Author: Robert Hyatt
Date: 20:53:33 11/25/98
Go up one level in this thread
On November 25, 1998 at 18:32:27, Jon Dart wrote: >In a recent game, my program (White) reached this position: > >5b2/5P2/p7/5P2/P7/2k5/8/1K6/ w > >White is a pawn down and the passer is firmly blocked. A >little search will reveal that White is going to lose the >advanced pawns. But I am curious about Crafty's eval here >(this is crafty 15.18): > >White(1): setboard >White(1): score >end-game phase > clearing hash tables >note: scores are for the white side >material evaluation................. -1.00 >development......................... 0.00 >pawn evaluation..................... 0.55 >passed pawn evaluation.............. -0.10 >passed pawn race evaluation......... 0.00 >interactive piece evaluation........ -1.40 >total evaluation.................... -1.95 >White(1): execution complete. > >I don't really see how the passed pawn eval >gets to be negative, or where the "interactive >piece evaluation" gets to be -1.40. Clearly >Crafty realizes statically that White is in >trouble here, but I'm having difficulty looking >at the source and seeing what eval terms are >kicking in. > "negative" is relative. The above is from white's perspective, so this means that the passed pawn is good for black and not white... the "interactive piece evaluation" is damned near impossible to understand, because it includes too many components that can get multiplied together. That could include king safety, open files, weak pawns, all sorts of stuff. One quick thing to do if you can compile the source, add "-DDEBUGEV" to the cc options.. then do the sc (but do *not* let it search or you will get a zillion lines of output) and get more detailed info broken down by each piece type... >Also, I'd be interested to see what score other >programs give here. > >--Jon current crafty says this: note: scores are for the white side material evaluation................. -1.00 development......................... 0.00 pawn evaluation..................... 0.24 passed pawn evaluation.............. 0.18 passed pawn race evaluation......... 0.00 interactive piece evaluation........ -0.92 total evaluation.................... -1.50
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