Author: John Merlino
Date: 18:40:20 04/08/02
Go up one level in this thread
On April 08, 2002 at 18:49:22, Andrew Williams wrote: >On April 08, 2002 at 16:47:19, Russell Reagan wrote: > >>On April 08, 2002 at 16:12:54, Jeff White wrote: >> >>>33.cxd5 Qxc5 >>>-+ (-10.77) Depth: 2/5 00:00:00 >>>33.Qxd5 cxd5 >>>-+ (-10.41) Depth: 2/5 00:00:00 >>>33.Rxb7 >>>-+ (-10.01) Depth: 2/5 00:00:00 >>>33.Rxb7 Qf5+ 34.Kg2 Rxc5 35.Rxb8+ >>>-+ (-9.58) Depth: 2/5 00:00:00 >>>33.Rxb7 Qf5+ 34.g4 Rd3+ 35.Kg2 Qxc5 36.Rxb8+ >>>-+ (-9.73) Depth: 3/7 00:00:00 >>>33.Rxb7 Qf5+ 34.g4 Rd3+ 35.Kh4 Qxc5 36.Rxb8+ >>>-+ (-9.75) Depth: 4/11 00:00:00 >>> >>>The above evaluation is something that I just cut and pasted from a game that >>>Crafty evaluated. These are BASICALLY the same on all computer programs. What I >>>need to know is what these figures mean. Am I right in assuming that -10.77 >>>would mean the program sees the position better for black? If it was a +10.77 it >>>would be better for white? What does the number mean? The "10.77"? What about >>>depth 2/5? I am also assuming that 00:00:00 would mean the time the program >>>looked at the position? ANY help is greatly appreciated. Thanks very much. >>> >>>Regards, >>>Jeff >> >>You are correct in assuming that negative values are good for black, and >>positive values are good for white. Most computer programs (in fact, all that >>I've ever seen) give the value in terms of pawns. So if the score is -10.77, >>that means that black is ahead by about 10 or 11 pawns. You can also use the >>rough piece values of queen=9, bishop and knight=3, pawns=1, rooks=5 if you want >>a general estimate. >> > >The point about negative being good for black isn't universal. For my program >(and I think some others) a positive score is good for the side whose turn it >is. So if it's Black's turn and the score is -10.77 in my program that would >mean that White is winning by about a Queen. > >I agree with the rest of what Russell said. > >Andrew > This is true, and one of the potentially most confusing engines would be The King (the engine in Chessmaster). The Chessmaster GUI uses positive for White and negative for Black in all cases. But the eval scores that The King sends to the CM GUI are just like Andrew describes (positive in favor of the side to move) and the GUI does the translation for consistency purposes. jm
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