Author: Dieter Buerssner
Date: 17:01:58 01/09/03
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On January 08, 2003 at 17:56:21, John Merlino wrote: >On January 08, 2003 at 16:30:38, Jon Dart wrote: > >>This position came up in an offline test game, Arasan 6.2 vs. Lambchop 10.88: >> >> 1k6/q7/2Q5/r3pp2/6p1/8/5rPP/5RK1 w - - >> >>White can delay the inevitable with a series of checks, beginning with Qe8+, but >>eventually he will run out of checks and lose, I think. This is something that >>is typically hard for computers to see. Arasan (White) thought it was fine at >>this point. [...] >On a relatively slow P3-733, Chessmaster 9000 says: > >Time Depth Score Positions Moves [...] >7:37 6/13 -1.15 41238547 1.Qd6+ Kc8 2.Qc6+ Kd8 3.Qd6+ Ke8 > 4.Qe6+ Kf8 5.Qf6+ Kg8 6.Qg6+ Qg7 > 7.Qe8+ Qf8 8.Qxf8+ Kxf8 9.Kxf2 > Kg7 10.Re1 Ra2+ 11.Kg1 Kf6 12.Kf1 > >It appears that, if Black wants to avoid the draw by perpetual, he needs to >sacrifice the f2 rook, going into the endgame up one pawn, which may or may not >be winnable. I get similar results with Yace. No fail low in 8 hours, and various lines, where the Rf2 will be sacced. The branching factor is not good, but this is no surprise to me in this position for my engine. P4-2.53 GHz: 6.33 0:00 -0.98 1.Qe8+ Kc7 2.Qe7+ Kc6 3.Qe6+ Kb7 4.Qd7+ Ka6 5.Qd3+ Kb6 6.Qd6+ Kb5 7.Qxe5+ Ka4 8.Qe8+ Rb5 9.Rxf2 Qb6 (339.167) 727.8 7.01 0:01 -0.98 1.Qe8+ Kc7 2.Qe7+ Kc6 3.Qe6+ Kb7 4.Qd7+ Ka6 5.Qd3+ Kb6 6.Qd6+ Kb5 7.Qxe5+ Kb4 8.Qd6+ Kc4 9.Qc6+ Kb3 10.Qe6+ Kb2 11.Rxf2+ Kb1 (723.143) 708.9 7.33 0:01 -0.98 1.Qe8+ Kc7 2.Qe7+ Kc6 3.Qe6+ Kb7 4.Qd7+ Ka6 5.Qd3+ Kb6 6.Qd6+ Kb5 7.Qxe5+ Kb4 8.Qd6+ Kc4 9.Qc6+ Kb3 10.Qe6+ Kb2 11.Rxf2+ Kb1 (973.064) 710.7 8.01 0:03 -1.29 1.Qe8+ Kc7 2.Qe7+ Kc6 3.Qe6+ Kb7 4.Qd7+ Ka6 5.Qxa7+ Kxa7 6.Kxf2 f4 7.h4 Ra2+ 8.Kg1 Kb6 (2.408.129) 692.7 8.02 0:04 -1.28++ 1.Qd6+ Kc8 2.Qc6+ Kd8 3.Qd6+ Ke8 4.Qe6+ Kf8 5.Qf6+ Qf7 6.Qd8+ Kg7 7.Qg5+ Kh7 8.Kxf2 Ra2+ 9.Ke1 Qb7 10.Rxf5 Qxg2 (3.313.693) 696.4 8.02 0:07 -1.29-- 1.Qd6+ Kb7 2.Qd7+ Ka6 3.Qxa7+ Kxa7 4.Kxf2 f4 5.h4 gxh3 6.Rb1 hxg2 7.Kxg2 (5.486.311) 715.5 8.02 0:07 -1.29 1.Qe8+ Kc7 2.Qe7+ Kc6 3.Qe6+ Kb7 4.Qd7+ Ka6 5.Qxa7+ Kxa7 6.Kxf2 f4 7.h4 Ra2+ 8.Kg1 Kb6 (5.486.311) 715.5 8.33 0:08 -1.29 1.Qe8+ Kc7 2.Qe7+ Kc6 3.Qe6+ Kb7 4.Qd7+ Ka6 5.Qxa7+ Kxa7 6.Kxf2 f4 7.h4 Ra2+ 8.Kg1 Kb6 (5.810.643) 718.4 9.01 0:13 -1.34 1.Qe8+ Kc7 2.Qe7+ Kc6 3.Qe6+ Kb7 4.Qd7+ Ka6 5.Qxa7+ Kxa7 6.Kxf2 Ka6 7.h4 gxh3 8.gxh3 Rd5 (9.882.080) 741.3 9.02 0:15 -1.33++ 1.Qd6+ Kb7 2.Qd7+ Ka6 3.Qd3+ Kb6 4.Qd6+ Kb5 5.Qxe5+ Ka4 6.Qe8+ Kb4 7.Qf8+ Kc4 8.Qg8+ Kd4 9.Qh8+ Kc5 10.Kxf2 Qb7 (11.551.153) 737.1 9.02 0:17 -1.32 1.Qd6+ Kb7 2.Qd7+ Ka6 3.Qd3+ Kb6 4.Qd6+ Kb5 5.Qxe5+ Ka4 6.Qe8+ Kb4 7.Qf8+ Kc4 8.Qc8+ Kd3 9.Qe6 (12.818.995) 739.5 9.33 0:18 -1.32 1.Qd6+ Kb7 2.Qd7+ Ka6 3.Qd3+ Kb6 4.Qd6+ Kb5 5.Qxe5+ Ka4 6.Qe8+ Kb4 7.Qf8+ Kc4 8.Qc8+ Kd3 9.Qe6 (13.995.340) 737.8 10.01 0:36 -1.30 1.Qd6+ Kb7 2.Qd7+ Ka6 3.Qxa7+ Kxa7 4.Kxf2 f4 5.Re1 Rc5 6.h4 gxh3 7.gxh3 Rb5 (26.326.912) 726.7 10.33 0:42 -1.30 1.Qd6+ Kb7 2.Qd7+ Ka6 3.Qxa7+ Kxa7 4.Kxf2 f4 5.Re1 Rc5 6.h4 gxh3 7.gxh3 Rb5 (30.854.100) 727.6 11.01 3:24 -1.37 1.Qd6+ Kc8 2.Qc6+ Kd8 3.Qd6+ Ke8 4.Qe6+ Kf8 5.Qf6+ Kg8 6.Qg6+ Qg7 7.Qe8+ Kh7 8.Qh5+ Qh6 9.Qf7+ Kh8 10.Kxf2 Qb6+ 11.Kg3 Ra3+ (143.810.004) 703.0 11.33 4:33 -1.37 1.Qd6+ Kc8 2.Qc6+ Kd8 3.Qd6+ Ke8 4.Qe6+ Kf8 5.Qf6+ Kg8 6.Qg6+ Qg7 7.Qe8+ Kh7 8.Qh5+ Qh6 9.Qf7+ Kh8 10.Kxf2 Qb6+ 11.Kg3 Ra3+ (192.183.094) 701.5 12.01 8:19 -1.40 1.Qd6+ Kc8 2.Qc6+ Kd8 3.Qd6+ Ke8 4.Qe6+ Kf8 5.Qf6+ Kg8 6.Qg6+ Qg7 7.Qe8+ Kh7 8.Qh5+ Qh6 9.Qf7+ Kh8 10.Qe8+ Kg7 11.Qe7+ Kg6 12.Qe6+ Kh5 13.Qe8+ Qg6 14.Qh8+ (350.198.604) 701.1 12.33 10:51 -1.40 1.Qd6+ Kc8 2.Qc6+ Kd8 3.Qd6+ Ke8 4.Qe6+ Kf8 5.Qf6+ Kg8 6.Qg6+ Qg7 7.Qe8+ Kh7 8.Qh5+ Qh6 9.Qf7+ Kh8 10.Qe8+ Kg7 11.Qe7+ Kg6 12.Qe6+ Kh5 13.Qe8+ Qg6 14.Qh8+ (454.953.609) 698.4 13.01 29:00 -1.28 1.Qd6+ Kc8 2.Qc6+ Qc7 3.Qe6+ Kb7 4.Kxf2 Qb6+ 5.Qxb6+ Kxb6 6.Kg3 e4 7.Kf4 Rc5 8.Rd1 Kb5 (1.216.474.502) 698.9 13.33 34:48 -1.28 1.Qd6+ Kc8 2.Qc6+ Qc7 3.Qe6+ Kb7 4.Kxf2 Qb6+ 5.Qxb6+ Kxb6 6.Kg3 e4 7.Kf4 Rc5 8.Rd1 Kb5 (1.456.807.565) 697.6 14.01 128:08 -1.37 1.Qd6+ Kb7 2.Qd7+ Ka6 3.Qxa7+ Kxa7 4.Rxf2 f4 5.h4 gxh3 6.gxh3 Kb6 7.h4 Kc5 8.h5 Ra6 9.Re2 Ra1+ 10.Kf2 (1.149.149.538) 149.4 14.33 160:42 -1.37 1.Qd6+ Kb7 2.Qd7+ Ka6 3.Qxa7+ Kxa7 4.Rxf2 f4 5.h4 gxh3 6.gxh3 Kb6 7.h4 Kc5 8.h5 Ra6 9.Re2 Ra1+ 10.Kf2 (2.516.522.445) 260.9 15.01 467:44 -1.34 1.Qd6+ Kc8 2.Qc6+ Kd8 3.Qd6+ Ke8 4.Qe6+ Kf8 5.h4 gxh3 (2.789.280.794) 99.3 15.33 543:37 -1.34 1.Qd6+ Kc8 2.Qc6+ Kd8 3.Qd6+ Ke8 4.Qe6+ Kf8 5.h4 gxh3 6.Rxf2 (1.698.412.160) 52.0 Regards, Dieter
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