Author: James Robertson
Date: 17:10:21 11/23/99
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On November 23, 1999 at 20:02:09, Jon Dart wrote: >In position #1, Crafty 16.16 switches from Qxh4 to Qh6 at 4 ply >in under 1 second. So does my program Arasan. The eval is around >-1.8, but Qxh4 is evaluated much worse. > >--Jon My program does the same, but later it chooses Qxh4 again because the threat it saw before was not real. It again switches back to Qh6 at ply 12, though. Do Arasan or Crafty do the same? James > >On November 23, 1999 at 16:04:49, Dan Andersson wrote: > >>These these positions appeared in my two latest 40moves/2hours games at the club >>championship. They are highly tactical in their nature. I have tested them on >>some programs and the evaluations of some of the programs are less than >>accurate. In the first position black felt forced to play Qxh4 is white winning, >>or is it merly a draw? Does your program play Qxh4? >>2br3r/p5k1/3b4/2pPp1pq/Pp2Q1PP/4NP2/1PB5/R2R2K1 b - - 0 1 >>In the second position the move is obvious, or not? >>r2q2k1/pp4b1/3np2r/3p1p2/3P1P2/2N1PBK1/PP5Q/2R4R w - - 0 1 >>Does your program find Qxh6 and in reasonable time and with a correct >>evaluation, better for white? The really interesting thing about the second >>position is that I spent half an hour four moves earlier and the sac. was made >>instantly. Doing the checking out of the combination in question early, I dont >>think any computers work that way. >> >>Regards Dan Andersson
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