Author: Anthony Cozzie
Date: 09:04:52 01/12/04
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On January 12, 2004 at 08:19:58, Tord Romstad wrote: >On January 12, 2004 at 07:59:23, Anthony Cozzie wrote: > >>On January 12, 2004 at 05:37:48, Tord Romstad wrote: >> >>>FEN, please? >>> >>>Tord >> >>[D]r6r/k4pp1/pq2p2p/1p1n4/3N3P/1R6/PPP1QPP1/2KR4 w - - 25 > >Thanks! > >>One of the reasons I like this position is that Crafty needs some minutes to >>come up with the solution. Gothmog should have no trouble: this position is >>very sensitive to checks in qsearch. If you do recapture extensions you will >>find it even earlier. . . . > >Actually, Gothmog doesn't find it that easily. It needs longer time (but >much fewer nodes) than Zappa to find Nxb5+. The right move is found after >10 plies, 13 seconds and 2.4 million nodes on a PIV 2.4 GHz. > >I don't do checks everywhere in the qsearch, but only at nodes where the >engine guesses that it is necessary. This is of course not an easy guess >to make, and it doesn't work perfectly. The main factors influencing the >decision are the material left on the board, the king safety evaluation, >the tactical complexity of the position, the static eval for the node, >and the upper and lower bounds for the root score. > >Recapture extensions are not used at all in Gothmog. I've tried them >many times, but they never worked for me. > >Tord Zappa is not a tactical monster. Back when I had 1-rep and recap, it was pretty decent, but I'm more or less following Fritz/Crafty in my approach: limit the extensions, get a lot of brute force depth, and outsearch in the middlegame. anthony
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