Author: John Merlino
Date: 10:45:57 07/20/05
Go up one level in this thread
On July 20, 2005 at 13:39:06, Ignacio Santos Crespo wrote: >On July 20, 2005 at 11:22:29, Salvo Spitaleri wrote: > >>Where is the difficult for engines without tablebase? >> >>[d]8/p1r5/6k1/RK6/1P6/8/8/8 w - - 3 52 bm Ka6; >> >>52.Ka6, 53.Rb5, 54.Rb7 > >The position is mate in 39, but after 52.Ka6 Kf6 53.Rb5??? is draw; the correct >is 53.b5 or 53.Ra1 > >Ignacio. CM9_R1 on an AMD 2500 needs 0:21 to find 52.Ka6, followed by 53.b5. It gives a good score in just under a minute. Time Depth Score Positions Moves 0:00 1/8 -0.02 46013 52.Ka4 Kf6 53.Ka3 Ke6 54.Kb2 Rg7 55.Kc2 Rg4 56.Rxa7 Rxb4 0:00 2/9 -0.02 72630 52.Ka4 Kf6 53.Ka3 Ke6 54.Kb2 Rg7 55.Kc3 Rg3+ 56.Kd2 Rg4 57.Rxa7 Rxb4 0:00 3/10 -0.02 134906 52.Ka4 Kf6 53.Ka3 Ke6 54.Kb2 Kd6 55.Kb3 Rg7 56.Kc2 Rg4 57.Rxa7 Rxb4 0:01 4/11 -0.01 260699 52.Ka4 Kf6 53.Ka3 Ke6 54.Kb2 Kd6 55.Kb3 Rg7 56.Kc4 Rg4+ 57.Kd3 Rxb4 58.Rxa7 0:01 5/12 0.00 460347 52.Ka4 Kf6 53.Ka3 Ke6 54.Kb2 Kd6 55.Kb3 Rg7 56.Kc4 Rg4+ 57.Kb3 Rg3+ 58.Kc4 Rg4+ 0:02 6/13 0.00 964179 52.Ka4 Kf6 53.Ka3 Ke6 54.Kb2 Kd6 55.Kb3 Rg7 56.Kc4 Rg4+ 57.Kb3 Rg3+ 58.Kc4 Rg4+ 0:04 7/14 0.00 2007266 52.Ka4 Kf6 53.Ka3 Ke6 54.Kb2 Kd6 55.Kb3 Rg7 56.Kc4 Rg4+ 57.Kb3 Rg3+ 58.Kc4 Rg4+ 0:10 8/15 0.00 4818203 52.Ka4 Kf6 53.Ka3 Ke6 54.Kb2 Kd6 55.Kb3 Rg7 56.Kc4 Rg4+ 57.Kb3 Rg3+ 58.Kc4 Rg4+ 0:21 8/15 0.35 10475975 52.Ka6 Kf6 53.b5 Rd7 54.Ra2 Ke6 55.Rc2 Rf7 56.Rd2 Rc7 57.Rd8 Rf7 58.Ra8 Kd6 59.Rxa7 Rf8 0:28 9/16 0.47 14184158 52.Ka6 Kf6 53.b5 Rd7 54.Ra2 Ke6 55.Rc2 Ke7 56.Rc6 Kd8 57.Rh6 Rf7 58.Rh8+ Kc7 59.Kxa7 Rf6 60.Rh7+ Kc8 61.b6 0:56 10/17 1.36 28513872 52.Ka6 Kf6 53.b5 Rd7 54.Ra1 Ke6 55.Rc1 Ke7 56.Rc6 Kd8 57.Rg6 Kc7 58.Kxa7 Kc8+ 59.Ka6 Rd8 60.Rc6+ Kb8 61.Rb6+ Kc7 62.Rb7+ Kd6 1:31 11/18 1.47 48137334 52.Ka6 Kf6 53.b5 Rd7 54.Ra1 Ke6 55.Rc1 Ke7 56.Rc6 Kd8 57.Rh6 Kc7 58.Kxa7 Kc8+ 59.Ka8 Rd5 60.Rh8+ Kc7 61.Rh7+ Kb6 62.Rb7+ Kc5 63.b6 jm
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