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1

Speculation is all well and good, but I wanted data. I selected an OTB quick tournament from February and compared final scores with initial quick and regular ratings. After removing any previously unrated players, (surprisingly, everyone who previously had a regular rating also previously had a quick rating) the scatterplots looked like this: The regular ...


0

Starting new players at 1200 will distort the ratings and make it take longer , with a LOT more games played in total, for the ratings to settle down to anything near accurate. You should first have a big tournament where most all local players play a lot of rounds. Swiss would work best if you have more players than you could have enough rounds for a RR. ...


3

The Universal Rating System is an alternate rating system which, according to the project's web site: The Universal Rating System™ (URS™ for short), is a revolutionary new sport’s rating system designed to assess the relative strength of participants across a wide variety of competitor vs competitor sports or games. The URS™ was developed as the result of a ...


1

Rating floors make it non-zero sum as other have pointed out. Many years ago, I was talking to a major tournament organizer who supported this. I think one reason (in chess) that they did not want people to be able to lose a lot of rating points was cheating by losing in cheap events and then playing in big-money events against much weaker players. This ...


2

In addition to the other answers: it would depend on the organization running the Elo system as to whether there are additional modifiers. e.g. back when I was playing chess, the Chess Federation of Canada awarded "participation points" basically points just for playing. Obviously not zero-sum. The North American Scrabble Player's Association ...


12

Are Elo ratings a zero-sum system in chess? No, they are not zero sum. There are two reasons for this. First of all, when a player first gets a rating then that is a pure plus. There is no corresponding minus. The player gains a rating of 1000+ (the lower bound of the rating system) by virtue of wins and draws against rated players. Since the player was ...


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Between most players, Elo ratings are zero-sum. The formula for updating an Elo rating looks like this. Suppose player 1 and player 2 are playing a game. First, their ratings are used to generate a prediction: an expected score W that player 1 will get against player 2. Then, we compare this to the actual score, X. player 1 will get K*(X-W) points, where K ...


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