Full flush 清一色 · chinitsu

The entire hand is one suit — the highest-value regular yaku in the game.

The opportunity announces itself early: a starting hand with seven or eight tiles of one suit is the classic signal to commit. The plan from there is blunt — keep your suit, let the other two suits and the honors go. Your hand will look broken for a few turns, which is why this works better as a decision than a drift. If stubborn honor pairs refuse to leave, dropping back to a half flush still pays well.

The famous trap is the wait. Thirteen tiles of one suit hide waits on three, four, or more tile types, and misreading them is how players end up furiten フリテン without noticing — see how furiten works. Before you declare riichi, walk through the hand one tile type at a time and list every tile that completes it. Slow is fine. Wrong is expensive.

Inside a single suit, chinitsu stacks with whatever fits: a pure straight, tanyao if you stay off the 1s and 9s, riichi if the hand stays closed. Each extra han moves real points at this height — check the score table to see the jumps. The classic tension is speed against value: calling makes the hand arrive sooner but drops the chinitsu yaku itself to 5 han (dora and open-compatible yaku still add on top), and your one-suit discards told the table to fold long ago.

Key points

• Open it is a mangan on its own; closed it is already a haneman — and dora or any second yaku push toward baiman
• The waits get famously complicated: nine-tile suits hide multi-tile waits that even veterans misread
• Like honitsu, it telegraphs through your discards — expect everyone to fold

Related yaku

• Half flush 混一色 — The whole hand uses a single suit plus honor tiles.
• Nine gates 九蓮宝燈 — 1112345678999 in a single suit plus one more tile of that suit — closed only.
• Pure straight 一気通貫 — The sequences 1-2-3, 4-5-6, and 7-8-9 in one suit — a straight through the whole suit.

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