Haitei raoyue and houtei raoyui: Difference between revisions

'''Haitei raoyue''' {{kana|海底撈月}} or simply '''Haitei''' is a standard [[yaku]], where a player wins with the tsumo on the '''haiteihai''', the last drawable tile from the live wall.  As such, this yaku is only accessible via tsumo.  

'''Houtei raoyui''' {{kana|河底撈魚}} is the ron variant to haitei, which is dependent on the last discarded tile of a hand. So, players making the last discard of the hand must take extra care not to play into another player's hand in this case.

The last tile draw and discard is defined by the [[dead wall]].  By rule, the dead wall must retain 14-tiles at all times; and this includes any revealed [[dora|dora indicators]].  Naturally, to score either haitei or houtei, a player must be at [[tenpai]] at the end of the hand just before [[ryuukyoku]].  Finally, hands may definitely be declared for a win, if either haitei or houtei is the only yaku of the hand.

'''Haiteihai''' {{kana|海底牌}} is the very last tile that can be drawn from the regular wall. This is clearly indicated as the 15th tile left, counting the tiles of the dead wall including the [[dora|dora indicator]]. Typically, this tile resides as the lower of two tiles next to the back end of the dead wall. Earlier calls for [[kan]] may "alter" the designation of the last tile, as that same bottom tile gets shifted into the dead wall to maintain fourteen tiles after the [[rinshan]] draw. In some groups, the tile may physically be moved from the live wall into the dead wall to make it clearer when the hand ends, but this generally not done in advanced play.

Likewise, the very last discard is called '''houteihai''' {{kana|河底牌}}, which is subject to the call of "ron" for the houtei raoyui yaku and nothing else.  [[Naki|Tile calls]] of chii, pon, or kan cannot apply to it.

If a player calls a kan when there is only one tile left in the live wall, the rinshanpai will be the last draw of the game. In this situation, the rinshanpai is not considered to be the haiteihai, and if the player calling kan wins off of that tile, it will be eligible only for the [[rinshan kaihou]] yaku and not for haitei. The final discarded tile is, however, considered to be the houteihai and is subject to the same rules as normal, including the prohibition on tile calls and the eligibility for the houtei yaku.

Haitei and houtei are mutually exclusive with each other, with [[chankan]], and with [[rinshan kaihou]]. Each of these yaku requires the winning tile to come from a different location (the live wall, a tile added to make a [[shouminkan]], and the dead wall, respectively).  Houtei cannot combine with [[mentsumo]] because it is only winnable via discards.

As for [[ippatsu]], it is impossible for the player calling riichi to have the last discard occur within one turn, because there must be at least 4 tiles left in the live wall when calling riichi. If an intervening call was made, which might mean that the player calling riichi would not get another draw, that call alone would disqualify an ippatsu. It is possible, however, for a player to call riichi with exactly four tiles left in the live wall and subsequently get both ippatsu and haitei on their next draw.