Author: Dieter Buerssner
Date: 08:23:26 12/19/00
Go up one level in this thread
On December 19, 2000 at 04:30:31, Harald Faber wrote:
> [Deleted] 8/6KP/2r1k3/8/p7/P7/1P5P/8 b - - 0 0
>
>Test your progs with and without TBs. Which prog needs how long to see that this
>is not a draw but black wins?
The current version of Yace chooses Rc7+ from the first ply and never changes.
For some time, it show draw score, and fails high after 16 seconds with a score
> 2.0 (and has 3...Rh8 in the PV) After 5 1/2 minutes, it shows the following PV
60742253 275.4 2.73 22t : 1...Rc7+ 2.Kg6 Rc8 3.Kg7 Rh8 4.Kg6 Ke7 5.Kg7 Ke8
6.Kg6 Kf8 7.h3 Ke8 8.Kg7 Ke7 9.h4 Ke8 10.Kg6H
Kf8H 11.h5H Ke7H 12.Kg7H {HT}
Which I think is until the first forced pawn push 7. h3 identical with the
line analyzed by Vincent. (White moves 2. Kg6 3. Kg7 instead of Kg8 Kg7 in
Vincent's line, but I think this is essentially identical). This is also true of
the Crafty analysis posted by Dann.
If I follow the line, the score rises first slowly, but at some time the pawn
captures will be seen. But it is a very long line. Only for blacks 7th move I
get a score > 3, for the 8th move a score of 4 (all the way following the line
Vincent has shown). Those scores are for a time of about one minute.
I think, many chess engines will win this, independent of the score shown.
Perhaps, also a good position, to test the hash tables, and for programs, that
still use null move with only one rook on the board, also to test the null move.
Regards,
Dieter
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