This is a special yaku applied to closed tenpai hands, which requires the player to make a declaration and 'wager'.

Any player who draws a winning tile with a closed hand is awarded this yaku. One han closed only Menzenchin tsumohou 「門前清自摸和」 Win by self-draw Closed only However, this strategy is far too simple for serious play and an experienced player should generally aim for a high-scoring yaku or combination of yaku from the beginning of the hand. A new player may find it easiest to avoid opening their hand and simply aim for riichi every time no other yaku is required to win the hand. The most important yaku to learn is riichi, since it is very common and a very easy yaku to achieve. So, as an early part of the game's learning process, it is essential to learn the different yaku listed here and eventually their han values. Declaring a win on a yakuless hand may result in chombo. A hand having no yaku may not win, even if it has multiple dora. In order to win any hand in this game, a player requires at least one yaku. Finally, one special case may be allowed in nagashi mangan. In addition, eleven additional patterns are classed as yakuman. However, possession of dora are not considered as yaku, even though they provide han. For additional scoring, the game also features dora. A player can incorporate several different yaku in the same hand and accumulate their han values for high-scoring hands. The game rules define twenty-six different yaku, worth a different amount of han 「飜」 based on their difficulty or pre-assigned value.

The yaku and their values are essential for scoring.

Players must finish hands before others do and each yaku has specific values attached to them to determine payment amounts. Instead, they are the main factor to determine hand values.

Unlike poker, yaku types do not supercede each other. Many yaku are pattern-based yaku comparable to 'poker hands'. A yaku 「役」 is a certain pattern in a mahjong hand, or a special condition under which a win is declared.

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