Ankan

Ankan

Ankan (暗槓) is a concealed kan, a special meld in mahjong where a player declares four identical tiles drawn entirely from their closed hand.

Detailed Explanation

An ankan represents one of the most valuable melds in mahjong, combining the strategic advantage of concealment with the mechanical benefits of kan declarations. The term breaks down into two components: “an” (暗), meaning dark or concealed, and “kan” (槓), meaning a meld of four identical tiles.

How Ankan Works

When you possess four identical tiles in your closed hand, you may declare an ankan by placing all four tiles face-down on the table in front of you, typically arranged in a specific pattern to distinguish them from other melds. Unlike minkan (open kan), which requires at least one tile from another player’s discard, ankan uses only tiles from your own hand.

The declaration of an ankan triggers several mechanical effects:

Dora Indicator: When you declare an ankan, the dora indicator advances one tile. This reveals a new dora, potentially increasing the value of your winning hand. If you declare multiple ankans, each one advances the indicator separately. The kan dora can be particularly valuable because it applies to all players’ hands, not just your own.

Kan Dora: Beyond the regular dora indicator advancement, kan declarations also generate kan dora (槓ドラ), which is the tile immediately following each kan dora indicator. This creates additional point-scoring opportunities.

Hand Concealment: Declaring an ankan maintains the closed status of your hand, preserving your eligibility for yaku that require a completely closed hand, such as menzen tsumo (going out with a self-drawn tile from a closed hand). This distinguishes ankan from minkan, which breaks the closed hand requirement.

Tile Replacement: After declaring an ankan, you draw a replacement tile from the back of the wall (the dead wall section), maintaining your 13-tile hand size. This fresh tile draw can sometimes provide the final piece needed for victory.

Strategic Considerations

Declaring an ankan is not always advantageous. While the dora indicator advancement benefits all players, it may help your opponents more than yourself, particularly if they are closer to winning. Players must weigh the immediate point value gained against the risk of providing better draws for competitors.

Timing matters significantly. Declaring an ankan early in the round may generate multiple dora indicators before the hand concludes, but it also telegraphs information about your hand composition to observant opponents. Declaring an ankan late in the round provides less opportunity for others to benefit from the dora advancement.

Usage Example

You hold four 5-bamboo tiles in your hand. You declare ankan by placing them face-down on the table. The dora indicator advances, revealing a new dora tile. You then draw a replacement tile from the dead wall. If you eventually win with this hand, your final score includes points from both the regular dora and any additional kan dora generated by your ankan declaration, plus the base value of your winning hand and yaku.

Related Terms

• Kan: The general category of four-tile melds, encompassing both ankan and minkan
• Minkan: An open kan declared using three tiles from your hand and one from an opponent’s discard
• Dora: Bonus tiles that increase hand value; dora indicators advance with kan declarations
• Kandora: The additional dora generated specifically by kan declarations
• Meld: The broader category of declared tile combinations, including kan, pung, and chow