Open Hand

Open Hand

Open Hand (副露, fuuro) is a mahjong hand in which a player has called one or more melds from other players’ discards, making those melds visible to all players at the table.

Open Hand in detail

An open hand contrasts with a closed hand (menzenchin) in fundamental ways that affect both scoring and strategic options. When a player calls a meld, whether a pon (triplet, 刻子 koutsu), kan (quad, 槓子 kantsu), or chi (sequence, 順子 shuntsu), those tiles are immediately exposed and arranged in front of that player. This transparency is a defining characteristic of open hand play.

Scoring Impact

The most significant consequence of playing an open hand is the reduction in point value for most yaku (winning patterns). Many yaku carry a scoring penalty when achieved with an open hand, typically scoring at a lower meld count or losing eligibility entirely. For example, a yaku worth 2 han in a closed hand might only score 1 han in an open hand. This penalty reflects the strategic advantage of keeping a hand closed, other players cannot see your progress toward winning, making it harder for them to defend against your hand.

Some yaku are particularly affected by hand openness. Patterns like all simples (tanyao) or all simples (tanyao, which some rule sets do not allow in open hands) may have reduced values or become impossible to declare depending on the specific ruleset being used. Conversely, certain yaku like honor melds or specific sequences may retain full value even in open hands.

Riichi Restriction

A player with an open hand cannot declare riichi, the declaration that signals a closed hand ready to win on the next draw. This is a fundamental rule in most riichi mahjong variants. Since riichi requires a completely closed hand (with the exception of the final winning tile), any previous meld call automatically disqualifies a player from using this declaration. This eliminates access to the riichi yaku itself and the associated scoring bonus.

Strategic Considerations

Players must weigh the immediate benefit of calling a meld against the long-term cost of reduced scoring and lost flexibility. Calling melds early can accelerate hand completion and reduce the number of tiles needed to win, but it locks a player into a visible strategy that opponents can read and defend against. Experienced players often delay calling melds when possible, keeping their hand closed to maintain uncertainty and maximize final scoring.

The decision to call a meld also depends on hand stability and winning probability. If a hand is progressing quickly toward completion, calling melds may be justified despite the scoring penalty. However, if a hand is uncertain or far from winning, keeping it closed preserves the option to declare riichi later.

Naki (Calling)

The act of creating an open hand is called “naki” (鳴く), meaning to call or announce. Players naki by claiming a discarded tile from another player to complete a meld. Each naki transforms the hand’s status from closed to open, with cumulative effects on scoring potential.

Example: Open Hand in a real hand

“After drawing a favorable tile, Yuki decided to naki a chow rather than wait for a riichi declaration. Her open hand would score less, but it brought her closer to winning immediately. Her opponents could see her building a simple hand, but the risk paid off when she completed her winning combination two turns later.”