Author: Dieter Buerssner
Date: 12:59:25 06/15/03
Go up one level in this thread
On June 15, 2003 at 13:00:40, Harald Faber wrote:
>8/8/8/5k2/1pK4P/6P1/8/4b3 b - - 0 1
>
>Only 6 pieces and not far from the tablebases. But which programs find the
>winning idea? You see it when playing through because 1.Kg4 is found by
>programs. But which play the king manoeuvre and don't play stupid bishop moves?
In a small test vs. myself, Yace would win. It does not mean much of course. But
I think, it would win this vs. any opponent (it might insert some useless
moves). I am not good enough to judge longer PVs blind and did not check enough
of the PVs shown by analysis of the root positions. Also sometimes they are too
short or out of HTs (after all, typically chess engines are not optimized to
show long and reliable PVs).
But I can prove (needed perhaps 20 minutes) that with Kg4 black can announce a
mate in 24 (it could be a faster mate):
252678 0.967 Mat24 17t 1...Kg4 2. Kb3 Bd2H 3. Ka4H Bc3H 4. Kb3H Kf3H
5. Ka4H Ke3H 6. h5H Kd2H 7. Kb3H Kd3H 8. h6H
Kd4H 9. h7H Kc5H 10. g4H Bh8H 11. g5H Bd4H 12.
Ka4H Bg1H 13. h8=QH Be3H {HT}
Note that most moves are out of hash tables (the ones with H attached). Those
are not necessarily reliable (however the further up ones should be rather
reliable). The score must be reliable nevertheless.
Regards,
Dieter
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