Author: blass uri
Date: 23:04:43 07/29/98
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On July 30, 1998 at 00:48:21, Shaun Graham wrote: > How are computer chess program ratings calculated, what is the formula? >It has occurred to me that perhaps it makes no sense to calculate computer >ratings in the way that human ratings are calculated. It's hard to describe my >point so i will give an example. > >A human rated 2200(base rating) plays a tournament of ten games, after the >tournament his rating is calculated to be 2280. Arriving at this calculation >his initial rating of 2200 was used. In his next tournament of ten games his >rating is calculated to be 2320. To arrive at this rating 2280 was used in the >base calculation. This seems to work for humans because you can hypothesize >improvement thus a new base rating works, but for computers it seems as if >having a new base rating may be problematic because their is no so called >"improvement". In a way it seems to me that it all works fine and I know the >rating is supposed to just measure performance but i just have an intuitive feel >that there should be a difference in the calculations. > >Another problem that i have is that say i have 50 tourney games played, and i >calculate the rating in ten game increments. I use the new rating achieved >after each ten as the base to do my calculation. my final rating is different >than if i acted as if all the games happened in one tournament. Perhaps i'm >screwing the calculation? > > >I have hypothesized that to calculate the rating of a program based upon all the >games played at once you should use the provisional formula > >For example Chessmaster 5555 on Kai Luebke's web page >"http://www.geocities.com/TimesSquare/Ring/8448/chessindex2.html" in 40/2 games I looked at the games and I do not understand why Junior4.6 as white was never out of book in its game against and did a draw. The game was: 1.e4 c6 2.Nc3 d5 3.d4 exd4 4.Nxe4 Bf5 5.Ng3 Bg6 6.Nf3 Nd7 7.h4 h6 8.h5 Bh7 9.Bd3 Bxd3 10.Qxd3 Qc7 11.Rh4 e6 12.Bf4 Qa5+ 13.Bd2 Qc7 14.Bf4 Qa5+ 15.Bd2 Qc7 16.Bf4 Junior4.6 as an annotator of a game between Nimzo98 and Fritz5.01: "White has lost his nerve... understandable when you consider his position" 2 mistakes: 1)White is a computer program so it has no nerves 2)should be its position and not his Is the shuvinist "his" a word of Junior4.6 or maybe a word of Fritz5(using Junior4.6 as an engine for it)? Uri >has won 29 games, drawn 13, lost 11 games. I gave a flat rating of 2400 to all >opponents > >the calculation went as follows [(29wins * 2400)+(29wins*400)] + [(13draws * 0)+ >(13draws * 2400)] + [(11Loss * 2400)-(11Loss * 400)] = 2535(Chessmaster is a >MONSTER) > >This is the standard uscf formula of adding 400 points to opponents ratings for >wins, and subtracting 400 for losses, then dividing by the number of games >played for a provisional rating. > >The opponents were Rebel9 & 8, Mchess 7, Fritz 5, Hiarcs 4 & 6, crafty 14.8, >Junior 4.6, and Genius 5.
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