Ittsu (Pure Straight)
Sequences 1-2-3, 4-5-6 and 7-8-9 all in a single suit. 2 han closed, 1 han open. The same-suit cousin to sanshoku-doujun — vertical inside one suit versus sanshoku's horizontal three-suit spread, and the two cannot coexist.
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123m456m789m234p55s
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Sanshoku Doujun (Three-Color Straight)
2 HanThe same numerical sequence in all three numbered suits (e.g., 234m / 234p / 234s). 2 han closed, 1 han open. Often paired with pinfu or tanyao, and structurally exclusive with ittsu — pick one or the other based on whether your early draws cluster vertically or spread horizontally.
Pinfu
1 HanA closed hand of all sequences, with a non-yakuhai pair and a two-sided (ryanmen) wait. Adds zero fu beyond the base — pinfu tsumo stays at 20 fu, pinfu ron rounds to 30. The high-frequency partner of riichi and tanyao in closed-attack templates.
Tanyao (All Simples)
1 HanA hand containing no terminals (1s, 9s) and no honor tiles — only 2-8 of suits. 1 han, open or closed under modern kuitan rules; strict rulesets still require menzen. The workhorse open yaku, easy to lock in whenever the early hand is heavy on middle tiles.
Chinitsu (Full Flush)
6 HanA hand made entirely of one numbered suit. 6 han closed, 5 han open — the highest non-yakuman han floor in the catalogue. Common when one suit floods your hand; stacks naturally with pinfu, iipeiko or ittsu inside the same suit.
Honitsu (Half Flush)
3 HanA hand containing only one numbered suit plus honor tiles. 3 han closed, 2 han open. The workhorse high-value open yaku — combined with a yakuhai triplet it routinely clears mangan even after multiple calls.