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Explanation of the NSA Rating

Members of the North American SCRABBLE® Players Association (NASPA) 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 Boston SCRABBLE® Club employs a rating system which assigns numbers in the range 0 to 1. 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 how each player performs against each of the other club members; this performance is measured by wins only and not scores.

The NSA rating is an indication of how a player performs in tournaments. The 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 slightly different statistics. TO-BE-CONTINUED