Tap the side that won the rally. It keeps rally scoring to 21 (win by 2, capped at 30), works out who serves from which service court in singles and doubles, and calls the interval at 11 and every change of ends.
Scoring and serving rules are summarised from the documents above. Undo is unlimited, so a mis-tap is never a problem.
Every rally scores a point. A game is won by the first side to 21 with a two-point lead; at 29–all the side that wins the 30th point wins the game. A match is best of three games.
From the right service court when the serving side’s score is even, and the left when it is odd. In doubles, only the serving side changes courts — the server and partner swap each time they win a point; the receiving side stays put.
There is an interval when the leading side reaches 11 points in a game, and an interval between games. Players change ends at the end of each game, and in the deciding game when the leading side reaches 11.
The side that won the previous game.
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