Gyakuten

Discarded winning tile may not be enough for gyakuten.

Gyakuten 「逆転」 is an instance, where a player had passed up the placement of another player during the last hand. Players can either "luck" their way for a last minute win (or improvement in placement); or, they can know the points table. The latter can produce an advantage by having a better idea on the needed tile composition as well as other key decision making options, especially riichi.