Author: Howard Exner
Date: 10:57:44 11/25/98
Go up one level in this thread
On November 24, 1998 at 19:01:17, Bruce Moreland wrote: > >On November 24, 1998 at 15:07:28, Howard Exner wrote: > >>2B5/k7/8/K7/4B3/8/8/8 w - - id drawend1; 2n5/kP6/8/K7/4B3/8/8/8 w - - id Pos 3 - JOUNI.EPD; I should mention that this two bishop draw was taken from Jouni Uski's endgame suite. Here Rebel10 plays the correct promotion to the Knight in default mode but when I set Rebel's play style to agressive it promoted instead to a bishop - yikes! It may not be all that practical to know this but I believe it should be included so as to avoid what might be an embarrassing moment in a game or in endgame analysis. >>8/1Q6/8/8/8/8/p4K2/k7 w - - id drawend2; >>8/2Q5/8/8/8/6K1/2p5/2k5 b - - id drawend3; >>5nrb/2q2Pn1/6pk/8/6K1/8/8/8 w - - id drawend4: >>8/8/8/7p/6kp/4b3/7K/8 w - - id drawend5; >>8/8/8/8/3b4/p2k4/P7/1K6 b - - id drawend6; >>8/8/8/3k4/4q3/5R2/6P1/6K1 b - - id drawend7; >>8/4k3/6K1/8/4N1N1/8/8/8 w - - id drawend8; >> >>Do programs know that these 8 positions are drawn? >>How important is it it to include this specific >>endgame knowledge? - From both programmer and consumer >>perspective. >> >>I think most programs will know the draw with KNN vs K >>or the rook pawn with the wrong colored bishop. > >That's a good set. The hardest ones are the Q vs P endings, meaning that the >knowledge is hardest to codify in those. I don't think you can just say "return >0" in those cases because there are some that are won. However, they are easily >solved with tables. In regards to tables is there such a thing as a reduced endgame base with just the most common scenarios? Or are the efficient to a point where there is no performance hit during actual play? > >The KBP vs KP is also a nice trick. You can move the ram a file to the right >and that's another good one, I'll have to remember that one, I wasn't aware of that draw. >which actually cost mine a half-point once in a >slower game against an IM. Not anymore. I believe it is a good thing for chess programs to add endgame knowledge even when the probability is rare of the position showing up. I think it makes for a more complete product.
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