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Subject: Re: Mate in 22....Engine test....etc.

Author: Dieter Buerssner

Date: 15:35:30 05/04/04

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On May 04, 2004 at 10:39:12, Tord Romstad wrote:

>Not really.  The only thing you test with this kind of artificial position is
>whether the engine has checks in the qsearch.

Perhaps, perhaps not only. Yace does not use checks in qsearch (at least not by
default) and will find it. But needs longer, 30 seconds. I have until now only
tried checks in first level qsearch (not in remaining levels). I tested soem
variations - like using check in qsearch only when directly coming form null
move, always, and few more. I never saw a significant difference (besides in
test positions, some are solved many plies earlier with checking moves in the
first call to qsearch). I always handle checking moves that capture in first
qsearch level somewhat more careful.

What I wanted to say - just extending many checking moves in a row aggressively
should help to solve such a position. No special qsearch will be needed then. No
doubt, checks in qsearch will also help.

Cheers,
Dieter




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