Author: Dieter Buerssner
Date: 12:38:09 06/09/05
Go up one level in this thread
On June 08, 2005 at 16:37:51, Mihaly Szalai wrote:
>When will an engine understand that this is a draw?
Perhaps, it is not that difficulat at all. Using stale mate detection during
quiescence search may help a lot. And extending repeated checks aggresively.
With some interactive analysis (perhaps 1 1/2 hours) I get after 1. Ra2+:
8251385 11.266 0.00 19. 2.Ke3 Kf6 3.Kf3 Ra3+ 4.Kg2 Ra2+ 5.Kg1 Ra1+
6.Kh2 Ra2+ 7.Kh3 Kg5 8.Rg8+ Kxh5 9.a8=Q Ra7
11404414 13.109 0.00 20t 2.Ke3 Kf6 3.Kf3 Ra3+ 4.Kg2 Ra2+ 5.Kg1 Kg7 {HT}
14240831 14.691 0.00 20. 2.Ke3 Kf6 3.Kf3 Ra3+ 4.Kg2 Ra2+ 5.Kg1 Kg7
20652869 18.467 0.00 21t 2.Ke3 Kf6 3.Kf3 Ra3+ 4.Kg2 Ra2+ 5.Kg1 Kg7 {HT}
25269976 21.090 0.00 21. 2.Ke3 Kf6 3.Kf3 Ra3+ 4.Kg2 Ra2+ 5.Kg1 Kg7
36184173 27.550 0.00 22t 2.Ke3 Kf6 3.Kf3 Ra3+ 4.Kg2 Ra2+ 5.Kg1 Kg7 {HT}
The line may look stupid - black did not really try to win. Reason: at that
point the engine already "knew", that those "try to win lines" end in draw (as
everything else). So, the line shown is just some random line, because the
engine will not make a difference between hard to defend lines, and easy to
defend lines, when the theoretical result is the same.
After a8Q in the main line I showed some posts before (with the delaying move
Ra2, then your line) I actually got draw score rather fast (perhaps 5 minutes).
Then Yace decided to not promote the pawn with a score of 1.1 (That pawn on a7
looked too tasty). To get that score down to 0.0 took some effort.
Cheers,
Dieter
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