Computer Chess Club Archives


Search

Terms

Messages

Subject: Re: Fine #70 and hash bug(s) (warning: long post)

Author: Dan Honeycutt

Date: 12:21:22 04/19/04

Go up one level in this thread


On April 19, 2004 at 13:01:25, Andrew Wagner wrote:

>On April 19, 2004 at 11:48:46, Dan Honeycutt wrote:
>
>>Hi Andrew:
>>Misery loves company.  Bruja's output looks just about like Trueno's and it
>>insists that Kb2 is the move.  I tried the position with Crafty and Pepito and
>>both lock on to Kb1! almost immediately.  Like you I'm 99.9 percent sure my keys
>>are good and I've also tried a larger table to no avail.  I think Martin in the
>>post below is right - we're doing something wrong with the way we store or use
>>the bounds.  In the source code of Pepito in the file hash.c i found a #ifdef
>>DEBUG_HASHING in the hash store routine.  Soon as I have time i'm going to try
>>this.  Looks like what he does with the debug code is make a probe when he does
>>a store and check for consistency.  If you look at the code it will help to know
>>a little Spanish:
>>
>>Deberia ser = what (the values) should be
>>Sin embargo = what, however, they are
>>prof = depth
>>tipo = type/flag
>>
>>Good luck.  Let me know what you find and I'll do the same.
>>Dan H.
>
>Hi Dan. Well, at least I don't feel _quite_ as dumb then, knowing someone else
>has the same problem. Did you base your code on Pepito's? Do you know where I
>might possibly get a copy of it? I speak some spanish, so it would be
>interesting to see anyway. See my post above for how I handle bounds. Andrew

Hi Andrew:
Pepito you can find at:

http://www.winboardengines.de/pepito/

Pepito uses a two-part table with different replacement schemes which appears
very similar to what Crafty does.  I use a more simple single table based on
what Bruce Moreland gives on his site:

http://www.seanet.com/~brucemo/topics/topics.htm

I figured by keeping it simple it would be more likely to work :(
I saw your post above.  I'm at work (yes, my priorities are screwed up) and will
look to see what I do when I get home.

Dan H.



This page took 0 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.