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Furiten: Difference between revisions
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[[Image:Furiten.png|right|thumb|250px|[http://tenhou.net/0/?log=2012110112gm-0009-7447-14ec5c8d&tw=0&ts=4 Baiman tenpai], in furiten due to 9-sou in discard. Ron cannot be called here.]] | [[Image:Furiten.png|right|thumb|250px|[http://tenhou.net/0/?log=2012110112gm-0009-7447-14ec5c8d&tw=0&ts=4 Baiman tenpai], in furiten due to 9-sou in discard. Ron cannot be called here.]] | ||
While a player's hand is in '''furiten''' {{kana|振聴}}, the player cannot declare a win on another player's [[ron|discard]] (i.e., they cannot [[ron]]). They are still allowed to win with their own draw ([[tsumo]]), assuming the hand is valid. | While a player's hand is in '''furiten''' {{kana|振聴}}, the player cannot declare a win on another player's [[ron|discard]] (i.e., they cannot [[ron]]). They are still allowed to win with their own draw ([[tsumo]]), assuming the hand is valid. | ||
The most common | The most common cause of furiten is with discards: if any tile a player's hand could have won off had been discarded before, it is furiten. A hand may also enter furiten when a player skips a win. | ||
This rule is often used for [[defense]] purposes to determine [[genbutsu|safe tiles]]: any tile a player discards is 100% safe against that player. | This rule is often used for [[defense]] purposes to determine [[genbutsu|safe tiles]]: any tile a player discards is 100% safe against that player. | ||
== Rule overview == | == Rule overview == | ||
While in furiten, the hand is unable to call ron upon a discard. However, it can still win via self-draw, assuming the hand has valid yaku. | |||
A hand in [[tenpai]] is in furiten in any of the following scenarios: | A hand in [[tenpai]] is in furiten in any of the following scenarios: | ||
* When at least one of the hand's current winning tiles have been discarded before, the hand enters furiten. A tile does not have to be in your discard pile to invoke furiten; if an opponent [[naki|called]] your discarded tile, | * When at least one of the hand's current winning tiles have been discarded before, the hand enters furiten. A tile does not have to be in your discard pile to invoke furiten; if an opponent [[naki|called]] your discarded tile, said tile will still trigger furiten. | ||
* After declaring [[riichi]], if the first winning tile is skipped, the hand permanently enters furiten. | * After declaring [[riichi]], if the first winning tile is skipped, the hand permanently enters furiten. | ||
* When not in riichi, when a winning tile is skipped, the hand enters temporary furiten. This furiten lasts until the player's next draw. | * When not in riichi, when a winning tile is skipped, the hand enters temporary furiten. This furiten lasts until the player's next draw. | ||
A "winning tile" is a tile that could complete the "4 groups + 1 pair" winning shape, even if the hand couldn't actually win because it would lack yaku. | A "winning tile" is a tile that could complete the "4 groups + 1 pair" winning shape, even if the hand couldn't actually win because it would lack yaku. | ||
Note: If a hand is in furiten, it is unable to win off ''any'' player's discard, regardless of which tile caused the furiten. 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. | Note: If a hand is in furiten, it is unable to win off ''any'' player's discard, regardless of which tile caused the furiten. 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. | ||
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You can tell what tiles a player discarded by looking at their discard pile, and looking at the rotated tiles in other players' tile calls. This leads to the most basic strategy to avoid dealing into a player's hand: tiles they have already discarded are guaranteed to be safe against a ron call from that player. | You can tell what tiles a player discarded by looking at their discard pile, and looking at the rotated tiles in other players' tile calls. This leads to the most basic strategy to avoid dealing into a player's hand: tiles they have already discarded are guaranteed to be safe against a ron call from that player. | ||
It is important to bear furiten in mind when developing a hand. Frequently, if a hand gets to tenpai and is furiten, | It is important to bear furiten in mind when developing a hand. Frequently, if a hand gets to tenpai and is furiten, the hand was inefficiently developed. This is not always the case, however, as a player can make a correct decision but still be in furiten. | ||
"[[Atozuke]]" - or when a player is in tenpai, but has no guaranteed yaku - is a common reason for furiten. In these cases, the hand will only gain yaku if it draws a certain winning tile. If a different winning tile is drawn, the hand will have no yaku, and is thus forced to discard its own winning tile - entering furiten. This most commonly occurs with: | |||
*A [[shanpon]] wait, with one tile completing a [[yakuhai]] triplet, and the other having no yaku. | *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]]. | *A [[ryanmen]] wait on 14 or 69 on a hand that would otherwise complete [[tanyao]]. | ||