All Scrabble players know that Q and Z are the highest scoring tiles. You can get 10 points for each, in the English language version of the game. But according to one American researcher, Z really only deserves six points.
Not all letters change under these proposals but those that do tend to have fallen in value. In explaining why his overall point distribution is lower, Lewis blames Q which, as he puts it, is an "outlier", much harder to play than other letters.