Daisangen

Daisangen
Type	Yakuman
Kanji	大三元
English	Big three dragons
Value	Yakuman
Speed	Slow
Difficulty	Hard

Daisangen 「大三元」 is a standard yakuman. This involves the collection of all three tile groups of the sangenpai (dragon tiles). It is one of the three yakuman gosanke 「役満御三家」, or "the three big families of yakuman".

Tile pattern

Agari:

Note: This hand is also winnable with

, but this hand would be shousangen instead.

Development

As the name implies, this yakuman depends on all three dragons. In the event where one dragon type is not available as a tiplet, then this yakuman is no longer possible.

Sekinin barai

Main article: Sekinin barai

The rule of sekinin barai applies to daisangen in the form of yakuman pao. This occurs when a player seeking to develop this yakuman already had made open calls (pon) with two out of the three possible dragon types. The rule is then invoked when the third type is discarded and called to complete the yakuman portion of the hand. So, the call upgrades the hand into a very obviously open daisangen. That third discarder becomes partially liable or fully liable for that play.