Yakuman
Yakuman 「役満」 are a class of yaku (hand patterns), whose default point value is set at the maximum limit for a single hand pattern. Only a subclass of yakuman, kazoe yakuman, actually counts the number of han. The rest of the patterns are simply applied the point limit. This is due to the level of difficulty attaining the hands, due to low probability and low frequency.
Difficulty
A yakuman's value stems from its difficulty to form; and this difficulty is tied to its rarity as well as various limitations. These limitations impose some scarcity pertaining to specific tiles; or a limitation may impose a very specific condition, particularly for the likes of tenhou and chihou.
The other yaku impose their own specific limitations on tiles as well. However, their limitations offer a greater range of tiles to choose from. For example, both ryuuiisou and chinroutou are limited to just six tile types out of the available thirty-four.
Multiple yakuman
Some yakuman patterns may combine with each other. This is only because the tile patterns allow them to do so. The most common combination may involve tsuuiisou, which is able to combine with either daisangen or suushisou (wind based yakuman).
External links
- Yaku frequency among Tenhou.net players (Japanese)
- Lists all the yaku occurrences in Tenhou.net by percentages and by room
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