Author: scott farrell
Date: 16:37:51 01/12/04
Go up one level in this thread
On January 12, 2004 at 12:04:52, Anthony Cozzie wrote: >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. > I've recently come to a similar conclusion. I currently ripped a few extensions out, and reduced some to half plies, and implementation of SE (my own version), lead to greater full width searches, but with still plenty of more controlled SE extensions, to I ended up with the best of everything, similar on test positions, much much better in games. >anthony
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