Author: Ernst Walet
Date: 10:04:28 01/15/00
Go up one level in this thread
On January 15, 2000 at 10:52:14, James Robertson wrote: >On January 15, 2000 at 03:41:15, blass uri wrote: > >>On January 15, 2000 at 01:19:48, Len Eisner wrote: >> >>>In the following position Junior 6 plays 88…Rd3+ which wins (mate in 15), but >>>the simple g4 wins much faster (mate in 8). Why do the tablebases prevent >>>Junior from finding the fastest mate? >>> >>>[D]6k1/8/8/6p1/b2K4/r7/8/8 b - - 0 88 >>> >>>Len >> >>1)Junior has not the KRBP vs K tablebases. >> >>2)Finding the fastest mate is not important for winning games so the programmers >>do not care about it. >> >>Junior plays the first mate it finds by search and not the fastest mate. > >You think it would be easier to find a mate in 8 than a mate in 15. > >James > >> >>Uri This is Shredder´s analysis with only the 4 piece tablebases installed so not having the right tablebase seems not relevant. adapting time! 8.01 0:00.65 +21.63 g4 Kd5 g3 Ke5 g2 Kf5 Re3 Kg5 g1Q+ Kh5 (121.634) 184.5 8 -> 0:01.12 +21.63 g4 Kd5 g3 Ke5 g2 Kf5 Re3 Kg5 g1Q+ Kh5 (226.942) 201.0 9.01 0:01.14 +21.88++ g4 Kd5 g3 Ke5 g2 Kf5 Re3 Kg5 g1Q+ Kh4 Kf7 (228.334) 199.5 9.01 0:01.22 +22.38++ g4 Kd5 g3 Ke5 g2 Kf5 Re3 Kg5 g1Q+ Kh4 Bd7 (240.873) 195.9 9.01 0:01.48 +22.39 g4 Kd5 g3 Ke5 g2 Kf5 Re3 Kf4 g1Q Kf5 Bc2+ Kf6 Kf8 (282.223) 189.5 9.12 0:03.85 +M24++ Kg7 Kc5 Rc3+ Kd5 Bd7 Kd4 Bc6 Ke5 Rd3 Ke6 Kf8 Kf6 Bd7 Ke5 Kg8 Ke4 Bc6+ Ke5 Kf7 Kf5 Bd7+ Ke4 Kf6 Kxd3 (728.003) 188.9 9.12 0:03.94 +M22 Kg7 Kc5 Rc3+ Kd5 Kf7 Kd6 Bc2 Ke5 Rd3 Kf5 Bd1 Ke5 Ba4 Ke4 Bc6+ Kf5 Bd7+ Ke4 Kf6 Kxd3 (749.842) 190.1 9.21 0:05.03 +M21++ Rc3 Kd5 Kf7 Kd6 Bc2 Ke5 Rd3 Kf5 Bd1 Ke5 Ba4 Ke4 Bc6+ Kf5 Bd7+ Ke4 Kf6 Kxd3 (873.485) 173.3 9.21 0:05.21 +M17 Rc3 Ke5 Rd3 Ke6 Kg7 Kf5 Kf8 Ke5 Kf7 Ke4 Bc6+ Kf5 Bd7+ Ke4 Kf6 Kxd3 (914.065) 175.2 9 -> 0:05.22 +M17 Rc3 Ke5 Rd3 Ke6 Kg7 Kf5 Kf8 Ke5 Kf7 Ke4 Bc6+ Kf5 Bd7+ Ke4 Kf6 Kxd3 (917.707) 175.5 10.01 0:05.63 +M16 Rc3 Ke5 Rd3 Ke6 Kg7 Kf5 Kf8 Ke5 Kf7 Ke4 Bc6+ Kf5 Bd7+ Ke4 Kf6 Kxd3 (1.008.937) 179.0 10 -> 0:08.10 +M16 Rc3 Ke5 Rd3 Ke6 Kg7 Kf5 Kf8 Ke5 Kf7 Ke4 Bc6+ Kf5 Be4+ Kg4 Bf5+ Kxf5 (1.601.750) 197.6 11.01 0:08.45 +M15 Rc3 Ke5 Kf7 Kd5 Kf6 Kd6 Bb3 Kd7 Be6+ Kd6 Rc7 Kxc7 (1.667.730) 197.2 11 -> 0:12.31 +M15 Rc3 Ke5 Kf7 Kd5 Kf6 Kd6 Bb3 (2.593.641) 210.6 12.01 0:13.87 +M15 Rc3 Ke5 Kf7 Kd5 Kf6 Kd6 Bb3 Kd7 Be6+ Kd6 Rc7 Kxc7 (2.969.477) 214.0 12.05 0:20.05 +M14++ g4 Kd5 g3 Ke5 g2 Kd4 g1Q+ Kd5 Bc6+ Ke5 Qg5+ Kd6 Qd5+ Kc7 Qd8+ Kxd8 (4.358.625) 217.2 12.05 0:25.32 +M9 g4 Kd5 g3 Ke5 g2 Kd4 g1Q+ Kc4 Bc6 Kb4 Ra4+ Kb3 Qc5 Kb2 Rb4+ Ka1 Qa5# (5.419.461) 213.9 12 -> 0:31.56 +M9 g4 Kd5 g3 Ke5 g2 Kd4 g1Q+ Kc4 Bc6 Kb4 Ra4+ Kb3 Qc5 Kb2 Rb4+ Ka1 Qa5# (6.883.639) 218.1
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