Author: Fabien Letouzey

Date: 02:11:29 04/15/04

Go up one level in this thread

On April 14, 2004 at 13:33:38, Robert Hyatt wrote: >On April 14, 2004 at 03:30:22, Dann Corbit wrote: > >>I decided to toss an MTD(f) search into TSCP, and I've got something wrong, but >>I can't quite see what it is. > >There is a lot more to do. > >1. you need to modify the hash table to store 2 bounds, not 1. > >2. the search must be fail-soft. TSCP isn't. > >3. PV has to be yanked from the hash table and that makes it flakey at times as >has been discussed many times. There is another way to get the PV, but it is a >special case solution only for mtd... > >4. the convergence has to be accelerated. IE on a fail high searching v and >v+1 won't cut it. > >IE this is not a "drop in and go" it is a "rewrite and test" thing to do. :) > Could you give me a pointer on the special way to get the PV (not with hash tables)? I'm interested in the preconditions. I think 5) rounding the eval to the nearest multiple of whatever is also common. Maybe it's a very small gain but I think most MTD(f) engines do this, unless their eval has large grain to start with. Fabien.

- Re: Question for the MTD(f) experts
**Robert Hyatt***10:15:29 04/15/04*- Re: Question for the MTD(f) experts
**Fabien Letouzey***11:00:36 04/15/04*

- Re: Question for the MTD(f) experts

This page took 0.11 seconds to execute

Last modified: Thu, 07 Jul 11 08:48:38 -0700

Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.