Author: Uri Blass
Date: 11:55:44 03/31/01
Go up one level in this thread
On March 31, 2001 at 12:53:29, Tony Werten wrote: >On March 31, 2001 at 09:22:57, Ferdinand S. Mosca wrote: > >>Hi everyone, >> >>A position from an actual game which caught my interest while >>playing an engine match at G60. >> >>[D]3r4/5k2/5p2/6pp/5p2/1p6/p2R4/K3R3 b - - 0 1 >>Is there any program that can evaluate this simple ending logically. >> >>The trap here is the move ...Rxd2, this may not win but it only draws. >>There is perpetual check and stalemate if black plays ...Rxd2. Many programs >>probably find the perpetual coming, but at what time do your favorite programs >>give a 0.0 or near 0.0 score? > >Are you sure ? Result of XiniX: (running in kind of debug so it's even slower >than normal ) > >18/34 35,825 565s 125 Kn/s 1. .. Rxd2 2.Re7+ Kg6 3.Rg7+ Kf5 4.Rxg5+ Ke6 5.Re5+ >Kd6 6.Re6+ Kc7 7.Re7+ Rd7 8.Re1 f3 9.Kb2 f2 10.Rf1 Re7 It is obvious that 7.Rc6+ is better than 7.Re7+ I think that it is better to let xinix to play against itself in order to check if it is a draw before asking. Here is some analysis by Deep Fritz I asked it for the next best move and this is the reason that it got down from depth 20 to depth 1. I did not use most of the tablebases but Deep Fritz shows some tablebase hits inspite of it. New position 3r4/5k2/5p2/6pp/5p2/1p6/p2R4/K3R3 b - - 0 1 Analysis by Deep Fritz: 1...Rxd2! -+ (-6.41) Depth: 1/2 00:00:00 1...Rxd2! -+ (-9.53) Depth: 1/2 00:00:00 1...Rxd2 2.Rf1 -+ (-9.59) Depth: 2/5 00:00:00 1...Rxd2 2.Rh1 h4 -+ (-9.78) Depth: 3/6 00:00:00 1...Rxd2! -+ (-10.16) Depth: 4/8 00:00:00 1...Rxd2 2.Rh1 g4 3.Rf1 f3 -+ (-10.16) Depth: 5/12 00:00:00 1kN 1...Rxd2! -+ (-10.47) Depth: 6/13 00:00:00 2kN 1...Rxd2! 2.Re7+ Kg6 3.Re1 g4 4.Rh1 Kg5 -+ (-10.56) Depth: 6/14 00:00:00 3kN 1...Rxd2-- -+ (-10.19) Depth: 7/14 00:00:00 6kN 1...Rxd2-- 2.Re7+ Kf8 3.Re8+ Kg7 -+ (-9.84) Depth: 7/19 00:00:00 10kN 1...Rxd2 2.Re7+ Kf8 3.Re8+ Kg7 4.Re7+ Kg8 -+ (-9.66) Depth: 8/21 00:00:00 15kN 1...Rxd2-- -+ (-9.34) Depth: 9/20 00:00:00 25kN 1...Rxd2-- 2.Re7+ Kg6 3.Rg7+ Kf5 4.Rxg5+ Ke4 5.Rg1 f3 6.Rh1 f2 -+ (-9.16) Depth: 9/22 00:00:00 32kN 1...Rxd2-- -+ (-8.84) Depth: 10/22 00:00:00 48kN 1...Rxd2-- 2.Re7+ Kg6 3.Rg7+ Kf5 4.Rxg5+ Ke6 5.Re5+ Kd7 6.Re7+ Kc6 7.Re6+ -+ (-8.41) Depth: 10/25 00:00:00 68kN 1...Rxd2-- -+ (-8.09) Depth: 11/25 00:00:00 108kN 1...Rxd2-- -+ (-8.09) Depth: 11/27 00:00:00 125kN 1...Rxd2! -+ (-8.41) Depth: 12/29 00:00:00 218kN 1...Rxd2! 2.Re7+ Kg6 3.Rg7+ Kf5 4.Rxg5+ Ke6 5.Re5+ Kd6 6.Re6+ Kc5 7.Re5+ -+ (-8.47) Depth: 12/29 00:00:00 250kN 1...Rxd2-- -+ (-8.16) Depth: 13/29 00:00:00 433kN 1...Rxd2-- 2.Re7+ Kg6 3.Rg7+ Kf5 4.Rxg5+ Ke6 5.Re5+ Kd6 6.Re6+ Kc7 7.Re7+ -+ (-7.78) Depth: 13/29 00:00:00 485kN 1...Rxd2 2.Re7+ Kg6 3.Rg7+ Kf5 4.Rxg5+ Ke6 5.Re5+ Kd6 6.Re6+ Kc7 7.Re7+ -+ (-7.81) Depth: 14/30 00:00:01 872kN 1...Rxd2 2.Re7+ Kg6 3.Rg7+ Kf5 4.Rxg5+ Ke6 5.Re5+ Kd6 6.Re6+ Kc7 7.Rc6+ -+ (-7.81) Depth: 15/32 00:00:03 2164kN 1...Rxd2-- -+ (-7.50) Depth: 16/33 00:00:05 3852kN 1...Rxd2-- 2.Re7+ Kg6 3.Rg7+ Kf5 4.Rxg5+ Ke6 5.Re5+ Kd6 6.Re6+ Kc7 7.Rc6+ -+ (-6.97) Depth: 16/36 00:00:06 4566kN 1...Rxd2 2.Re7+ Kg6 3.Rg7+ Kf5 4.Rxg5+ Ke6 5.Re5+ Kd6 6.Re6+ Kc7 7.Rc6+ -+ (-6.72) Depth: 17/35 00:00:15 11055kN 1...Rxd2-- -+ (-6.41) Depth: 18/41 00:00:42 30320kN, tb=1 1...Rxd2-- 2.Re7+ Kg6 3.Rg7+ Kf5 4.Rxg5+ Ke6 5.Re5+ Kd6 6.Re6+ Kc7 7.Rc6+ -+ (-6.13) Depth: 18/41 00:00:45 32559kN, tb=1 1...Rxd2 2.Re7+ Kg6 3.Rg7+ Kf5 4.Rxg5+ Ke6 5.Re5+ Kd6 6.Re6+ Kc7 7.Rc6+ -+ (-6.09) Depth: 19/42 00:02:35 113283kN, tb=2 1...Rxd2-- -+ (-5.78) Depth: 20/45 00:06:45 298974kN, tb=7 1...Rxd2-- -+ (-5.78) Depth: 20/45 00:06:51 303275kN, tb=7 1...b2+! -+ (-1.69) Depth: 1/3 00:08:09, tb=9 1...b2+! 2.Rxb2 -+ (-2.47) Depth: 1/3 00:08:09, tb=9 1...Rb8! -+ (-3.03) Depth: 1/4 00:08:09, tb=9 1...Rb8! -+ (-4.44) Depth: 1/4 00:08:09, tb=9 1...Rb8 2.Rb2 -+ (-4.16) Depth: 2/5 00:08:09, tb=9 1...Ra8! -+ (-4.19) Depth: 2/5 00:08:09, tb=9 1...Ra8 2.Rb2 Ra3 -+ (-4.19) Depth: 3/10 00:08:09, tb=9 1...Rb8! -+ (-4.22) Depth: 3/10 00:08:09, tb=9 1...Rb8! 2.Rd7+ -+ (-4.25) Depth: 3/10 00:08:09, tb=9 1...Rb8 2.Rh2 h4 3.Kb2 -+ (-4.38) Depth: 4/8 00:08:09 1kN, tb=9 1...Rb8 2.Kb2 f3 3.Rd7+ Kg6 4.Rde7 -+ (-4.34) Depth: 5/12 00:08:09 2kN, tb=9 1...Rb8-- -+ (-4.03) Depth: 6/14 00:08:09 8kN, tb=9 1...Rb8-- -+ (-4.03) Depth: 6/14 00:08:09 8kN, tb=9 1...Rb8 2.Rd7+ Kg6 3.Rd3 h4 4.Kb2 g4 5.Rxb3 -+ (-3.91) Depth: 7/16 00:08:09 19kN, tb=9 1...Rb8 2.Kb2 h4 3.Rd3 g4 4.Rxb3 Ra8 5.Ra1 -+ (-3.66) Depth: 8/19 00:08:09 55kN, tb=9 1...Rb8 2.Kb2 g4 3.Rd7+ Kg6 4.Rd3 h4 5.Rxb3 Ra8 6.Ra1 -+ (-3.81) Depth: 9/18 00:08:09 156kN, tb=9 1...Rb8 2.Rh1 h4 3.Kb2 f5 4.Rd3 Ra8 5.Rxb3 g4 6.Ra1 -+ (-3.81) Depth: 10/22 00:08:10 449kN, tb=9 1...Rb8 2.Rf1 Rb4 3.Kb2 g4 4.Kc3 Rb7 5.Rb2 h4 -+ (-3.84) Depth: 11/24 00:08:12 1711kN, tb=9 1...Rb8-- -+ (-3.53) Depth: 12/25 00:08:13 2648kN, tb=9 1...Rb8-- -+ (-3.53) Depth: 12/26 00:08:14 2802kN, tb=9 1...Rb8 2.Rf1 h4 3.Rf3 g4 4.Rxf4 f5 5.Rxf5+ Ke6 6.Rf4 -+ (-3.25) Depth: 13/28 00:08:20 6931kN, tb=9 1...Rb8 2.Rf1 Rb4 3.Kb2 g4 4.Rd7+ Kg6 5.Rd3 f3 -+ (-3.44) Depth: 14/28 00:08:40 20173kN, tb=9 1...Rb8-- -+ (-3.13) Depth: 15/32 00:08:56 31059kN, tb=9 1...Rb8-- -+ (-3.13) Depth: 15/32 00:09:01 34484kN, tb=9 1...Rb8! -+ (-3.44) Depth: 16/32 00:10:07 79244kN, tb=9 1...Rb8! 2.Rf1 Rb4 3.Kb2 g4 4.Rd5 Kg6 5.Rh1 f3 6.Rdxh5 f5 -+ (-3.69) Depth: 16/33 00:11:33 137438kN, tb=9 1...Rb8-- -+ (-3.38) Depth: 17/34 00:15:51 304328kN, tb=10 1...Rb8-- -+ (-3.38) Depth: 17/34 00:16:00 310502kN, tb=10 (blass, tel-aviv 31.03.2001)
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