Author: Dan Honeycutt
Date: 21:16:55 09/12/04
Go up one level in this thread
On September 12, 2004 at 14:22:08, Scott Gasch wrote: [snip] >I tried this with mixed results. Overall my ECM/20 score dropped. Now I am >thinking about what is wrong with this idea. For one, I use PVS so doing >anything based on alpha in the search could cause problems. Imagine searching >some line with a=b-1, deciding to extend based on that alpha, finding something >great, researching with a real a..b window, deciding not to extend based on the >new alpha, and missing the "greatness". > I don't understand what "new alpha" you are talking about. I do the scout search with a window of alpha, alpha + 1. If the search fails I research with alpha, beta. If it's a reduction (which I expected to fail low but didn't) I research with normal depth. If it's an extension I leave depth alone - hoping to find that "greatness". Dan H.
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