Computer Chess Club Archives




Subject: Re: What approach do you use to handle castling/en passant for repetition?

Author: Tom Kerrigan

Date: 06:17:48 02/28/00

Go up one level in this thread

On February 28, 2000 at 08:49:06, Robert Hyatt wrote:

>On February 28, 2000 at 03:25:09, Tom Kerrigan wrote:
>>On February 27, 2000 at 18:00:32, Robert Hyatt wrote:
>>>I don't believe this can be safely overlooked, because the wrong repetition
>>>value is a tiny part of a much bigger problem, that of not correctly hashing
>>>positions...  the former may not happen often.  The latter happens thousands
>>>of times every search.  Often enough that it will _definitely_ affect the
>>>root score enough to make a difference.
>>I would like to see some numbers to back up your argument.
>3, 47.5, 2.71828, 3.14159265358979323846264, and -.2
>All you have to do is run with and without EP hashed into your signature to

Exactly. I'd like you to do this [again]. And post some test suite scores
comparing the two, or something.

I know for a fact that some of the best programs don't hash this stuff, and they
don't seem to be hurting _nearly_ as much as you suggest.


This page took 0.01 seconds to execute

Last modified: Thu, 15 Apr 21 08:11:13 -0700

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