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16. Settembre 2007, 07:44:22

alanback

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Argomento: 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. Settembre 2007, 08:14:39

Thad

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Argomento: 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. Settembre 2007, 09:11:21

alanback

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Argomento: Re: ratings

Thad: There are perfectly good backgammon ratings systems already available. FIBS and Dailygammon use the same formula, and it works great.

16. Settembre 2007, 09:45:47

nabla

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Argomento: 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.