What is furiten in mahjong?

Furiten means one of your winning tiles is in your own discard pile, so you cannot win on a discard (ron) — you can still win by self-draw (tsumo).

Is furiten permanent?

Only if you discarded the tile while already tenpai. If you were not tenpai, the furiten is temporary and clears when your hand changes shape.

Can you be furiten without discarding a winning tile?

Yes — passing on another player's discard that would have won the hand puts you in furiten until your next draw.

Furiten in Riichi Mahjong: The Rule Every Player Gets Wrong

What furiten is, why it exists, temporary vs permanent furiten, self-draw furiten, and how to avoid it.

Published 2026-07-30 · Updated 2026-08-13

Furiten in Riichi Mahjong: The Rule Every Player Gets Wrong

What does furiten mean?

Furiten (振听) is the riichi rule that blocks you from winning on a discard. If any tile that would complete your hand is already in your own discard pile (including tiles your discards were called away with), you may not declare ron; you can still win by self-draw (tsumo). The rule exists to stop a cheap exploit: without it, a player could discard a tile and then immediately win with the same tile from the next player, which would destroy the discard discipline the whole game is built on. On this site the check is enforced by the scoring engine: the furiten flag invalidates any ron attempt, and the UI shows a "Furiten" badge whenever your current waits include a tile you have already thrown. The check applies whether the tile is still visible or not (what matters is that your own discard pile contains a tile you could win on).

What is the difference between temporary and permanent furiten?

The distinction between temporary and permanent furiten decides how much trouble you are actually in. If your hand was already tenpai when you made the offending discard, you are in permanent furiten for the rest of that hand (no change of waits can clear it). If you discarded the tile before reaching tenpai, the furiten is temporary: it clears automatically once your hand changes to a tenpai shape that no longer waits on a discarded tile. In practice temporary furiten is the common case, because hands evolve (you threw a 3 dot early and later your hand shifted to wait on 3 dot). The badge on this site reflects exactly that: it appears only while a discarded tile is among your current waits, and it disappears the moment your waits no longer include one. Knowing which kind you are in changes your plan: permanent furiten means your only realistic path is tsumo or a defensive draw, while temporary furiten rewards a quick reshape.

What is self-draw furiten?

Self-draw furiten is the rule everyone misses. You can be furiten without ever discarding a winning tile: if another player discards a tile that would have completed your hand and you decline it (whether because you wanted a bigger hand or simply did not notice), you are locked out of ron until your next draw. This is the most expensive way to enter furiten because it costs you nothing until the moment it bites: for the rest of the round, every discard that would have won is a hand you may not take. On this site the game never auto-passes for you; a win call is always presented as an option, so the decision (and the furiten consequence) stays yours, exactly as the official rules intend. The rule is deliberately harsh because passing on a win is a choice, not an accident; the game treats every opportunity as information and punishes players who reject it without good reason.

How do you avoid furiten?

Avoiding furiten is a one-step habit: before every discard, scan your waiting tiles against your discard pile. If you are tenpai and one of your waits is already in your pile, you have three real options. Switch to a different wait if the hand allows it; declare riichi anyway, accepting that your locked hand is tsumo-only; or simply stay tenpai and rely on self-draw, which furiten never blocks. The deeper habit is to avoid throwing tiles you are likely to need later in the first place (tile-efficiency players rarely create furiten because they rarely throw useful tiles). When you must throw one, at least know the consequence before the tile leaves your hand. The check also covers tiles called away from you: a discard another player pon'ed or chi'ed still counts as yours, so a hand waiting on it is locked out of ron exactly as if the tile sat in your own pile.

What misconceptions are worth clearing up?

Three misconceptions cause most of the damage. First, furiten does not stop you from winning by tsumo (self-draw is always available, which is why furiten players often pivot to drawing their own win). Second, on this site furiten is checked for concealed tenpai hands; open (melded) hands skip the check, because the MVP follows the simple rule that riichi itself requires a concealed hand. Third, furiten is not a penalty (you keep playing and winning normally; only ron is blocked). Knowing furiten well is a genuinely free edge: many casual players either lose hands they could have taken or, worse, try to declare ron illegally and get their win rejected. Players who internalize the rule never face either outcome. The mental model that eliminates all three errors at once is simple: furiten answers one question ("could I win on any of my own discards?"), and if the answer is yes, only a draw can save you.

How does furiten interact with called-away tiles and riichi?

Furiten interacts with two details that change real games. Called-away tiles count: a tile you discarded that another player pon'ed or chi'ed is still "your discard" for furiten purposes (the test suite on this site explicitly verifies that called-away waits block ron). And furiten shapes riichi decisions: declaring riichi does not clear existing furiten, so a furiten player who declares riichi is declaring a tsumo-only hand with a locked shape; conversely, riichi is itself a reason to double-check your pile first, since a locked hand cannot escape furiten by changing waits. The cleanest mental model is that furiten tracks your discard pile against your waits at every moment (nothing erases it except changing waits in the temporary case or the hand ending in the permanent one). When in doubt, the safest play is a discard you have never thrown before, because a fresh tile cannot add new furiten conditions to your hand.

Sources & references

FAQ

What is furiten in mahjong?: Furiten means one of your winning tiles is in your own discard pile, so you cannot win on a discard (ron) — you can still win by self-draw (tsumo).
Is furiten permanent?: Only if you discarded the tile while already tenpai. If you were not tenpai, the furiten is temporary and clears when your hand changes shape.
Can you be furiten without discarding a winning tile?: Yes — passing on another player's discard that would have won the hand puts you in furiten until your next draw.