Kuitan

Kuitan

Kuitan (喰い断) refers to the allowance of tanyao (all simples) as a scoring hand when achieved through open melds. The term literally translates to “eating/using simples” and represents a fundamental rule variation in mahjong that significantly impacts hand-building strategy and scoring potential.

Detailed Explanation

In standard mahjong, tanyao requires a hand composed entirely of numbered tiles from 2 to 8 (bamboo, characters, and dots), excluding all honor tiles (winds and dragons) and terminal tiles (1s and 9s). Traditionally, some rulesets restricted tanyao to closed hands only—hands where all melds were concealed and the winning tile came from the wall or the discard of another player without calling it.

Kuitan eliminates this restriction, allowing players to score tanyao even when they have called one or more open melds (chow, pung, or kong) during play. This opens significantly more possibilities for completing tanyao hands, as players can actively pursue and declare melds from other players’ discards rather than waiting passively for a closed hand.

The distinction between kuitan-allowed and kuitan-forbidden rules creates two major mahjong rule frameworks:

Ari-ari mahjong (有有, literally “has-has”) permits kuitan and represents the more permissive ruleset. This is the standard in many regions, particularly in online mahjong and casual play. Under ari-ari rules, tanyao becomes a more accessible and frequently scored hand.

Nashi-nashi mahjong (無し無し, literally “no-no”) forbids kuitan, requiring tanyao to be achieved only through closed hands. This stricter ruleset makes tanyao rarer and more valuable, often worth higher point values to compensate for the increased difficulty.

Strategic Impact

The kuitan rule significantly influences hand selection and discarding strategy. In ari-ari games, players pursuing tanyao can aggressively call tiles from discards, increasing their speed and reliability in completing the hand. In nashi-nashi games, tanyao players must exercise restraint and avoid calling melds, accepting slower completion times in exchange for the hand’s validity.

This rule variation also affects the relative scoring value of hands. In nashi-nashi rulesets, tanyao is often worth more points because of its restricted accessibility. Players must weigh whether to call a tile that advances their tanyao hand or preserve the closed-hand requirement for higher scoring potential.

Usage Example

A player is building a hand with tiles: 2-3-4 bamboo (open pung), 5-6-7 characters (open chow), and 2-3-4-5-6 dots (open sequence in progress). They are waiting for a 7 of dots to complete their hand.

• Under kuitan rules (ari-ari): The player can openly call the 7 of dots when another player discards it, completing tanyao with open melds. The hand scores for tanyao plus any other applicable patterns.

• Under kuitan-forbidden rules (nashi-nashi): The player must discard the melds they have already called, close their hand, and wait for the 7 of dots to come from the wall or be discarded while they maintain a fully closed hand. Only then can they score tanyao.

Related Terms

• Tanyao: The hand pattern requiring all simples (2-8 tiles only)
• Ari-ari: The permissive ruleset allowing kuitan
• Nashi-nashi: The restrictive ruleset forbidding kuitan
• Naki: The act of calling or melding tiles from other players’ discards
• Open Hand: A hand containing one or more visible melds
• Closed Hand: A hand with all melds concealed until winning