Author: Don Dailey
Date: 11:53:03 12/30/97
Go up one level in this thread
>> >><small takes big>/<equal exchange>/<big takes small> >> >> >> >>ordering, but I see a *huge* explosion in my qsearch which is captures >>only (no checks). I regularly hit depths of 20+ not including plies in >>the regular search. First off, I'm wondering if the pros around here hit >>those depths in their qsearch? >> Hi again, After re-reading your post I think I see a problem with the move ordering you use for captures: <small takes big>/<equal exchange>/<big takes small> Try this: Always sort the biggest victim first and then in the order of smaller attacker. This may seem counter-intuitive but it's proven to be quite good. So QxR should get looked at even before PxB even though PxB is an upcapture. Even though upcaptures seem to be sure winners keep in mind that in a quies search lots of really silly positions arise. More often than not the rook in my example is completely undefended (often it just moved to some square or was involved in a capture itself and is undefended.) So you would rather capture a rook than a bishop wouldn't you? In the cases where the rook is defended the capture search will terminate very quickly anyway since the capture of the queen will be the very first move tried on the next level. -- Don
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.