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13:55, 26 March 2009
In a pure mathematical sense, your rating is essentially your overall winning percentage weighted by your opponents’ weighted winning percentages. It does not directly measure your word knowledge, board vision, time and rack management skills or other attributes required to be a good Scrabble player.
On the other hand, the object is to win the game. The better players will tend to wim win more games, and the ratings reflect that. Remember that Scrabble has a certain amount of inherent randomness, so in any given game, the lower rated player has a chance. And upsets do happen.
I hope this article gave you some insight into how the rating system works. I plan on publishing additional, more technical articles in the future. If there is something specific you would like to see documented, or have questions / comments, please feel free to drop me a note.