Author: Álvaro Begué
Date: 10:06:40 08/25/04
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On August 25, 2004 at 12:52:46, Volker Böhm wrote: > >Hi, > >the following position of the iq - test (position 166) cannot be solved from >spike in reasonalbe time (> 2h): > >[D]r4r1k/6pp/3p3b/1p1Npb2/3nB2q/2N3P1/PP3P1P/R2Q1RK1 b - - 0 1 > >(The move to find is Qxe4) > >The reason is a nullmove-problem. After the queen-sac there are many moves that >leads to a mate-thread. But one queen back spike tends to prune because of >nullmove result. > >I tested the position with fritz 8, he solves it in 8 ply in nearly no time. >(PRODEO NEEDS 7 Ply, Ruffian 1.01 11 Ply). > >Are there non commercial engines that solves this position too in a short amount >of time? >Maybe the author of this engine would be so kind to explain the rule that solves >the nullmove-problem. > >Thanks Volker Ruy-Lopez solves it in depth 8, in under 30 seconds.
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