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Subject: Re: A move to search 2nd... Keep in the trans table?

Author: Eric Oldre

Date: 20:14:45 07/21/04

Go up one level in this thread

On July 21, 2004 at 17:51:44, Ed Trice wrote:

>I think crafty keeps either two killer moves or two history heurstic moves to
>try, I forget which. It has been a while since I looked at that code, but I am
>sure Dr. Hyatt would know the answer right away.
>The benefit is found in the move ordering, which can reduce the tree size if
>implemented properly. Usually your first strong move gives you the greatest
>benefit in terms of the cutoffs, but having a second one around just in case
>will help get you very close to the theoretical minmal skeleton tree size
>possible with alpha-beta.

I just got a basic SEE routine implemented last night. I couldn't believe what a
huge difference it made in my move ordering over the MVV/LVA i was using before.

I'm hoping that once i get killers, a history heuristic, and the 2 tier trans
table, that it improves greater still.

that won't come for a while though, my eval function needs some attention!!!

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