Rinshan Kaihou (After a Kan)

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.

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.

Winning within one go-around after declaring riichi, before any call or kan interrupts the turn. Closed-only by virtue of requiring riichi, and one of the cheapest ways to add a free han to a riichi hand — it stacks freely with everything else riichi unlocks.

A hand made of four triplets (or kans) and a pair — no sequences. Often built from middle-game pon calls; pairs naturally with sanankou (three concealed triplets) and yakuhai for high-han open hands.

A hand containing three concealed (un-called) triplets, regardless of the remaining structure. 2 han, open or closed — the call rule applies to the other meld and the pair, not to the three concealed triplets. One more concealed triplet upgrades the hand to suuankou yakuman.