Aryanmen

Revision as of 14:38, 1 August 2024 by Hordes (talk | contribs) (add note on 1233 and 7789, and formation note)

Aryanmen 「亜両面」 is a variation on the ryanmen waiting pattern. Appearing as a complete sequence with one extra tile on an end,[1] it can either be interpreted as "a ryanmen next to the hand's pair" or "a complete sequence with a tanki wait". Aryanmen is generally weaker than ryanmen, since 2 of the 8 winning tiles are in the hand, though it is better than tanki if a hand needs a pair.

Aryanmen
Kanji 亜両面
English Pair-attached open wait
Fu Pair dependent
Tile types waiting 2 sided wait
Tiles available 6 tiles
Pattern example

Tile pattern

              Waiting for:   

In this example, the underlying ryanmen wait is based on the 67m, but additionally, 567m can be viewed as a complete sequence, in which case the other 5m creates a pair wait.

Scoring

When aryanmen is won with the waiting tile not already present in hand, the wait can only be interpreted as a ryanmen wait, and it will score 0 fu.

When aryanmen is won with the waiting tile already present in hand, it can be interpreted as either a tanki or ryanmen wait. In this case, the highest-scoring option must be chosen. Normally, this will be the 2 fu for a tanki wait, but if the hand qualifies for the pinfu yaku, that will be scored instead.

Formation

If the hand currently lacks a pair, aryanmen is a relatively easy way to form a 2-sided wait. For each complete sequence you have, there will be 2 types of tile you can draw to form an aryanmen (and another 1-2 types that can form a nobetan). This can help with pinfu, which aryanmen counts for. However, aryanmen is weaker than ryanmen, since the tile acceptance is only 6 instead of 8.

Ryantan, kantan, and pentan can be formed in a similar way - by drawing an adjacent tile next to a triplet, you have a 2/3-sided wait for a pair.

Notes

  1. An extra tile on either end works, except for 1233 and 7789.

External Links

Aryanmen in Japanese Wikipedia