Author: Uri Blass
Date: 16:06:48 02/08/01
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On February 08, 2001 at 18:33:29, Torstein Hall wrote: >[D]3R4/3r1p1p/2pk4/5r2/6p1/6P1/P3RP1P/1K6 w - - 0 35 > >This position is from some blitz games played with Fritz 6 and Crafty 18.01 >Crafty won 15.5 - 10.5 but that is not the point. This is an important point because Bob said that crafty is not optimized for blitz so this result is surprising. I have some questions 1)Did you use the new Fritz6? 2)Did you use the same hardware for both programs? 3)Did you use machines with one processor or machines with more than one processor when Crafty is the only program that can use more than 1 processor? > >In this position Fritz 6 belives black to be a little better, even after a >rather long tink. Crafty 18.01 sees that 35.Rd2+ is a winninig move for white >because of the remote free pawn endgame resulting. (35...Rd5 36.Rxd7+ Kxd7 >37.RxR PxR and the rest is perhaps easy.) While Crafty 17.11 still want to play >Rd2+ but do not see it as winning. > >Is there some new knowledge about remote pawns in Crafty 18.01? I think that the knowledge is of Crafty17.14 There is a significant difference between the scores of 17.13 and 17.14 at depth 12(+1.27 against +0.28). Here is the relevant explanation from main.c of Crafty about Crafty17.14 another endgame evaluation problem fixed. the outside passed pawn code worked well, up until the point the pawn had to be given up to decoy the other side's king away from the remainder of the pawns. Crafty now understands the king being closer to the pawns than the enemy king, and therefore transitions from outside passer to won king-pawn ending much cleaner. Uri
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