8.Qe4 Bc5+ 9.Kh2 Bd6+ 10.Kg2 Be7 11.Qe5+ Rc5 12.Qxg7 Rc7 13.Bc6 Kb6 14.Bd7 Bd6 15.Qxg5 Rc5 16.Qd8+ Bc7 17.e7 Ka7 18.Qc8 Bd6 19.Qxc5+ Bxc5 20.e8Q Bd6 21.Qe3+ Kb7 22.Qe4+ Kb8 23.Qxc4 a5 24.Qc6 Ka7
+- (#28) Depth: 25/71 00:12:55 2452mN
1.Rxb7+ Rxb7 2.Nc6+ Kb6 3.Nxa5 Rc7 4.Bb7 Ra8 5.Bxa8 d3 6.Qxd3 c4 7.Qxh7 Kxa5 8.Qe4 Bc5+ 9.Kh2 g6 10.Qxg6 Bd6+ 11.Kg2 Re7 12.Qxg5+ Kb6 13.Qd5 Bb4 14.a5+ Ka7 15.Qxc4 Kxa8 16.Qxb4 Rb7 17.Qxb7+ Kxb7 18.e7 Kc6 19.e8Q+ Kd6 20.Qe7+ Kc6 21.Re6+ Kd5 22.Re5+ Kc6 23.Rc5#
+- (#23) Depth: 26/71 00:13:55 2665mN
1.Rxb7+ Rxb7 2.Nc6+ Kb6 3.Nxa5 Rc7 4.Bb7 Ra8 5.Bxa8 d3 6.Qxd3 c4 7.Qxh7 Kxa5 8.Qe4 c3 9.bxc3 Kb6 10.Qe5 Rc8 11.a5+ Ka7 12.Qxg7 Kxa8 13.Qxe7 Rb8 14.Qxg5 Rb1+ 15.Kg2 Rb8 16.e7 Re8 17.Qh5 Rc8 18.e8Q Kb7 19.Re7+ Kb8
+- (#21) Depth: 27/71 00:15:06 2921mN
1.Rxb7+ Rxb7 2.Nc6+ Kb6 3.Nxa5 Rc7 4.Bb7 Ra8 5.Bxa8 d3 6.Qxd3 Kxa5 7.Qc3+ Kb6 8.a5+ Ka7 9.Bg2 Kb8 10.Qb3+ Kc8 11.Qd5 Ra7 12.Qc6+ Kb8 13.Qb6+ Kc8 14.Qxa7 Bd6 15.Qb7+ Kd8 16.Qd7#
+- (#16) Depth: 28/71 00:17:27 3443mN
1.Rxb7+ Rxb7 2.Nc6+ Kb6 3.Nxa5 Rc7 4.Bb7 Ra8 5.Bxa8 d3 6.Qxd3 Kxa5 7.Qc3+ Kb6 8.a5+ Ka7 9.Bg2 Kb8 10.Qb3+ Kc8 11.Qd5 Ra7 12.Qc6+ Kb8 13.Qb6+ Kc8 14.Qxa7 Bd6 15.Qb7+ Kd8 16.Qd7#
+- (#16) Depth: 29/71 00:19:43 3956mN
1.Rxb7+ Rxb7 2.Nc6+ Kb6 3.Nxa5 Rc7 4.Bb7 Ra8 5.Bxa8 Nf6 6.Bb7 Rxb7 7.Qb3+ Kxa5 8.Qxb7 Nd5 9.Qxd5 d3 10.cxd3 Kb6 11.Qd7 Bf6 12.e7 Bd4+ 13.Kg2 g6 14.e8Q c4 15.Qxd4+ Kb7 16.Re7#
+- (#16) Depth: 30/71 00:22:21 4565mN
1.Rxb7+ Rxb7 2.Nc6+ Kb6 3.Nxa5 Rc7 4.Bb7 Ra8 5.Bxa8 Nf6 6.Nc6 Rxc6 7.a5+ Kc7 8.Qb3 c4 9.Qb7+ Kd8 10.Qxc6 d3 11.Qb6+ Ke8 12.Bc6+ Nd7 13.Bxd7+ Kf8 14.Qb8+ Bd8 15.Qxd8#
+- (#15) Depth: 31/71 00:26:33 5545mN 3481 kN/s
1.Rxb7+ Rxb7 2.Nc6+ Kb6 3.Nxa5 Rc7 4.Bb7 Ra8 5.Bxa8 Nf6 6.Nc6 Rxc6 7.a5+ Kc7 8.Qb3 c4 9.Qb7+ Kd8 10.Qxc6 d3 11.Qb6+ Ke8 12.Bc6+ Nd7 13.Bxd7+ Kf8 14.Qb8+ Bd8 15.Qxd8#
+- (#15) Depth: 32/71 00:30:19 6410mN
2nd try
1.Rxb7+ Rxb7 2.Nc6+ Kb6 3.Nxa5 Rc7 4.Nb3 Ka7 5.Nxd4 Rb8 6.Nc6+ Rxc6 7.Bxc6 Nf6 8.Qc3 Rc8 9.Bg2 Rd8 10.Rd2 Rxd2 11.Qxd2 Kb6 12.Qxg5 Kc7 13.Qxg7 Kd6 14.Qf7 Nd7 15.exd7 Kxd7 16.Qd5+ Bd6 17.Qb7+ Kd8 18.Qxa6 Kd7
+- (28.38) Depth: 27/122 10:33:58 124763mN
1.Rxb7+ Rxb7 2.Nc6+ Kb6 3.Nxa5 Rc7 4.Nb3 Ka7 5.Nxd4 Rb8 6.Nc6+ Rxc6 7.Bxc6 Nf6 8.Qc3 Rg8 9.Bg2 Rd8 10.Rd2 Rxd2 11.Qxd2 Kb6 12.Qxg5 Kc7 13.Qxg7 Kd6 14.Qf7 Nd7 15.exd7 Kxd7 16.Qf5+ Kc7 17.Qe4 Bg5 18.Qc6+ Kd8 19.Qd5+ Kc8 20.Qf5+
+- (#55) Depth: 28/122 12:25:29 151969mN
1.Rxb7+ Rxb7 2.Nc6+ Kb6 3.Nxa5 Rc7 4.Nb3 Ka7 5.Nxd4 Rb8 6.Nc6+ Rxc6 7.Bxc6 Nf6 8.Qc3 Rc8 9.Bg2 Rd8 10.Rd2 Rxd2 11.Qxd2 Kb6 12.Qxg5 Kc7 13.Qxg7 Kd6 14.Qf7 Nd7 15.exd7 Kxd7 16.Qf5+ Kc7 17.Qe4 Bh4 18.Qh7+ Kd6 19.Qxh4 Ke6
+- (#62) Depth: 29/122 12:33:47 153908mN 3403 kN/s
3rd try
1.Rxb7+ Rxb7 2.Nc6+ Kb6 3.Nxa5 Rc7 4.Nb3 Nf6 5.Nxd4 Rd8 6.Qb3+ Ka7 7.Nc6+ Rxc6 8.Bxc6 Rb8 9.Qc3 Rb4 10.a5 Kb8 11.Qe5+ Kc8 12.Qxg5 g6 13.c3 Rb8 14.Qxg6 Kc7 15.Qf7 Ng8 16.Be8 c4 17.Qxg8 Bc5+ 18.Kh2 Rc8
+- (35.15) Depth: 27/93 05:18:59 65302mN
1.Rxb7+ Rxb7 2.Nc6+ Kb6 3.Nxa5 Rc7 4.Nb3 Nf6 5.Nxd4 Rd8 6.Qb3+ Ka7 7.Nc6+ Rxc6 8.Bxc6 Rb8 9.Qc3 Rb4 10.a5 Kb8 11.Qe5+ Kc8 12.Qxg5 g6 13.Qxg6 Kc7 14.Qg7 Kd6 15.Rd2+ Rd4 16.Rxd4+ cxd4 17.g5 Ng8 18.Qxg8 Kxc6 19.Qe8+ Kd6 20.Qd7+ Ke5 21.Qxe7
+- (#30) Depth: 28/93 05:54:01 74411mN
1.Rxb7+ Rxb7 2.Nc6+ Kb6 3.Nxa5 Rc7 4.Nb3 Nf6 5.Nxd4 Rd8 6.Qb3+ Ka7 7.Nc6+ Rxc6 8.Bxc6 Rb8 9.Qc3 Rb4 10.a5 Kb8 11.Qe5+ Kc8 12.Qxg5 g6 13.Qxg6 Kc7 14.Qg7 Kd6 15.Rd2+ Rd4 16.Rxd4+ cxd4 17.g5 Ng8 18.Qxg8 Kc5 19.Qf7 Kxc6 20.Qxe7 d3
+- (#32) Depth: 29/93 05:55:16 74708mN
1.Rxb7+ Rxb7 2.Nc6+ Kb6 3.Nxa5 Rc7 4.Nb3 Nf6 5.Nxd4 Rd8 6.Qb3+ Ka7 7.Nc6+ Rxc6 8.Bxc6 Rb8 9.Qc3 Rb4 10.a5 Kb8 11.Qe5+ Kc8 12.Qxg5 g6 13.Qxg6 Kc7 14.Qg7 Kd6 15.Rd2+ Rd4 16.Rxd4+ cxd4 17.g5 Ng8 18.Qxg8 Kxc6 19.Qe8+ Kd6 20.Qd7+ Ke5 21.Qxe7
+- (#29) Depth: 30/93 06:17:19 80117mN 3539 kN/s