Riichi Mahjong Trainer

The same numerical sequence in all three numbered suits (e.g., 234m / 234p / 234s). 2 han closed, 1 han open. Often paired with pinfu or tanyao, and structurally exclusive with ittsu — pick one or the other based on whether your early draws cluster vertically or spread horizontally.

Winning by ron on the very last discard of the round. Companion to haitei (the equivalent last-tile self-draw). Easy to overlook — always recheck waits as the wall empties.

Yakuman. A closed flush of the form 1-1-1-2-3-4-5-6-7-8-9-9-9 in a single suit, plus any one of 1-9 of that suit. Mathematically a chinitsu by construction. The 9-way wait (junsei chuuren) pays double yakuman in stricter rulesets.

Two identical sequences (e.g. two 234m) in the same suit, in a closed hand. 1 han, closed-only — any call kills it outright. Replaced by ryanpeikou (3 han) when the hand contains two such pairs of identical sequences.

A closed hand of all sequences, with a non-yakuhai pair and a two-sided (ryanmen) wait. Adds zero fu beyond the base — pinfu tsumo stays at 20 fu, pinfu ron rounds to 30. The high-frequency partner of riichi and tanyao in closed-attack templates.

Winning by self-draw on the very last tile drawn from the wall. Companion to houtei (the equivalent last-discard ron). Always check waits before the final draw.