Ryantan

Ryantan
Kanji	リャンタン; ペンタン
Fu	Dependent
Tile types waiting	3 or 2 sided wait
Tiles available	11 tiles
Pattern example	;

Ryantan 「リャンタン」 and pentan 「ペンタン」 are combination waits, which involve a triplet and an adjacently appended numbered tile. The tile combinations for both appear identical. However, pentan involves terminals, where as ryantan does not.

Ryantan is a combination of ryanmen and tanki. It involves a triplet from 2-8 and an adjacent tile that is also from 2-8. The terminals are excluded for this combination. For example, with a 2223 ryantan, the wait can be seen as either a pair and ryanmen (22 + 23), or a triplet and tanki (222 + 3), for a wait of 1-4 and 3.

Pentan is a combination of penchan and tanki. The converse of ryantan, it can occur in two ways. The triplet can be composed of terminals, or the adjacent tile can be a terminal.

In order to reach tenpai with ryantan or pentan, no other pairs must be in your hand. In other words, these should be considered as waits to complete the pair. If you already have a "stable" pair (i.e. a pair that cannot be used for other shapes), these patterns should be seen as a triplet and an extra floating tile.