Author: Jeroen van Dorp
Date: 14:38:40 04/25/01
Go up one level in this thread
On April 25, 2001 at 14:46:14, Dann Corbit wrote: >Positional evaluation terms are included in all the good chess engines. I think >that Shredder is very good at it. I received Shredder 5 recently and was impressed at the growth in strenght and insight. I picked up this piece from the newspaper (no fixed solution, but just "white wins") and tried to solve it. [D]5q2/n2P1k2/2b5/8/8/3N4/4BK2/6Q1 w - - 0 1 Personally I came no further than 1. Ke1, so I tried my chess engines, amongst them Shredder 4. They all pondered on Ke1 also for some time, then switched to Bh5+ with a relatively low evaluation. Shredder 4 was the only one considering Qg5. I couldn't find a real winning combination. Here's Shredder 4's output for a arbitrary two minutes 6 -> 0:01.89 +1.70 1.Ke1 Bxd7 2.Qxa7 Qd6 3.Qf2+ Ke6 4.Qa7 (381.720) 201.0 7.01 0:02.43 +1.45-- 1.Ke1 Bxd7 2.Bh5+ Kf6 3.Qd4+ Kg5 4.Qe3+ Kxh5 5.Qe2+ Kg5 6.Qh5+ Kxh5 7.Nf4+ Qxf4 (484.618) 198.6 7.01 0:02.55 +1.45 1.Ke1 Bxd7 2.Bh5+ Kf6 3.Qd4+ Kf5 4.Qxd7+ Kg5 5.Qxa7 Qb4+ 6.Nxb4 (508.732) 199.1 7.03 0:05.18 +1.46++ 1.Bh5+ Ke7+ 2.Ke1 Qh6 3.Qc5+ Kxd7 4.Qxa7+ Bb7 5.Qxb7+ Kd6 6.Bg4 Qc1+ 7.Nxc1 (976.119) 188.2 7.03 0:06.12 +1.80 1.Bh5+ Ke7+ 2.Ke1 Qf6 3.Qc5+ Kxd7 4.Qxa7+ Kd6 5.Qc5+ Kc7 6.Qa5+ Kd6 7.Qd2 (1.130.258) 184.5 7 -> 0:07.63 +1.80 1.Bh5+ Ke7+ 2.Ke1 Qf6 3.Qc5+ Kxd7 4.Qxa7+ Kd6 5.Qc5+ Kc7 6.Qa5+ Kd6 7.Qd2 (1.404.855) 184.0 8.01 0:13.49 +1.80 1.Bh5+ Ke7+ 2.Ke1 Qh6 3.Qc5+ Kxd7 4.Qxa7+ Kd6 5.Qb8+ Ke7 6.Qc7+ Bd7 7.Qc5+ Kd8 8.Kf2 (2.208.854) 163.6 8 -> 0:22.97 +1.80 1.Bh5+ Ke7+ 2.Ke1 Qh6 3.Qc5+ Kxd7 4.Qxa7+ Kd6 5.Qb8+ Ke7 6.Qc7+ Bd7 7.Qc5+ Kd8 8.Kf2 (3.920.988) 170.7 9.01 0:34.63 +1.80 1.Bh5+ Ke7+ 2.Ke1 Qf6 3.Qc5+ Kxd7 4.Qxa7+ Kd6 5.Qc5+ Kc7 6.Qa5+ Kd6 7.Qb4+ Kc7 8.Qf4+ Qxf4 9.Nxf4 Kd6 10.Be2 (6.484.350) 187.2 9.04 0:45.72 +1.81++ 1.Qg5 Ke6+ 2.Kg1 Kd6 3.d8Q+ Bd7 (8.854.585) 193.6 9.04 0:47.67 +2.02 1.Qg5 Ke6+ 2.Kg1 Kxd7 3.Nc5+ Kc8 4.Ba6+ Kb8 5.Ne6 Qd6 6.Qg8+ Nc8 7.Qxc8+ Ka7 (9.340.668) 195.9 9 -> 0:53.82 +2.02 1.Qg5 Ke6+ 2.Kg1 Kxd7 3.Nc5+ Kc8 4.Ba6+ Kb8 5.Ne6 Qd6 6.Qg8+ Nc8 7.Qxc8+ Ka7 (10.759.510) 199.8 10.01 0:58.45 +2.03 1.Qg5 Ke6+ 2.Kg1 Kxd7 3.Nc5+ Kc8 4.Ba6+ Kb8 5.Qg3+ Ka8 6.Ne6 Qf3 7.Qg8+ Nc8 8.Qxc8+ Ka7 (11.797.233) 201.8 10 -> 1:45.57 +2.03 1.Qg5 Ke6+ 2.Kg1 Kxd7 3.Nc5+ Kc8 4.Ba6+ Kb8 5.Qg3+ Ka8 6.Ne6 Qf3 7.Qg8+ Nc8 (23.110.373) 218.8 11.01 1:49.05 +2.28++ 1.Qg5 Ke6+ 2.Kg1 Kd6 (23.899.859) 219.1 11.01 1:49.53 +2.78++ 1.Qg5 Ke6+ 2.Kg1 Kd6 3.d8Q+ Bd7 4.Qxf8+ Ke6 5.Ne5 Bc8 6.Bg4+ Kd5 7.Bxc8 Nxc8 8.Qxc8 (24.011.586) 219.2 Here's Shredder 5's output for two minutes thinking 7.01 0:00 +8.32 1.Qg5 Ke6+ 2.Kg1 Kxd7 3.Nc5+ Kc8 4.Ba6+ Kb8 (48.794) 154.9 8.01 0:01 +8.32 1.Qg5 Ke6+ 2.Kg1 Kxd7 3.Nc5+ Kc8 4.Ba6+ Kb8 (308.829) 226.9 9.01 0:08 +8.32 1.Qg5 Ke6+ 2.Kg1 Kxd7 3.Nc5+ Kc8 4.Ba6+ Kb8 (2.132.109) 237.1 10.01 1:48 +8.26 1.Qg5 Bxd7 2.Nf4 Bg4 3.Bxg4 Ke8 4.Qe5+ Qe7 5.Qb8+ Qd8 6.Bh5+ Kd7 7.Qxa7+ Qc7 8.Bg4+ Kc6 (18.244.235) 167.8 best move: Qg1-g5 time: 2:01.314 min n/s: 169.822 nodes: 20.601.375 TB: 28.058 Although I'm seriously unknown with the solution, I like the elegant locking up of the king with the help of the white bishop and knight. None of the other engines I tested came up with this solution, and Shredder 5 came up with it in such a hurry! Please enlighten me all if you found a (better and definitive) solution. J. (and at ply 16 this variation: 16.01 320:23 +8.65 1.Qg5 Ke6+ 2.Kg1 Kxd7 3.Nc5+ Kc8 4.Ba6+ Kb8 5.Qg3+ Ka8 6.Bb7+ Bxb7 7.Nd7 Nb5 8.Nxf8 Bd5 9.Qe5 Bc6 10.Ne6 (975.425.948) 50.7)
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