Author: Vincent Diepeveen
Date: 06:35:52 08/28/00
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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
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