Author: Sune Fischer
Date: 17:25:56 04/20/04
Go up one level in this thread
On April 20, 2004 at 15:57:20, Pallav Nawani wrote: > >>So, Dr. Hyatt, what you're calling a LOWER flag is (I think) what I'm calling >>HashFlagBeta, and what you're calling UPPER, I call HashFlagAlpha, becuase those >>were the bounds that were exceeded. Personally, I hate this terminology...I wish >>we'd use more friendly terminology like AtLeastThisScore or LessThanThisScore. I >>think when I rewrite Trueno I'm going to do that, now that I understand >>alphabeta a little better. But that's neither here nor there...how does this >>look? Andrew > >This confused me a *lot* when I was programming my engine :-) I read beowulf's >code and I saw UPPER/LOWER. I read Bruce Moerland's page and I saw >HashBeta/HashAlpha. Only after much distress was I able to sort it out. > >But I could not figure out how hash entries could be use to avoid NULL move. >How do I do that? If you have reason to believe a null move will fail-low, for instance if (flag==UPPER && score<beta) do_null = "not recommended"; I use depth>=current depth. If I read the code correctly then Crafty uses depth>=current depth - R It seems theoreticly wrong, at least the way I do probes and stores. -S. >Pallav
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