Minefield mahjong

Minefield mahjong is a specialized mahjong variant found in the anime and manga series, Kaiji. This variant features two players, who take 34 tiles and arrange 13 of them into a tenpai hand. Any remaining tiles are used as player discards, where the players take turns making their discards. In a sense, this can be interpreted as a tile discard reading drill for defense practice.

Rules

• Players gather 34 tiles.
• Use 13 tiles to form a tenpai hand. In the original work, players can only win with a mangan or higher hand. The remaining tiles are to be used for discards.
• Determine player order by any method (e.g. dice roll or coin flip). Then, take turns making discards.
• If a discarded tile is the other player's winning tile, then ron may be called. (You cannot win by tsumo.)
• If a player discards their own winning tile, they become furiten as usual, and can no longer win.
• After 17 discards by both players, the game ends in a draw.

Specific rules:

• Kiriage mangan is enabled, so 4 han 30 fu hands count as mangan.
• Players start the game in riichi (but not double riichi), so all hands have the riichi yaku.
• Ippatsu is scored on the opponent's first discard; there is no renhou.
• Atozuke is allowed. If a player deals a winning tile that wouldn't score mangan, you are in furiten.
• There is no round wind. The first player's seat wind is East and the second player is West.
• Kan is not allowed.
• If you cannot or do not wish to make a mangan hand, your hand can be in noten with no chombo penalty.

The mangan rule may be turned off for greater hand variation. Alternatively, both players could start in double riichi, giving each player +2 han instead of the "default" +1.

External links

• Minefield mahjong

Online version of the game