KENZAN! MAHJONG: THE YAKU REFERENCE

KENZAN! MAHJONG: THE YAKU REFERENCE Use this as a standard riichi reference while building hands. Kenzan's in-game rule display remains the authority for optional patterns and special-limit treatment. The sources checked do not provide a complete photographed Kenzan yaku menu, so optional house rules are not presented as confirmed game features. A hand can combine compatible yaku. "Closed" means no chi, pon or open/added kan; a concealed kan does not itself open the hand. Values below are han before dora. Standard hands still require four groups and a pair unless the entry says otherwise. ONE-HAN PATTERNS Riichi: declare a closed ready hand with the 1,000-point deposit. Menzen Tsumo: complete a closed hand on your own draw. Ippatsu: win in the first uninterrupted turn cycle after declaring riichi. An intervening call breaks the opportunity. Tanyao, All Simples: every tile is a suited 2–8. Kenzan's Open Tanyao option determines whether calls are allowed for this yaku. Yakuhai, Value Honors: a triplet or quad of a dragon, your seat wind or the round wind. Each qualifying group scores; a wind that is both your seat and the round wind supplies two han. Pinfu: closed, four sequences, a non-scoring pair and a two-sided sequence wait. A pair of your seat wind, round wind or a dragon prevents pinfu. A 1–2 waiting for 3, 8–9 waiting for 7, inside gap or pair wait also prevents it. Iipeikou: closed, two identical sequences in the same suit, with the remaining groups and pair completing the hand. Haitei: win on the final live-wall draw. Houtei: win on the final discard following that last draw. Rinshan Kaihou: win on the replacement draw after declaring a kan. Chankan: win by claiming the tile someone uses to extend an exposed triplet into a quad. Special interactions with concealed kans depend on the ruleset. TWO-HAN PATTERNS Double Riichi: declare riichi on your first uninterrupted turn. It replaces ordinary riichi rather than adding two han on top of it. Chiitoitsu, Seven Pairs: closed, seven distinct pairs. Four copies of one tile cannot count as two pairs. This uses fixed 25 fu. Toitoi: all four groups are triplets or quads. Open is allowed. Sanankou: three concealed triplets/quads. A triplet completed by ron is not concealed for this count, even if the overall hand was closed before winning. Sanshoku Doukou: the same-number triplet/quad in all three suits, plus the fourth group and pair. Sankantsu: three declared quads, with the fourth group and pair. Shousangen: two dragon triplets/quads and a pair of the third dragon. The two dragon-group yakuhai also add their own han. Honroutou: only terminals and honors. With no sequences possible, the completed hand also fits Toitoi or Seven Pairs. Honors are not numbered terminals; a pure-terminal yakuman is different. CLOSED/OPEN VALUES THAT DIFFER Sanshoku Doujun, 2 closed / 1 open: the same sequence in all three suits, such as 2–3–4 characters, circles and bamboo. Ittsu, 2 / 1: 1–2–3, 4–5–6 and 7–8–9 sequences in one suit. Merely holding each number somewhere is not enough; the hand must contain those three sequences. Chanta, 2 / 1: every group and the pair contains a terminal or honor, and the hand includes at least one sequence. Any sequence must therefore be 1–2–3 or 7–8–9. Junchan, 3 / 2: every group and the pair contains a terminal, with no honors and at least one sequence. It replaces Chanta rather than stacking with it. Honitsu, Half Flush, 3 / 2: one numbered suit plus honors. Tiles from either other suit break it. Chinitsu, Full Flush, 6 / 5: one numbered suit only, with no honors. It replaces Honitsu. RANGE OF CLOSED HANDS Ryanpeikou, 3 han: closed, two separate pairs of identical sequences. It replaces Iipeikou. Although the tiles can look like seven pairs, score the valid interpretation rather than adding incompatible hand structures together. STANDARD YAKUMAN PATTERNS Kokushi Musou, Thirteen Orphans: closed, one of each of the six numbered terminals and seven honors, plus a duplicate of one of those 13 types. Suuankou: four concealed triplets/quads and a pair. On ron, the winning tile must complete the pair if all four triplets are to remain concealed. A self-draw can complete the last concealed triplet. Daisangen: triplets/quads of all three dragons. Shousuushi: three wind triplets/quads plus a pair of the fourth wind. Daisuushi: triplets/quads of all four winds. Tsuuiisou: a valid hand made entirely of honors. Chinroutou: a valid hand made entirely of numbered terminals, with no honors or simple tiles. Ryuuiisou, All Green: only 2, 3, 4, 6 and 8 bamboo and the green dragon, arranged as a valid hand. Chuuren Poutou, Nine Gates: closed, one suit with the core 1112345678999 plus one additional tile of that suit. Suukantsu: four declared quads plus a pair. Tenhou: the dealer wins on the initial 14-tile deal. Chiihou: a non-dealer wins on the first uninterrupted self-draw turn. Special waits sometimes receive double-yakuman treatment, and some rulesets recognize additional patterns such as Renhou, Open Riichi or Nagashi Mangan. Do not build a Kenzan completion plan around those variants without checking its rule screen. A normal riichi hand with dora is a more practical route to 50,000 points than waiting for a rare limit hand.