Author: Michel Langeveld
Date: 08:07:08 08/26/00
Go up one level in this thread
On August 26, 2000 at 10:42:05, pavel wrote: >On August 26, 2000 at 09:21:15, Robert Hyatt wrote: > >>On August 26, 2000 at 09:16:50, Uri Blass wrote: >> >>>I tried this position from the game century3-crafty17.11 >>> >>>[D]rnbqk2r/pp1p1ppp/4pn2/4P3/1b1N4/2N5/PPP2PPP/R1BQKB1R b KQkq - 0 1 >>> >>>Crafty17.13 played 6...Qc7 >>> >>>I gave my Crafty17.11 as engine for Hiarcs with 128 Mbyes hash time control of 4 >>>hours/60 moves >>>(I guess that this time control is similiar to 2 hours/60 moves on the alpha) >>> >>>My Crafty17.11 changed its mind in the last second at depth 12 from 6..Qc7(0.15 >>>pawn advantage) to the better move 6...Nd5(0.16 pawns advantage). >>> >>>I am interested to know crafty17.13's opinion. >>>Can crafty17.13 avoid 6...Qc7 at depth 12? >>> >>>Uri >> >> >>It avoids it by depth=10. The problem was that the mode we were using forced it >>to play Qc7 as it was a book move. Somehow we followed a very rarely played >>line, but until I get the log files from Graham I can't tell exactly why. I >>did notice a pretty significant CAP score that might have pulled it down that >>line erroneously... > > >do you think adding the CAP score to crafty was a bad decision? >or 'in other words' do you think it could have played better without them? > >thanks >pavel I posted before a message that Crafty has to get a better implementation of CAP data, without telling how, here's my opinion: 1) The CAP-data has to be searched deeper OR the data must get minimaxed. I think the last one is the best. 2) Crafty has to trust more on CAP scores. Now it only it only says scores < x is wrong and scores > y is a good move. This can be very wrong when crafty is behind -1.5. It then denies all positions... (This is also a problem in wild5 because white is ahead +3.0 from the first move). But if point one is done, crafty CAN trust more on CAP scores. 3) Crafty has to use the CAP scores immediatly during BOOK generation. Since importing all rows AFTER book generation goes wrong for positions like 1. d4 g6. (This is a problem I discusted with bob before). Ofcourse I'm open to discust some points in further detail if someone wants to.. Kind regards Michel
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