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Subject: Re: Wrong position Mate in 32

Author: Johan de Koning

Date: 15:34:36 05/05/04

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On May 04, 2004 at 18:25:19, John Merlino wrote:

>On May 04, 2004 at 17:58:25, Dieter Buerssner wrote:

>>PS. Luckily CM cannot beat this for principle reasons :-) (AFAIK)
>
>You're correct. By my testing, The King cannot announce a mate in >22. Perhaps
>the next version in CMX000 will increase this boundary.

Yes, CMX's engine will have a limit of 62 ply, allowing upto +-Mate31.

My current version however can still not see M31 and M30 in this position.

[after some debugging]
Some critical positions transpose to earlier lines,
in which they happened to be too close to the hard limit,
hence are stored as only +4.65 or something.

A pathological case that I call perpetual transpositions.
It also happens often in endgames with repetitional draws.
No easy fix available, I think. :-(

... Johan



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