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Subject: Re: WAC 8

Author: Peter Kappler

Date: 09:14:07 10/25/99

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On October 25, 1999 at 11:07:19, William Bryant wrote:

>On October 24, 1999 at 23:45:47, James Robertson wrote:
>
>>On October 24, 1999 at 22:54:00, William Bryant wrote:
>>
>>>On October 24, 1999 at 12:55:22, James Robertson wrote:
>>>
>>>>r4q1k/p2bR1rp/2p2Q1N/5p2/5p2/2P5/PP3PPP/R5K1 w - - bm Rf7; id WAC008;
>>>>
>>>>My program has always solved WAC 8 easily. But last night I noticed the latest
>>>>version chose Nf7+ instead of Rf7. I looked at the position with Crafty 16.18,
>>>>and it gives mate in 7 after Rf7. After Nf7+, Crafty gives mate in 10 on ply 12,
>>>>so this value may not be trustworthy.
>>>>
>>>>Can anyone look at the position and find out how far Nf7+ really is from mate?
>>>>
>>>>James
>>>
>>>
>>>Jumping on this thread late,
>>>
>>>James, mate positions in the hash table can be tricky.  My first problems were
>>>with the program never choosing the shortest path to mate. Bruce is an advocate
>>>of only storing bounds -not- distance to mate in the hash table.  Bob, just the
>>>opposite.
>>>
>>>If you were solving this before your latest 'change'.  See if the change affects
>>>your hash table and therefore starts leading you for a longer mate.
>>>
>>>William
>>>wbryant@ix.netcom.com
>>
>>I generally test WAC with 5 seconds per position. On my P233, nobody finds this
>>mate in that amount of time. :)
>>
>>James
>
>5s a positions.  That can make it quite a test.
>
>I just tested the latest Screamer at 1 minute per position.
>I am getting 264 positions in less than 10s (I will check to see how
>log I took to see position number 8 -- but it was less than 10 seconds).
>-284 positions is less than 30s
>-287 positions in less than 60s
>
>Thats a majority in less than a minute -- much better than before.
>
>Now I'm curious about how long I took to find #8, the "No One" gauntlett
>has been tossed :)))))  When I get home I'll look this up and let you know.
>
>William
>wbryant@ix.netcom.com


I think he was talking about seeing the mate in <5 seconds, not just finding the
right move.

--Peter



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