Author: Stuart Cracraft
Date: 09:31:13 08/15/04
Go up one level in this thread
On August 15, 2004 at 11:58:28, Uri Blass wrote: >On August 15, 2004 at 11:31:11, Stuart Cracraft wrote: > >>On August 15, 2004 at 10:42:46, Dan Honeycutt wrote: >> >>>On August 15, 2004 at 10:25:43, Stuart Cracraft wrote: >>> >>>>So what makes a program more aggressive? >>>> >>>>Better king safety? >>>> >>>>Points for control or occupation of square near the enemy king? >>>> >>>>I've tried obvious things and never been satisfied with the >>>>aggression-level. >>> >>>Asymmetrical king safety. Program needs to not mind moving a piece which >>>shelters it's own king to a position that menaces the enemy king. >>> >>>Dan H. >> >>My current king safety is very limited but doesn't involve any >>hardwiring of friendly pieces to my king. They are free to roam. >>At the same time, I've noticed no aggressive tendancy. It plays >>passively and reaction-only to what the opponent with few exceptions. >>On the other hand, it really fights for the center, develops quickly >>and castles on a timely basis. But once the middlegame hits, nothing >>much happens except wood-shuffling. >> >>I do have a tropism factor to get queens, rooks, and knights to >>minimize the distance to the enemy king. Perhaps something is wrong >>with them. I don't use attack tables in evaluation since my program >>has none. I'll have to revamp the whole program some day to add >>them incrementally but haven't found a good paradigm yet Even bitboard. >>I liked the thing that Atkin/Slate did with incremental updates >>in their makemove/unmakemove. >> >>So basically "middlegame" malaise is my program's problem. I need >>to tighten the tropism to just the few squares around the enemy >>king and heighten the bonus. There is already a substantial bonus >>for loosening pawns protecting the king but I need to get some >>heavy firepower over there, sans attack tables, using tropism >>to get something real happening. >> >>I wish there were some test suites that gauged early midle-game >>aggression. Not checkmate/mate type things but simply threats against >>the castled king. >> >>Stuart > >I think that based on your WAC results search and not evaluation is the main >problem of your program. > >You should get easily more than 290/300 in a few seconds if your search work >correctly. > >Uri Uri, I wish. It's a Pentium 3 1ghz. Not very fast by today's standards. Also, I can only run with 500,000 hash table entries. If my search is broken, it will be years before I find the bugs through trial-and-error. Also, my results just went up after improving the evaluation only. Stuart
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