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Members of the North American SCRABBLE® Players Association (NASPA) or formerly the National SCRABBLE® Association (NSA) who play in sanctioned tournaments establish a national rating which is a number in the range of about 200-2200. The value of the number has no intrinsic meaning, but it should be viewed as a number relative to other rated players. This form of rating is similar to that used in Chess.
The Lexington SCRABBLE® Club employs a rating system which assigns numbers in about the same range. These two rating systems are not related. The club system is an indication of how a player performs at the club only. It is based on the percentage of points a player gets in each game along with the rating of the opponent.
The NASPA/NSA rating is an indication of how a player performs in tournaments. The NASPA/NSA rating is based on win-loss records of an individual in comparison to the average ratings of that individual's opponents in the tournament.
So these two rating systems are measuring different statistics. T0-BE_CONTINUED SOMEDAY MAYBE