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Subject: Re: Chess IQ Test

Author: Volker Böhm

Date: 09:42:34 08/25/04

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Hi,

the following position of the iq - test (position 166) cannot be solved from
spike in reasonalbe time (> 2h):

r4r1k/6pp/3p3b/1p1Npb2/3nB2q/2N3P1/PP3P1P/R2Q1RK1 b - - 0 1

(The Move 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 (one move is not enough to show the mate thread thus going back
to window).

I tested the position with fritz 8, he solves it in 8 ply in nearly no time.
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

• Re: Chess IQ Test Brian Richardson 09:58:23 08/25/04
  • Re: Chess IQ Test Stuart Cracraft 20:51:50 08/25/04
    • Re: Chess IQ Test Brian Richardson 05:07:36 08/26/04
      • Re: Chess IQ Test Stuart Cracraft 14:00:33 08/26/04

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