Author: Dieter Buerssner
Date: 07:47:03 02/13/01
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On February 13, 2001 at 02:02:37, Dann Corbit wrote:
>title position 100
Yace needs rather long for this. With more time, it will come up with b6+ or
with Be3, which both are winning. In the log you have shown, there was
Be3 in between, but for the wrong reason, because there was no b6 in the PV.
BTW. With this position, I get very bit changes in solution time for very small
changes for some null move strategies (dynamical null move or not, with little
material doing still rather aggressive null move. Do it only far away from the
root or not, etc.) I remember times between 8 seconds and 80 seconds on my
computer, and finding the solution between depth 15 and 20. Judging from the NPS
of the log, it looks a bit suspicios, that Yace did not find this within a
minute on your computer.
>title position 141
>solution Qxf4
>This one (WAC 141) was just a little slow. Took 14 seconds to find the right
>answer and 25 seconds to recognize a checkmate.
You are right. I am also wondering about this. There was allready the
explaination of null move. I also accidently found, that some small changes, to
when to do recapture extensions, can make Yace find this solution rather fast.
In recent versions, Yace will often find mates a bit slower than earlier
versions, because it won't try that hard to extend matethreats anamore, when the
position looks allread won. So, when an earlier version came up with a mate
score, now it may come up with a convincingly high score only, and delay the
mate score fro one or 2 plies.
>title position 163
>solution Qg2+
> 5291176 10.634 Mat11 10t 1...Qg2+ 2.Nxg2 hxg2+ 3.Kxg2 Bf3+ 4.Qxf3 exf3+
> 5.Kg1 Rf5 6.Rae1 Rfh5 7.Re8+ Kf7 8.Re7+ Kxe7
> 9.Re1+ Kf8 10.Re8+ Kxe8 11.d6 Rh1# {920}
>Just a bit slow on this one again. It took 9.5 seconds to find it and 10.5 to
>recognize checkmate.
Is 10 seconds bad, for a mate in 11? BTW. Here it is similar than with 141.
>title position 230
>solution Rb4
This one is unfortunately impossible for Yace :-(
>According to my reconing, Yace only missed one or two (depending upon how we are
>to interpret WAC 100).
It missed certainly 2. On my computer (AMD K6-2 475 with 20 M hash) I get
usually 296 with 10 seconds, with the 4 missing ones cited above.
Regards,
Dieter
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