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How to improve backgammon: Adopt a world ranking system like tennis or golf

Posted By: Rich Munitz
Date: Wednesday, 6 July 2011, at 2:35 a.m.

In Response To: How to improve backgammon: Adopt a world ranking system like tennis or golf (Ken Larsen)

providing that there is a sliding scale that places more weight on the more recent data and less on the older stuff. But, that could get tedious to program.

An Elo rating system has exactly this property for highly active players. But it fails to reward money round victories and it fails to penalize inactivity.

A Master Points system recognizes winning, but does not decay with the passage of time.

However, it is easy to conceive of a rating system based upon lifetime Master Points records where there is a time decay factor added.

For example, the Master Points earned at each event in the player's lifetime is multipled by DecayRate^(# years since date earned), for some appropriate value 0 < DecayRate < 1. DecayRate ~= 0.75 seems best to me for backgammon (due to the volatility and the greater length of time needed for some consistency to emerge via tournament results, I don't think backgammon results should decay nearly as quickly as in tennis and golf).

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