Author: Ernst Walet
Date: 12:25:22 06/10/00
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On June 10, 2000 at 04:23:17, blass uri wrote: > >Here is another test position that shows better the importance of knowledge >about passed pawns. > >I composed this position > >[D]Q3q3/4k3/8/5p2/2p5/8/P6P/4K3 w - - 0 1 > >avoid Qxe8+ > >Century1.2a(p450) can see in less than 5 minutes that Qxe8+ is losing but cannot >see a better move at least in the first 23 minutes. > >I believe that a good evaluation can help to see that white is losing after 2 >plies based on the squares of the pieces. > >humans do not know it without search but humans do not have the best evaluation. > >Uri Fritz6a is not quite doing well here, it takes 8 minutes 17 seconds to fail low (from a high score) and it did not find another move after 4 hours on a P3-450, 128MB hash. Q3q3/4k3/8/5p2/2p5/8/P6P/4K3 w - - 0 1 Analysis by Fritz 6: 1.Qxe8+ ² (0.59) Depth: 1/3 00:00:00 1.Qxe8+ Kxe8 2.Kd2 Ke7 3.Kc3 Ke6 ± (1.13) Depth: 5/8 00:00:00 1kN 1.Qxe8+ Kxe8 2.Kd2 Ke7 3.Kc3 Ke6 ± (1.13) Depth: 5/8 00:00:00 1kN 1.Qxe8+ Kxe8 2.Kd2 Ke7 3.Kc3 Ke6 ± (1.13) Depth: 5/8 00:00:00 1kN 1.Qxe8+ Kxe8 2.Kd2 Ke7 3.Kc3 Ke6 ± (1.13) Depth: 5/8 00:00:00 1kN 1.Qxe8+ Kxe8 2.Kd2 Ke7 3.Kc3 Ke6 ± (1.13) Depth: 5/8 00:00:00 1kN 1.Qxe8+ Kxe8 2.Kd2 Ke7 3.Kc3 Ke6 4.Kxc4 ± (1.00) Depth: 6/8 00:00:00 9kN 1.Qxe8+! ± (1.31) Depth: 7/10 00:00:00 45kN 1.Qxe8+! Kxe8 2.Kd2 f4 3.Kc3 f3 4.Kd2 c3+ +- (1.78) Depth: 7/10 00:00:00 47kN 1.Qxe8+! +- (1.47) Depth: 8/12 00:00:00 57kN 1.Qxe8+! Kxe8 2.Kd2 f4 3.Kc3 f3 4.Kd2 Ke7 5.a4 ± (0.91) Depth: 8/12 00:00:00 59kN 1.Qxe8+! ± (1.22) Depth: 9/13 00:00:01 501kN 1.Qxe8+ Kxe8 2.a4 c3 3.a5 Kd7 4.a6 c2 5.Kd2 c1Q+ ± (1.34) Depth: 9/14 00:00:01 508kN 1.Qxe8+ Kxe8 2.a4 Kd7 3.a5 c3 ± (1.16) Depth: 10/16 00:00:02 615kN 1.Qxe8+! +- (1.47) Depth: 11/19 00:00:05 1987kN 1.Qxe8+! Kxe8 2.a4 c3 3.a5 Kd7 +- (1.91) Depth: 11/19 00:00:06 2027kN 1.Qxe8+! +- (1.59) Depth: 12/18 00:00:07 2600kN 1.Qxe8+ Kxe8 2.a4 c3 3.a5 Kd7 4.a6 +- (1.47) Depth: 12/20 00:00:07 2625kN 1.Qxe8+! +- (1.78) Depth: 13/23 00:00:14 5190kN 1.Qxe8+! Kxe8 2.a4 f4 3.a5 Kd7 4.a6 Kc6 5.h4 Kb6 +- (4.00) Depth: 13/23 00:00:14 5286kN 1.Qxe8+-- +- (3.69) Depth: 14/21 00:00:21 8331kN, tb=2 1.Qxe8+ Kxe8 2.a4 Kd7 3.a5 Kc7 4.a6 Kb6 5.h4 Kxa6 +- (3.22) Depth: 14/25 00:00:22 8400kN, tb=2 1.Qxe8+! +- (3.53) Depth: 15/22 00:00:42 17365kN, tb=19 1.Qxe8+! Kxe8 2.a4 Kd7 3.a5 Kc7 4.a6 Kb6 5.h4 Kxa6 +- (4.28) Depth: 15/25 00:00:43 17535kN, tb=29 1.Qxe8+ Kxe8 2.a4 Kd7 3.a5 Kc7 4.h4 c3 5.a6 Kb6 +- (4.38) Depth: 16/25 00:01:29 37973kN, tb=146 1.Qxe8+ Kxe8 2.a4 Kd7 3.a5 Kc7 4.h4 c3 5.a6 f4 +- (4.66) Depth: 17/28 00:03:24 87564kN, tb=571 1.Qxe8+-- +- (4.34) Depth: 18/29 00:08:11 209411kN, tb=2342 1.Qxe8+ Kxe8 2.a4 Kd7 3.a5 c3 4.a6 Kc8 5.h4 f4 ± (0.97) Depth: 18/35 00:08:17 211407kN, tb=2798
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