Author: Odd Gunnar Malin
Date: 11:21:50 02/03/02
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On February 03, 2002 at 13:32:42, William H Rogers wrote: >Here is an item from Chess Skill in Man and Machine >One of the first programs written for computers and later turned into Deep Blue >well, I least I think that it lead to Deep Blue. >The ran a series of 300 games, playing the program against itself with only >different ply settings to see the difference in playing strength. >Here are the results: > > Rate P4 P5 P6 P7 P8 P9 >P4 1235 -- 5.0 .5 0 0 >P5 1570 15 -- 3.5 3.0 .5 0 >P6 1826 19.5 16.5 --- 4.0 1.5 1.5 >P7 2031 20 17 16 --- 5.0 4.0 >P8 2208 20 19.5 18.5 15.0 --- 5.5 >P9 2328 20 20 18.5 16.0 14.5 --- > >As you can see in the lower ply numbers the program gained the most strenght, >but as the ply level got higher the rating increase became smaller and smaller. >It would be nice to see some math on a curve to estimate the over all effects. >Bill P5-P4 15.0-5.0 ... P9-P8 14.5-5.5 Not convincing, but the number of games seems small 20 game each. I think I recognize this table as the Belle test from 1983 I have only the number with one ply difference but these numbers are the same. There was a new selfplay test by Heinz (ICGA June 2001) with Fritz 6 and 3000 games each: P6-P5 2143.5 - 856,5 P7-P6 2176.0 - 824.0 P8-P7 2063.0 - 937.0 P9-P8 2050.5 - 949.5 P10-P9 1977.5 - 1022.5 P11-P10 1886.5 - 1113.5 P12-P11 1855.0 - 1145.0 The difference when increasing the ply was primary from more drawn games. Odd Gunnar
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