Riichi

Riichi

Riichi (立直, りーち) is a declaration in Japanese mahjong announcing that a player’s hand is one tile away from winning (tenpai). By declaring riichi, a player commits 1,000 points and places a riichi stick on the table, locking their hand and earning one han (value point). This mechanic is fundamental to Japanese mahjong and opens access to additional scoring opportunities.

Detailed Explanation

Riichi is both a yaku (scoring hand pattern) and a strategic declaration that fundamentally shapes gameplay. When a player declares riichi, several things occur simultaneously:

The Declaration Process A player may declare riichi only when their hand is tenpai (one tile away from completion) with a closed hand—meaning no melds have been made. The player announces “riichi,” pays 1,000 points from their score, and places a physical riichi stick perpendicular to their discard pile. This stick remains visible throughout the hand and serves as a warning to other players.

Hand Lock Once riichi is declared, the player’s hand becomes locked. They cannot change their winning condition or rearrange tiles. If they draw a tile that doesn’t complete their hand, they must discard a tile without modifying their tenpai state. This inflexibility is the trade-off for riichi’s benefits.

Scoring Value Riichi itself is worth 1 han. Combined with the base hand value (fu), this increases the final score. However, riichi’s primary value lies not in the han itself but in the additional scoring opportunities it enables.

Uradora and Ippatsu Declaring riichi unlocks two powerful bonus yaku:

• Uradora (裏ドラ): Flip-side dora tiles become active when a player wins after declaring riichi. These hidden bonus tiles can significantly increase hand value.
• Ippatsu (一発): If a player wins on the very next turn after declaring riichi (before anyone else discards), they earn ippatsu, an additional 1 han.

Dama vs. Riichi

A strategic choice exists between declaring riichi and playing “dama” (playing silently without declaring). Dama means keeping your tenpai status hidden while foregoing riichi’s benefits. Dama is safer because opponents don’t know you’re close to winning, but you lose uradora and ippatsu opportunities. Riichi is more aggressive and rewarding but telegraphs your danger to the table.

Furiten Consideration

A player in furiten (having discarded a tile they need to win) cannot declare riichi, as they can no longer achieve their declared tenpai. This rule prevents players from abusing riichi’s declaration.

Usage Example

A player holds a closed hand needing only a 5-pin to win. They have no melds and are certain of their tenpai. They declare riichi, pay 1,000 points, and place a riichi stick. On the next turn, they draw a 5-pin and win. Because they declared riichi and won on the next turn, they score ippatsu (1 han). Additionally, uradora tiles flip, potentially adding more han to their final score. Their hand now scores significantly higher than if they had played dama.

Related Terms

Tenpai: The state of being one tile away from winning; the prerequisite for declaring riichi.

Ippatsu: One additional han earned by winning immediately after declaring riichi.

Uradora: Hidden bonus dora tiles that become active when winning after a riichi declaration.

Dama: Playing with a closed, winning-ready hand without declaring riichi; a silent alternative strategy.

Furiten: A restriction preventing riichi declaration when a player has discarded their needed winning tile.

Menzenchin: A yaku for winning with a completely closed hand, often paired with riichi.