Author: Harald Faber
Date: 21:57:16 06/15/03
Go up one level in this thread
On June 15, 2003 at 15:59:25, Dieter Buerssner wrote:
>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
Did you notice that in this line the idea with the king is OK but that white
gets a queen with 13.h8-Q and black cannot capture this piece?
Maybe you should play through this line, I am sure Yace will find the right
moves then too, because up to move 9 everything is fine.
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