Author: Sune Fischer
Date: 13:03:42 09/06/02
Go up one level in this thread
On September 06, 2002 at 15:46:53, Tony Werten wrote: >On September 06, 2002 at 14:45:11, Dann Corbit wrote: > >>Did anyone notice his cutoff idea in the evaluation function? >> >>It seems to me to be a very good idea, and I don't know if others have tried it >>out. >> >>Basically, it consists of three modes with two early exits... >> >>1. If the material + structure score alone is dominant enough, it exits right >>away. >>2. Otherwise, it processes the piece list. If that score is dominant, it exits. >>3. Otherwise, it does a full board control scan for all 64 squares. >> >>It is described starting on page 62 under the section "3.3.2 Multi Staged >>Design" >>He gets roughly 71% evals returning in stage #1, 13% in stage #2 and 7% in stage >>#3. >> >>It seems like it might be a big win to do it that way. > >It's called lazy eval and is not a good idea. The times it is wrong happen to be >the important ones. I think you can do it safely. If your positional score can't get higher than x, and your material score is already larger than beta+x, then what do you win by doing a full eval? This is how I use it now, of course I have simple eval, but even with a complicated one I would sum up the (few) big factors first and try the same. -S. >Tony
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