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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.]] | ||
'''Furiten''' {{kana|振聴}} is a restriction applied to | '''Furiten''' {{kana|振聴}} is a restriction applied to [[tenpai]] hands. While in furiten, the player loses the ability to declare a win on a player's [[ron|discard]] (ron). Any hand in a tenpai state has a set of possible tile(s) for winning. Primarily, the hand is marked as furiten, if any tile in that set is in the player's own discard. This includes any [[Naki|called tiles]]. Other cases involving riichi and temporary furiten are also applicable. Regardless, the hand can still win by [[tsumo|self-draw]] (tsumo) given valid [[yaku]]. | ||
This rule is often used for [[defense]] purpose to determine [[Genbutsu|safe tiles]]. Tiles with the furiten rule can infer via [[suji]] and [[kabe]]. Though this may not be guaranteed barring the shape of player hands. | |||
== Rule statement == | == Rule statement == | ||
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While in furiten, the hand is unable to call ron upon a discard. However, it is still winnable via self-draw, assuming the hand has valid yaku. | While in furiten, the hand is unable to call ron upon a discard. However, it is still winnable via self-draw, assuming the hand has valid yaku. | ||
=== | === Common case === | ||
{{Discard pile | {{Discard pile | ||
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}} | }} | ||
The most common case of furiten involves a player's own discard. If a winning tile is in a player's discard, then the hand is in furiten. | |||
All of a player's discards can be checked at any time during play, by looking at their discard pools and 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 safe against a ron call from that player. | All of a player's discards can be checked at any time during play, by looking at their discard pools and 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 safe against a ron call from that player. | ||
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Sometimes, it may be necessary to deliberately place the hand in furiten. Often, this is the result of developing the hand and defending simultaneously. To escape the bind applied by furiten, then the hand's [[machi|tile wait(s)]] must simply change by adjusting and changing the tiles in the hand with subsequent tile draws. Of course, a player may place greater expectation on tsumo to win rather than ron. | Sometimes, it may be necessary to deliberately place the hand in furiten. Often, this is the result of developing the hand and defending simultaneously. To escape the bind applied by furiten, then the hand's [[machi|tile wait(s)]] must simply change by adjusting and changing the tiles in the hand with subsequent tile draws. Of course, a player may place greater expectation on tsumo to win rather than ron. | ||
On rare occasions, a player may hold a tenpai hand with [[damaten]]. The hand may invoke [[riichi]], but the player had chosen not to for some reason. Eventually, a winning tile may arrive; and instead of declaring a win, the player opts to call riichi. That instantly puts the hand in furiten opting to win by tsumo later. | |||
=== Furiten tsumo === | === Furiten tsumo === | ||