Author: Robert Hyatt
Date: 09:54:42 09/03/99
Go up one level in this thread
On September 03, 1999 at 09:06:32, blass uri wrote:
>On September 03, 1999 at 08:43:24, Robert Hyatt wrote:
>
>>On September 03, 1999 at 06:56:52, Harald Faber wrote:
>>
>>>On September 01, 1999 at 23:58:35, Dave Gomboc wrote:
>>>
>>>>Ed used -0.75 so that it would act as a safety valve against humans (who
>>>>probably would have a tough time winning KBBKN.) It will be interesting to know
>>>>if he moves to tablebases for the next Rebel or stays without them.
>>>>
>>>>Dave
>>>
>>>Referring to his wwwboard he states he supposes an ELO gain of about 5 pts when
>>>using TBs so he will not implement TB access for Rebel10.5/RebelCP.
>>
>>
>>I believe it is higher than that against computers. Crafty played a 6 game
>>match with another computer last night (standard time controls) and two of them
>>ended up in won krp vs kr endings. I see that ending a _lot_ against computers.
>
>The question is if crafty could do the same result also without tablebases.
>
>The fact that crafty is using tablebases is not a proof that the tablebases
>helped practically and the only test is to repeat the same games against the
>same opponents without tablebases and to see the differences.
>
>Uri
Not quite. Two different questions:
(a) can crafty win won KRP vs KR endings?
(b) can it recognize which KRP vs KR endings are won and which are drawn
and only exchange into won ones?
(a) is hard... but I have some code that does reasonably well. But there are
some very sharp lines where the opposing king is within two files of the passed
pawn, and winning those can be very tricky. And at blitz time controls probably
nearly impossible to 'search'.
(b) is even harder, without tablebases. However, I have played a lot of games
vs computers that don't have tablebases, and I don't recall _ever_ losing a
krp vs kr ending vs them. Nor do I recall very many games where they were able
to draw the ending.
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.