Ryanmen

Ryanmen (両面)

Ryanmen is a double-sided wait pattern in mahjong, considered the strongest and most efficient waiting configuration. It occurs when you need to complete a sequence by drawing either of two different ranks, with eight tiles available to win.

Detailed Explanation

Ryanmen literally translates to “both sides” in Japanese, accurately describing how this wait functions. When you have two consecutive numbers in a sequence—such as 4-5 of the same suit—you can win by drawing either the 3 or the 6, completing either the 3-4-5 or 4-5-6 sequence respectively.

Why Ryanmen is Superior

Ryanmen is universally recognized as the optimal wait pattern because it offers the highest probability of winning. Since eight different tiles can complete your hand (four copies of the 3 and four copies of the 6 in a standard game), you have the maximum number of outs among all wait types. This statistical advantage makes ryanmen waits the target for skilled players during hand development.

Comparison with Other Waits

Unlike ryanmen, other wait patterns offer fewer winning tiles:

• Kanchan (middle wait) occurs with non-consecutive numbers like 3-5, waiting only on the 4, providing just four tiles
• Penchan (edge wait) happens at sequence boundaries like 1-2 or 8-9, waiting on only one rank and offering four tiles
• Tanki (single wait) requires a specific tile, offering only four copies

The superiority of ryanmen becomes especially apparent in competitive play, where probability directly influences winning rates.

Development Strategy

Players actively work toward ryanmen waits during hand development. When choosing which tiles to discard early in a round, experienced players prioritize creating potential ryanmen patterns over other wait types. This strategic focus on ryanmen waits is fundamental to efficient mahjong play and separates casual players from competitive ones.

Usage Example

Consider this hand development scenario:

You hold 3-4 of bamboo tiles and are considering your discards. This 3-4 combination has ryanmen potential—you can win by drawing either 2 bamboo or 5 bamboo, giving you eight possible winning tiles total. As the round progresses and you draw additional tiles, maintaining this ryanmen wait while working toward other combinations becomes a priority.

Later in the hand, if you draw a 5 bamboo, your ryanmen wait becomes stronger. You now have 3-4-5 completed and might develop new ryanmen waits with other tiles in your hand, such as 6-7, which waits on 5 or 8.

Conversely, if you draw the 2 bamboo early, you complete the 2-3-4 sequence and must develop ryanmen patterns from your remaining tiles. This demonstrates how ryanmen waits constantly shift and evolve throughout a hand.

Related Terms

Kanchan: A middle wait offering only four winning tiles, significantly weaker than ryanmen. Also called a “inside wait.”

Penchan: An edge wait at sequence boundaries, offering the fewest tiles among standard waits. The weakest two-tile wait pattern.

Pinfu: A specific hand pattern that typically relies on ryanmen waits as part of its structure, making ryanmen integral to achieving this yaku.

Iishanten: A hand state one step away from ready, often involving the development of ryanmen waits as the hand progresses toward completion.

Agari: The winning condition in mahjong. Ryanmen waits are the most likely to achieve agari due to their eight available tiles.

Understanding ryanmen is essential for mahjong mastery, as it represents the mathematical foundation of optimal hand strategy and probability management throughout a round.