Author: Stuart Cracraft
Date: 13:12:53 09/20/04
Go up one level in this thread
Excellent explanation. Thanks. On September 20, 2004 at 04:07:40, martin fierz wrote: >On September 19, 2004 at 23:58:28, Stuart Cracraft wrote: > >>I use null move only to return the null move search >>value if >= beta, otherwise fall through to everything else >> >>But I hear that one can use the null to adjust alpha. >> >>When I try to adjust alpha this way: >> >> nullmovestuff >> alpha = MAX(alpha,nullmovescore); >> >>my results drop precipitously. >> >>Perhaps my method is wrong or adjusting alpha has fallen >>out of favor. >> >>Comments anyone? >> >>Stuart > >as michael said, you normally do the nullmove search with a minimal window, i.e. >any score you get will be a bound and therefore useless. >i expect that you could use an infinite window and use the returned exact value >to adjust alpha if it is larger than alpha. but i'd be very surprised if that >helped overall! >the reason is that most of the time in your search, the search windows will be >very small anyway, and it will be very unlikely that you can adjust alpha based >on this technique. > >cheers > martin
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