Author: Eric Oldre
Date: 20:03:59 07/21/04
Go up one level in this thread
On July 21, 2004 at 22:09:58, Robert Hyatt wrote: >On July 21, 2004 at 16:55:07, Eric Oldre wrote: > >>lets say you are searching a position with iterative deepening. >>at depths 3,4,5 it finds a best move of Qd3. then at depth 6 >>the best move changes to c4. >> >>When you start searching to depth 7, you clearly would want the >>first move you search to be c4, and this shouldn't be a problem >>if your transposition tables are working right. Since the best >>move should be stored in it. >> >>however, a good move to try 2nd would be Qd3, but your transposition >>tables aren't going to let you know that, at least not in the implementations >>that I have normally heard about. >> >>I was thinking that one way to overcome this would be to keep 2 "best" moves >>in the trans table. one to try first, and one that was a best move, before >>being replaced by a deeper search. >> >>Are other people doing this? or have you discovered that the cost is greater >>than the benefit? >> >>Eric > > >Nobody uses the transposition table to order the moves at ply=1. Well not quite, I do! Of course i hope to get that replaced in the future with something better. :) > Much easier is >to just generate the ply=1 move list before you start the search, and as you >find a new best move, move it to the top of the list, pushing others down 1 >slot. This makes you search the best move from the previous iteration first, >then the next-best move from the previous iteration second, etc...
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