ranked rules
Same board.
Three minutes.
Trace adjacent tiles without reusing a tile. Ranked words need at least four letters.
scoring
4 letters1 point
5 letters2 points
6 letters3 points
7 letters5 points
8+ letters11 points
shared words
A word found by both players scores zero for both. Only the words your opponent missed count.
rating
Everyone starts at 1200 Elo with a K-factor of 32. Expected results move ratings slightly; upsets move them sharply. Every gain is offset by the opponent's equal loss.