hand structure riichi

Toitoi

対々和

(トイトイ)

Definition

All triplets - a 2-han yaku where all four melds are triplets (pon or kan). Also called toitoihou.

刻子

Three identical tiles. Can be concealed (ankou) or open (minkou). Also called koutsu.

ポン

Calling another player's discard to complete a triplet. Can be called from any player out of turn. Opens your hand.

役

Scoring patterns or hands. You must have at least one yaku to win (except with riichi). Each yaku is worth a certain number of han.