Iipeiko (Pure Double Sequence)

1 HanClosed only

Two identical sequences (e.g. two 234m) in the same suit, in a closed hand. 1 han, closed-only — any call kills it outright. Replaced by ryanpeikou (3 han) when the hand contains two such pairs of identical sequences.

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Example hand

112233m456p789p88s

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Related yaku

Riichi

1 Han

Declared on a closed tenpai hand by discarding sideways and betting 1000 points. Locks the hand and unlocks a chance for ippatsu and uradora.

Ippatsu

1 Han

Winning within one go-around after declaring riichi, before any call or kan interrupts the turn. Closed-only by virtue of requiring riichi, and one of the cheapest ways to add a free han to a riichi hand — it stacks freely with everything else riichi unlocks.

Menzen Tsumo

1 Han

Winning by self-draw on a fully closed hand (no calls). The default kicker on any closed tsumo win, which is why riichi + pinfu + tsumo is the canonical fast-cheap closed-attack template.