Suuankou

Suuankou

Suuankou (四暗刻, すうあんこう) is one of the standard yakuman hands, where all four melds consist of concealed triplets (ankou). Worth maximum points (typically 8,000 base points for non-dealer, 12,000 for dealer), suuankou represents one of the most iconic and achievable yakuman patterns. You must win by self-draw (tsumo) to qualify.

Detailed Explanation

Requirements

To achieve suuankou, you must:

• Four concealed triplets: All four melds must be triplets formed without calling pon
• Win by tsumo: You must self-draw your winning tile, not call ron
• No open melds: Cannot call pon, chi, or minkan (open kan)

For example: 3-3-3 bamboo, 7-7-7 characters, 9-9-9 dots, South-South-South, plus a pair—all formed without calling melds, won by tsumo.

The Ron Exception

If you win by ron when in tenpai waiting for a pair, the triplet containing your winning tile is considered “open” and disqualifies suuankou. For example:

Tenpai waiting for pair: Your hand is 2-2-2, 5-5-5, 8-8-8, 9-9, with one more 9 needed. If you ron on a 9, the 9-9-9 isn’t fully concealed since you called it → NOT suuankou.

However, if you tsumo the 9 yourself, it remains concealed → Suuankou valid.

This rule makes tsumo mandatory for suuankou, adding to its difficulty.

Difficulty and Rarity

Suuankou is considered one of the easier yakuman to achieve because:

• Triplets are natural: You often draw triplets accidentally during normal hands
• No pattern requirements: Unlike kokushi musou or daisangen which require specific tiles, suuankou accepts any triplets
• Toitoi foundation: Any toitoi (all triplets) hand is a potential suuankou if kept closed

However, the tsumo requirement adds significant luck dependency—you might build a perfect suuankou hand but lose it to a ron opportunity.

Strategic Considerations

Closed Hand Commitment: From the first draw, you must commit to keeping all triplets concealed. Any pon call destroys suuankou potential permanently. This means slower hand development in exchange for yakuman value.

Tsumo Pressure: Late in the hand, players often face a dilemma: should they ron to win immediately or wait for tsumo to preserve suuankou? The risk is that waiting might let opponents win first or exhaust the hand.

Compatibility: Suuankou naturally includes:

• Toitoi (all triplets): Always present but yakuman overrides it
• Sanankou (three concealed triplets): Always present but yakuman overrides it

Usage Example

You’re dealt an exceptional starting hand with pairs that develop into triplets: 4-4-4 bamboo, 6-6-6 characters, White-White-White, and 8-8 dots. You avoid calling any melds and draw the third 8-dots, completing four concealed triplets. Your hand is tenpai waiting for a pair to complete. You self-draw your winning tile, completing the hand by tsumo. You declare tsumo and reveal your hand: suuankou (yakuman). All three opponents pay their share—dealer pays double, non-dealers pay single. Your score: 8,000 base points (32,000 total from non-dealer) or 12,000 base points (48,000 total from dealer).

Related Terms

Sanankou: Three concealed triplets yaku (2 han). One step below suuankou.

Toitoi: All triplets yaku (2 han). Suuankou is always toitoi, but toitoi doesn’t require concealment.

Yakuman: The highest-value hand patterns. Suuankou is one of the standard yakuman.

Ankou: Concealed triplet. Suuankou requires four ankou.