Minefield mahjong

Minefield mahjong is a specialized two-player 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. The remaining tiles are to be used for discards.
• In the original work, hands must be mangan or higher. If the hand would score lower, it cannot win.
• 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. (Players 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.

The mangan rule may be turned off for greater hand variation, or to make the game easier for new players.

Scoring

If using the mangan rule, these are the specific rules regarding scoring:

• 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 the opponent deals a winning tile that wouldn't score mangan, the player enters furiten.
• There is no round wind. The first player's seat wind is East and the second player is West.
• No red fives.
• 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.

External links

• Minefield mahjong

Online version of the game