Riichi mahjong waits: ryanmen, kanchan, penchan, shanpon, tanki

Two-sided and closed waits

waits on either end, or : a ryanmen, the best basic wait. only waits on the middle tile: a kanchan. An edge like (only ) is a penchan.

Which tile completes this hand?

Two pairs

With two pairs, either can become a triplet while the other stays the pair: a shanpon. When all four sets are done, the last tile waits for its twin: a tanki.

Two pairs: tap every tile that wins.

Four in a row

Longer runs can be split more than one way. Try every split: each one gives waits.

Four in a row: tap every tile that wins.

Five in a row

A run of five waits on three tiles: both ends of each way to split it. A three-sided wait beats even a ryanmen.

Five in a row: tap every tile that wins.

Find them all

While you hold a tile, Riichi Arena shows the waits you would have after discarding it, and how many copies are left. Try this one without help.

Seven in a row: find every winning tile.