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Subject: IQ-Test Position 166, any hint how to solve it ?

Author: Volker Böhm

Date: 09:52:46 08/25/04


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 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

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