Author: Ernst Walet
Date: 14:23:18 02/09/00
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On February 09, 2000 at 11:46:35, Ernst Walet wrote: >On February 08, 2000 at 10:19:06, Stefan Meyer-Kahlen wrote: > >>On February 07, 2000 at 16:10:55, Ernst Walet wrote: >> >>>I´ve seen some strange evaluation glitch in Shredder 4 with the following >>>position. >>> >>>8/1K6/8/5k2/bR1P1r2/1n6/8/8 w - - >>> >>>Shredder wants to play Rxa4, score ply 9-14 about -1.2 >>> >>>Make the move. >>> >>>Shredder wants to play Nxd4, score ply 9-14 about +4.71 >>> >>>Make the move. >>> >>>Shredder wants to play Ra8, score ply 9-14 about -1.3 >>> >>> >>>Why such a different score after the first move? Does Shredder much >>>preprocessing? >>> >>>Ernst-J. >> >> >>Thanks for your interesting post! >> > > >You´re welcome. > > >>First of all, Shredder's evaluation is always from the point of view >>of the moving side, so there is "only" a difference of 3.5 pawns and not >>5 pawns :-) >> > > >I know, nevertheless.... > > >>This is a special case for which I added code after Jakarta 96, where Shredder >>almost blew a game against Virtual Chess. >> >>I, like many other programmers, evaluate a KRN-KR ending very drawish. In your > > >You´re right, this game ended as draw. > > >>second example, I simple deactived that code so Shredder as black this time will >>go for the last white pawn. If the code were still active, Shredder would never >>capture the pawn, because KRN-KRP would be better than KRN-KR. I agree that >>there are other ways to solve that issue, but I haven't touched that code for >>quite a while now and almost forgot that this is still in there. >> >>I agree that this is very brute force, but that method proved to be very >>succesful in chess :-) >> >>Hope this helps >> Stefan > >Thanks for your reply, Stephan. > >Ernst-J. I´m sorry, not Stephan but Stefan of course!
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