Computer Chess Club Archives


Search

Terms

Messages

Subject: Re: Node count explosion

Author: Tony Werten

Date: 00:22:39 09/05/05

Go up one level in this thread


On September 03, 2005 at 15:41:48, Mridul Muralidharan wrote:

>[D]r2q3r/1b1k1pbp/p4np1/2BP1pN1/p1B5/P1Q5/1PP3PP/R3K2R w KQ - 0 19
>
>My engine royally blows up when it comes to this position (arrived at a game
>against some engine a long while ago).
>I suspected excessive extensions , qsearch problems , eval inconsistencies ,
>bugs , etc.
>Could not find any bugs and there were no obvious others problems ... the
>position just kills the node count.
>Analysed it with other engines and most if not all had similar problems.
>
>I have not done an actual position analysis of the position with a strong player
>(that is tactics , positional aspects , etc - just analysed the stats that my
>engine dumps for this pos).
>
>Any comments ?

It seems check related. Altough XiniX doesn't explode, it doesn't get very deep
either.

5% of all moves give a checkextension, 5% off all checks give a single reply
extension.

Effective branching factor stays below 3 however and first fail high stays above
95%

Tony

>
>Thanks,
>Mridul



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.