Author: Volker Böhm
Date: 10:41:18 08/25/04
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On August 25, 2004 at 13:06:40, Álvaro Begué wrote: >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. Do you know if Ruy-Lopez has a special rule to skip nullmove-prunings in such a position? Greetings Volker
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