Author: martin fierz
Date: 02:47:26 11/28/03
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On November 28, 2003 at 05:36:59, Uri Blass wrote: >On November 28, 2003 at 04:56:45, martin fierz wrote: > >>On November 28, 2003 at 01:21:16, Russell Reagan wrote: >> >>>I had this position in a game I played tonight. Analyzing it, I found that I >>>missed a draw. Ruffian took 9 seconds and 14 plies, while Crafty took 4 minutes >>>and 22 plies to see that it was a draw (Athlon 2GHz). Ruffian gives a draw score >>>after two repititions, so this might be why. I'm not sure what Crafty does. >>> >>>[D]8/8/8/1p6/8/8/pq3P2/3k2KQ w - - 0 76 >> >>i don't know why your crafty needs this long. my stupid engine sees the draw >>score after 1 minute on P4 2.4GHz at depth 15. > >This is the kind of positions that movei does not go deep and after equivalent >time I only start depth 9 and at depth 9 it cannot see draw score(at the time of >replying it is at depth 10 after more than 7 minutes on p850 and still no 0.00 >score). > >The reasons for the small depth may be that I do too much extensions and the >fact that I do not use hash tables for pruning(checks in the qsearch may be also >expensive in this position and I will need to check if this is not another >reason). i don't know what extensions you would be doing here that i'm not. i do a full ply on every check, which is more than many suggest. since this position is about giving lots of checks, you can imagine how many extensions i get :-) i do checks in QS too, but only on the first ply, and also only if i believe that i have an attack against the enemy king - so my program shouldn't be doing them here. this also looks like a position where a hashtable will make a HUGE difference - few pieces, no relevant pawn moves in the perpetual check line; so i suspect that this is the reason you're not going deeper here. >What is the level of your engine? weak ;-) >Do you test it in games against free winboard chess engines and if you do can >you mention engines of similiar strength? yes, i do of course, it's very frustrating :-) gothmog 0.3.1 and movei 0.799 are about similar in strength - i do nunn2 matches with blitz time controls (1 min + 5'' increment); i don't have an opening book (yet), so i can't play regular matches. cheers martin
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