Author: Ignacio Santos Crespo
Date: 11:14:10 11/05/02
Go up one level in this thread
On November 05, 2002 at 06:19:40, Uri Blass wrote: >On November 05, 2002 at 05:34:41, Joachim Rang wrote: > >>On November 05, 2002 at 02:37:11, Uri Blass wrote: >> >>>On November 04, 2002 at 21:33:36, Rob Shultz wrote: >>> >>>>Shredder 6.02 comes up with the following line: >>>> >>>>New game >>>>1k6/8/8/8/8/5p1p/PPP5/6K1 w - - 0 1 >>>> >>>>Analysis by Shredder 6.02: >>>>1.b4 Kc7 2.a4 Kc6 3.a5 Kb5 4.c3 Ka6 5.c4 h2+ 6.Kxh2 f2 7.Kg2 f1Q+ 8.Kxf1 Kb7 >>>> +- (15.67) Depth: 30/42 00:14:47 844201kN, tb=4168129 >>>> >>>>(Shultz, Delmont 04.11.2002) >>>> >>>> >>>> >>>>New game >>>>1k6/8/8/8/8/5p1p/PPP5/6K1 w - - 0 1 >>>> >>>>Analysis by Hiarcs 8: >>>> -+ (-1.70) Depth: 20/44 00:10:16 151098kN, tb=296590 >>>>1.a4 Kb7 >>>> -+ (-1.95) Depth: 21/48 00:12:20 180842kN, tb=354248 >>>>1.a4 Kb7 2.b4 Ka7 3.b5 Kb6 4.c4 Kb7 5.a5 Kc7 6.a6 Kb6 7.c5+ Ka7 8.c6 Kb6 9.c7 >>>>Kxc7 10.a7 Kb7 11.b6 Ka8 12.Kf1 h2 13.Kf2 h1Q >>>> -+ (-7.27) Depth: 21/48 00:16:40 250066kN, tb=457173 >>>> >>>>(Shultz, Delmont 04.11.2002) >>> >>>Can you play a game between shredder and Hiarcs8 and post moves+evaluations? >>> >>>Uri >> >> >>that's not necessary: > >That is necessary to see when Shredder understands that white is lost. >> >>white is lost because he can't move his king, but the black king can stop all >>three connected passed pawns from white (!), because white neither can support >>its pawns with his king nor can put black into zugzwang (it is white who will be >>in zugzwang). White is forced to move its pawns forward until black will have >>all eaten them and then has to move its king which looses. >> >>This is another one of Eduards famous zugzwang-problems which are for most >>engines very hard. Congratulations! > >zugzwang is usually no problem in pawn endgame because engines do not use null >move pruing in pawn endgames. > >I was interested to know what wrong pruning shredder use in pawn endgame and I >am surprised if it is simple null move pruning. > >I expected mistakes by some special pruning algorithm for pawn endgames so I >thought that we can discover details about it by finding when it fails. > >Uri Analysis by Ruffian 1.0.1: 1.a3 ³ (-0.28) Profundidad: 1/1 00:00:01 1.a4 = (-0.22) Profundidad: 1/1 00:00:01 1.c4 = (-0.16) Profundidad: 1/1 00:00:01 1.Rf2 ² (0.37) Profundidad: 1/1 00:00:01 1.Rf2 h2 2.Rxf3 -+ (-6.14) Profundidad: 2/4 00:00:01 1.c4 Rc7 ³ (-0.36) Profundidad: 2/4 00:00:01 1.c4 Rc7 2.Rf2 ² (0.34) Profundidad: 3/7 00:00:01 1.c4 Rc7 2.b4 Rd6 ³ (-0.28) Profundidad: 4/7 00:00:01 1.c4 Rc7 2.b4 Rd6 3.Rf2 ² (0.42) Profundidad: 5/9 00:00:01 1.c4 Rc8 2.b4 Rc7 3.b5 Rb6 4.Rf2 = (0.05) Profundidad: 6/9 00:00:01 5kN 1.a4 Rc7 2.a5 Rb7 3.b4 Ra6 = (0.12) Profundidad: 6/9 00:00:01 7kN 1.a4 Rc7 2.a5 Rc6 3.b4 Rd5 4.Rf2 ± (0.72) Profundidad: 7/11 00:00:01 12kN 1.a4 Rc8 2.a5 Rc7 3.b4 Rc6 4.c4 Rd6 5.Rf2 ² (0.48) Profundidad: 8/15 00:00:01 26kN 1.c4 Rc7 2.b4 Rd7 3.c5 Re8 4.b5 Re7 5.Rf2 ² (0.70) Profundidad: 8/15 00:00:01 34kN 1.c4 Rc7 2.b4 Rb7 3.a4 Rb6 4.b5 Rc5 5.a5 Rd6 ± (0.88) Profundidad: 9/16 00:00:01 56kN 1.a4 Rc7 2.a5 Rc6 3.b4 Rb5 4.c4+ Ra6 5.c5 Rb5 ± (0.92) Profundidad: 9/16 00:00:01 80kN 1.a4 Rc7 2.a5 Rd6 3.a6 Rc6 4.b4 Rb6 5.b5 Ra7 ± (1.01) Profundidad: 10/17 00:00:01 106kN 1.a4 Rb7 2.b4 Rc6 3.b5+ Rc5 4.c3 Rd6 5.a5 Rd7 6.a6 Rc7 ± (1.34) Profundidad: 11/18 00:00:02 186kN 1.c4 Rc7 2.b4 Rd6 3.a4 Rc7 4.a5 Rc6 5.b5+ Rc5 6.a6 Rb6 7.c5+ ± (1.34) Profundidad: 11/19 00:00:02 250kN 1.c4 Rc7 2.b4 Rd6 3.a4 Rc7 4.a5 Rb7 5.b5 Rb8 6.c5 Rc7 7.a6 +- (1.52) Profundidad: 12/20 00:00:02 350kN 1.a4 Rb7 2.b4 Rc6 3.b5+ Rc5 4.c3 Rb6 5.c4 Rc5 6.a5 Rd6 7.Rf2 h2 +- (1.58) Profundidad: 12/20 00:00:02 415kN 1.a4 Rb7 2.b4 Rc6 3.a5 Rb5 4.c3 Ra6 5.c4 Rb7 6.b5 Rb8 7.c5 Rc7 8.a6 +- (1.52) Profundidad: 13/22 00:00:03 579kN 1.a4 Rb7 2.b4 Rb6 3.a5+ Rb5 4.c3 Rc4 5.a6 Rd3 6.a7 Re2 7.a8D f2+ 8.Rh2 f1D ± (1.35) Profundidad: 14/26 00:00:04 826kN 1.a4 Rb7 2.b4 Rb6 3.a5+ Rb5 4.c3 Rc4 5.a6 Rd3 6.a7 Re2 7.c4 f2+ 8.Rh2 Re3 9.c5 f1D 10.a8D +- (1.56) Profundidad: 15/26 00:00:06 1101kN 1.a4 +- (1.91) Profundidad: 16/26 00:00:07 1358kN 1.a4 ± (1.21) Profundidad: 16/28 00:00:09 1656kN 1.a4 Rb7 2.b4 Rb6 3.a5+ Ra6 4.c4 Ra7 5.b5 Rb7 6.a6+ Rb6 7.c5+ Ra7 8.c6 Rb6 9.a7 Rxa7 10.c7 Rb7 11.b6 Rc8 ± (0.97) Profundidad: 16/29 00:00:09 1762kN 1.a4 Rb7 2.b4 Rb6 3.a5+ Ra6 4.c4 Ra7 5.b5 Rb7 6.a6+ Rb6 7.c5+ Ra7 8.c6 Rb6 9.c7 Rxc7 10.a7 Rb7 11.b6 Ra8 12.Rf2 ± (1.07) Profundidad: 17/29 00:00:12 2193kN 1.a4 +- (1.42) Profundidad: 18/31 00:00:14 2460kN 1.a4 Rb7 2.b4 Rb6 3.a5+ Ra6 4.c4 Ra7 5.b5 Rb7 6.a6+ Rb6 7.c5+ Ra7 8.c6 Rb6 9.c7 Rxc7 10.a7 Rb7 11.b6 Ra8 12.Rf2 +- (1.77) Profundidad: 18/31 00:00:15 2705kN 1.a4 +- (1.42) Profundidad: 19/34 00:00:18 3216kN 1.a4 Rb7 2.b4 Rb6 3.a5+ Ra6 4.c4 Ra7 5.b5 Rb7 6.a6+ Rb6 7.c5+ Ra7 8.c6 Rb6 9.c7 Rxc7 10.a7 Rb7 11.b6 Ra8 12.b7+ Rxb7 13.Rf2 µ (-0.78) Profundidad: 19/35 00:00:22 3966kN 1.a4 µ (-1.13) Profundidad: 20/37 00:00:32 5717kN 1.a4 Rb7 2.b4 Rb6 3.a5+ Ra6 4.c4 Ra7 5.b5 Rb7 6.b6 Rc6 7.b7 Rxb7 8.c5 Rc6 9.a6 Rc7 10.a7 Rb7 11.c6+ Rxa7 12.Rf2 h2 13.c7 Rb7 -+ (-1.44) Profundidad: 20/37 00:00:33 6051kN 1.a4 -+ (-1.79) Profundidad: 21/37 00:00:42 7545kN 1.a4 Rb7 2.b4 Rb6 3.a5+ Ra6 4.c4 Ra7 5.b5 Rb7 6.b6 Rc6 7.b7 Rxb7 8.c5 Rc7 9.a6 Rc6 10.a7 Rb7 11.c6+ Rxa7 12.c7 -+ (-2.29) Profundidad: 21/37 00:00:44 8095kN 1.a4 -+ (-2.64) Profundidad: 22/38 00:00:53 10052kN 1.a4 Rb7 2.b4 Rb6 3.a5+ Ra6 4.c4 Ra7 5.b5 Rb7 6.a6+ Rb6 7.c5+ Ra7 8.c6 Rb6 9.c7 Rxc7 10.a7 Rb7 11.b6 Ra8 12.Rf2 h2 13.Rg3 h1D 14.Rf2 -+ (-5.96) Profundidad: 22/41 00:01:10 13404kN 1.a4 Rb7 2.b4 Rb6 3.a5+ Ra6 4.c4 Ra7 5.b5 Rb7 6.a6+ Rb6 7.c5+ Ra7 8.c6 Rb6 9.c7 Rxc7 10.a7 Rb7 11.b6 Ra8 12.Rf2 h2 13.Rg3 h1D 14.Rf2 Dg2+ 15.Re3 -+ (-6.26) Profundidad: 23/44 00:01:43 21752kN 1.a4 -+ (-6.61) Profundidad: 24/46 00:03:05 34798kN 1.a4 Rb7 2.b4 Rb6 3.a5+ Ra6 4.c4 Ra7 5.b5 Rb7 6.a6+ Rb6 7.c5+ Ra7 8.c6 Rb6 9.a7 Rxa7 10.c7 Rb7 11.b6 Rc8 12.Rf2 h2 13.Re3 f2 14.Re2 f1D+ 15.Rxf1 h1D+ 16.Re2 De4+ -+ (-7.63) Profundidad: 24/48 00:04:01 47761kN (Santos, Bilbao 05.11.2002)
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.