Author: Pete R.
Date: 16:03:25 08/04/99
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On August 04, 1999 at 14:57:02, José de Jesús García Ruvalcaba wrote: >On August 03, 1999 at 21:29:14, Pete R. wrote: > >>Currently in the Kasparov vs. The World correspondence game there are a number >>of endgames that involve races between passed pawns on either side of the board. >>While the programs have been quite useful so far, they aren't too swift in the >>transition to the endgame when passed pawns are the issue. Where a human player >>would push his passed pawn at every opportunity, the programs tend to diddle >>around moving pieces, until the pawn is almost promoted, when they suddenly >>realize that one side is winning. For example in the following position, >> >>8/1p1kp2Q/2np4/1p2bpB1/8/3q3P/5PP1/5RK1 w - - >> >>I ran Fritz 5.32, Hiarcs 7.32, and Crafty 16.12 for many hours, enough to get to >>18 ply for Fritz and Crafty. All of them recommend the move g4 for white >>(Crafty switches to g4 at 15+ ply), which gets buried by b4!. For example, >> >>27. g4 b4 >>28. Qxf5 Qxf5 >>29. gxf5 b3 >>30. Rb1 b2 >>31. Kf1 Na5 >> >>and by now they will realize that white is losing. There are a number of >>possible endgames coming up involving a race between white's passed h pawn and >>black's passed b pawn, and the programs have a real hard time with it. What's >>going on here? > > I recommend to use crafty 16.15 with 'extension pushpp 1.0' for this and >similar positions, it will extend more aggresively on passed pawn advances (the >default is 0.75), and will see the dangers at shallowers depths. > I can not do it myself because I do not have "many" hours of computer time >available. >José. Thanks, I'll play with these new parameters. I think the ppscale might be the one to use vs. the extension, but I'll have to fiddle with it.
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