Ryanmen
| Kanji | 両面 |
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| English | Open wait |
| Fu | 0 fu |
| Tile types waiting | 2 sided wait |
| Tiles available | 8 tiles |
| Pattern example |
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| Tenhou.net example | Using riichi |
Ryanmen 「両面」 is the most commonly occurring wait pattern in the game. Commonly referred as the "open wait", this pattern involves two consecutively numbered tiles, waiting on the "outside" number. For example, a 3-4 needs either a 2 or a 5 in order to form tile groups of either 2-3-4 or 3-4-5. By far, this is the most efficient wait pattern, as it uses just two tiles while waiting on a maximum of eight possible tiles.
Pattern
Waiting for: 
or 
Always, ryanmen wait for two tiles. In addition, two ryanmen patterns may combine to form a ryanmenten, which waits for 3 tiles instead of two.
Fu
Due to its relatively ease, the ryanmen pattern is not awarded any fu. The inability to gain fu based on ryanmen makes it an essential component to the yaku, pinfu.
Pinfu
The yaku, pinfu, requires ryanmen, because the waiting pattern does not produce fu. Ryanmenten is also allowed, as nested ryanmen do not produce fu either.
Suji
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Ryanmen is directly related to suji, or the mahjong intervals. At any time, ryanmen waits on a pair based on the three intervals of: 1-4-7, 2-5-8, and 3-6-9.
Waiting for: 
or 
In this example, the consecutive 2-3 needs either of the two waiting tiles in order to complete the sequence. The 1 and 4 is included in the 1-4-7 interval.
External links
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