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

Author: Tord Romstad

Date: 08:13:55 07/22/04

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On July 22, 2004 at 10:39:41, Robert Hyatt wrote:

>I'll ask again.  _how_ can you use the transposition table to order moves at the
>root position?  That is a single position.  How many "best" moves can you store
>in a single transposition position and how do you sort them to figure out which
>is best, second best, third best, etc...

For the first move, I use the transposition table (of course).  For the
remaining root moves, I use exactly the same techniques as in internal nodes
(captures ordered by SEE values, history heuristic, and so on).  I am sure it
is not optimal, but I also doubt that I would notice any big improvement if I
changed this.

>You don't have to have a separate search for ply=1 if you don't want to, while
>still treating ply 1 differently as I do...

Yes, as mentioned elsewhere in the thread, I could also add lots of
if(Ply==0) ... statements to my search function.  Because my code is already
unacceptably complicated and messy, I don't want to do this.  My new program
is a different story, I will probably try ordering the moves differently at
the root there.

Tord




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