Furiten

While a player's hand is in furiten 「振聴 or 振り聴 or フリテン」, they cannot declare a win on another player's discard (i.e., they cannot ron). They are still allowed to win with their own draw (tsumo), assuming the hand is valid.

Baiman tenpai, in furiten due to 9-sou in discard. Ron cannot be called here.

The most common way to enter furiten is from discards: if a player had previously discarded a tile that their hand could now win with, their hand is considered furiten. Furiten is also caused when a player skips a win.

This rule is often used for defense: any tile a player discards is 100% safe against that player.

Rule overview

Furiten ron with a 5-sided wait in M.League invoking chombo.

While the hand is in furiten, the player is unable to call ron off any tile, but they can win by tsumo if the hand has valid yaku.

A hand in tenpai is in furiten in any of the following scenarios:

• When you have discarded at least one tile that the current hand could use to finish a "winning shape", the hand enters furiten until the wait is changed.
• After declaring riichi, if the first tile that could complete a "winning shape" is skipped, the hand permanently enters furiten.
• When not in riichi, when a tile that could complete a "winning shape" is skipped, the hand enters temporary furiten. This furiten lasts until your next discard.

The term "winning shape" includes the standard "4 groups + 1 pair" shape, as well as chiitoitsu and kokushi musou.

Note that it does not matter if the hand was unable to win with the discarded/skipped tile because the hand wouldn't have yaku. So long as the tile would complete a valid 14 tile shape, it counts for furiten.

Also note that, when in furiten, the hand is unable to win off any discard; the tile that "caused" furiten is irrelevant. For example, if your hand is waiting to win with 2p and 5p, and you had discarded 2p before, you are unable to win off an opponent's 5p.

A player declaring ron while in furiten is usually penalized with chombo, especially if the hand tiles are revealed.

Discard furiten

Discard furiten, the most common form of furiten, occurs when a player has previously discarded a tile that the hand could now win with. A hand can escape this type of furiten by changing its waits.

Because discard furiten exists, any tile a player has discarded is 100% safe against that player. Even if the player is waiting on that tile, they cannot ron (as they'd be in furiten).

It is important to bear furiten in mind when developing a hand. If a hand gets to tenpai and is furiten, it may have been inefficiently developed. This is not always the case, however, as a player can make a correct decision but still be in furiten.

A hand with no guaranteed yaku - a state known as atozuke - is particularly susceptible to furiten. When a hand is in atozuke, only some winning tiles would result in having a yaku. If a non-yaku winning tile is obtained, the hand is unable to win, and forced to enter discard furiten. Atozuke often occurs with:

• A shanpon wait, with one tile completing a yakuhai triplet, and the other having no yaku.
• A ryanmen wait on 14 or 69 on a hand that would otherwise complete tanyao.

Temporary furiten

Ron declined, so temporary furiten invoked until the next own's tile draw.

Calling a win is optional. If a non-riichi player does not ron a "winning tile" (even if a win cannot be declared due to lack of yaku), they enter temporary furiten until their next discard. Since it lasts for 1 turn, it is called temporary furiten.

Sometimes, a player may misinterpret their waits, entering furiten in the process. Alternatively, a player may be in atozuke and a non-yaku giving tile is discarded. Otherwise, a player may intentionally skip a win, entering temporary furiten in the process. This is mainly done after point standing analysis, such as:

• When a player is close to bankrupting, a player in 1st may want to target them in order to end the game faster.
• When close to all last, a player may need to ron a specific player to rise up in rank.

In a few rulesets, any tile call will cancel other players' temporary furiten.

Permanent furiten during riichi

Furiten riichi applied upon declaration and discard declining a winning hand.

Main article: Riichi

When a player has declared riichi, the state of temporary furiten does not expire. Therefore, if a riichi hand skips a win, it is no longer able to call ron. This is known as permanent furiten, or riichi furiten.

Since riichi is a yaku, there is no need to worry about a lack of yaku, unless under ryanhan shibari.

Reasoning

Furiten exists for two main reasons:

1. It helps players defend against other player's hands. Every tile that would cause furiten for a player is 100% safe against that player (see below for more details).

2. It makes it much harder to target other players.

• Because discard furiten exists, players cannot skip a tsumo win in order to ron another player.
• Because temporary and permanent furiten exist, players must take the first ron or enter some form of furiten.

Temporary furiten only lasts 1 turn as there's no way to prove a non-riichi hand was in tenpai, or was waiting on that tile, on the turn a tile is discarded. (Say furiten was permanent as soon as a hand reached tenpai. If a 5s was discarded the turn prior, 5s wouldn't be 100% safe on this turn, as an opponent could've reached tenpai between discards.) But as riichi announces the hand is tenpai and locks waits, riichi furiten is permanent.

Example

Example discard pile

2-pin in this discard applies furiten to the example hand

Waiting for:

This hand waits on three different tiles. If the player has a 2-pin in their discard pile, then the hand is in furiten and may not win by ron on any tile. Even if a 5-pin or 8-pin gets discarded by an opponent, ron may not be called.

Strategy

Defense

Main article: Defense

The furiten rule is essential for defensive play, as any tile that would invoke furiten to a player is 100% safe against that player:

• Discard furiten: Any tile that an opponent discarded is 100% against them.
• Permanent furiten: After an opponent declares riichi, any tile anyone discards is 100% safe against that riichi player.
• Temporary furiten: Any tile that the player to your left has discarded this turn is 100% safe against every player for this turn only.

Suji is a technique that is related to furiten. When a tile is suji, a hand cannot have a ryanmen wait (2-sided wait; the most common type of wait) for that tile without being in furiten.

Working with furiten

Sometimes, players may need to enter a furiten tenpai:

• The best discards in terms of tile efficiency can occasionally cause furiten (e.g., discard a lone 1-sou, draw a 3-sou then 2-sou.).
• When defending and developing the hand simultaneously, a furiten tenpai might occur.
• Rarely, a dama hand can intentionally choose to enter furiten. In this case, the hand is in tenpai, but after a winning tile is drawn, the player declares riichi instead of a win - immediately entering furiten. This is generally done to score a yaku like pinfu or sanshoku if the point situation demands a higher value hand.

Furiten only applies when a hand is in tenpai. Therefore, it is not terrible to keep a wait that could cause furiten later. If the wait is completed before tenpai, there is no downside.

Even if you do enter furiten, a 3-sided wait in furiten is still strong, and a 2-sided wait in furiten remains reasonable. When declaring riichi, a ryanmen furiten is about equal to a 1-sided regular wait; the ryanmen furiten is less likely to win, but scores more due to guaranteed menzen tsumo.

Exiting furiten

To exit discard furiten, you can change the hand's wait so that it can no longer win off any of the discarded tiles. For example:

Draw: Waiting for: (furiten)

If the hand had discarded previously, it would be in furiten. By drawing and discarding , it now waits on and . Thus, the hand is no longer waiting on , and is no longer in furiten.

External links

• 振聴

Furiten in Japanese Wikipedia