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). It pays the full yakuman amount (32,000 points to a non-dealer, 48,000 to the dealer) and is one of the most iconic and achievable yakuman patterns. The famous wrinkle: whether you may win by ron depends entirely on your wait shape.

How Suuankou plays out at the table

Requirements

To achieve suuankou, you must:

• Four concealed triplets: All four triplets formed from your own draws, without calling pon
• No open melds: No pon, chii, or open kan anywhere in the hand (a concealed ankan is fine)
• A qualifying win: On a tanki (pair) wait, either tsumo or ron works. On a shanpon (dual-pair) wait, only tsumo works, because a ron would make the final triplet count as open.

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.

Shanpon vs. Tanki: The Ron Rule

A triplet completed by ron counts as open for concealment purposes. Which wait you hold decides everything:

Shanpon wait (must tsumo): Your hand is 2-2-2, 5-5-5, 8-8-8, plus 9-9 and 3-3, waiting on a 9 or a 3 to become the fourth triplet. Ron on either tile and that final triplet counts as open: the hand downgrades to toitoi plus sanankou, a big score but no yakuman. Tsumo it yourself and suuankou stands.

Tanki wait (ron is fine): Your four triplets are already complete and a lone tile waits to become the pair. The winning tile joins the pair, not a triplet, so nothing becomes open. You may ron freely, and many rule sets score this suuankou tanki as a double yakuman.

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 shanpon-must-tsumo rule adds real luck dependency: a finished suuankou shape on the wrong wait can be forced to pass on its own winning tile.

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.

Shanpon Pressure: On a shanpon wait, players face a real dilemma when their tile is discarded: ron immediately for toitoi plus sanankou, or pass (accepting temporary furiten) and hope to tsumo the yakuman? Where possible, steering the finished hand toward a tanki wait removes the dilemma entirely.

Compatibility: Suuankou naturally includes:

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

Walking through Suuankou

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 with a lone 2-circles left over: a tanki wait on the pair. Because the winning tile completes the pair rather than a triplet, you may win by ron or tsumo, and either way the hand is suuankou (yakuman): 32,000 points as a non-dealer or 48,000 as the dealer, with many rule sets doubling it for the tanki wait. Had your last shape instead been two pairs (a shanpon), only a tsumo would have preserved the yakuman.