Author: Alessandro Damiani
Date: 14:09:22 08/28/00
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On August 28, 2000 at 09:35:52, Vincent Diepeveen wrote: >On August 27, 2000 at 17:33:15, Tom King wrote: > >>Hi all, >> >>a question for programmers on fail highs. > >>what do you do in your program if a fail high is encountered, which on the >>research fails low? > >>I've ignored this issue, because it doesn't seem to happen all that often (in my >>program). So if my program finds a move which fails high, even if the research >>indicates that it maybe shouldn't have failed high, it thinks the move is good. >>Maybe this is bad? At the WMCCC recently, I noticed a couple of these fail high/ >>fail low moves cropping up at critical, complex positions. Often I was unhappy >>with the move my program chose in these cases. Perhaps these fail high/ fail low >>moves need to be treated with suspicion? > >Past few years i've experimented quite a lot with forward pruning in >DIEP. So historically i simply ignore a fail high anyway. I do some time >extension on fail highs. If they fail low afterwards they don't get >noticed anyway as i ONLY play the move which with an infinite window >for beta has given a PV. > >However in London i was very unhappy about the fact that many good moves >short after book failed high without having time to research them. >Good example is the Ng4? line against Francesca. Nd5 was failing high. > >>Cheers, >>Tom What about researching the fail-high move with the window (alpha, INFINITY)? Since alpha is the current best score you already have a best move, in case the fail-high move fails low after the research. Alessandro
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