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 BackgammonBackgammon and variants. Backgammon Links You are not allowed to post messages to this board. Minimum level of membership required for posting on this board is Brain Pawn. Mode: Everyone can post
16. September 2007, 07:44:22 Subject: Re: ratings tippyc:A proper ratings system would make adjustments which reflect the probability of the outcome. This in turn is a function of the relative strengths of the players and the length of the match. The longer the match, the greater the probability that the stronger player will win. Therefore, if the stronger player does win, the change in ratings should decrease with the length of the match. If the weaker (i.e. lower-rated) player wins, then the change in ratings should increase with the length of the match. 16. September 2007, 08:14:39 Subject: Re: ratings alanback: I made a request for something to fix this a while back. I thought my idea was good, but I guess not enough others did. Feature requests (Thad, 2007-07-15 06:55:25) 16. September 2007, 09:11:21 Subject: Re: ratings Thad: There are perfectly good backgammon ratings systems already available. FIBS and Dailygammon use the same formula, and it works great. 16. September 2007, 09:45:47 Subject: Re: ratings alanback: And most importantly, the FIBS formula is perfectly compatible with the BK formula. I told Fencer long ago that I was able to give him a formula that implemented the FIBS trick for taking into account the length of the match, while leaving the BK formula unchanged for single games. He seemed to be OK with the idea of changing the formula, but not willing to implement it any time soon. It is not a backgammon-specific problem. The current rating system could also be exploited by playing multi-games chess matches against weaker players. |
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