Tonpuu
By Kenji Tanaka · Updated
Definition
Tonpuu (tonpuusen) is the East-only game, half the length of a full hanchan: the deal passes once around the table and the game ends. It is the default for quick online matches. The compression changes strategy more than beginners expect. With no South round to repair a bad start, early leads harden fast, aggressive lines get rewarded, and the placement math of the endgame arrives by the fourth hand instead of the eighth.
Tonpuu
Tonpuu (東風, literally “East Wind”) is a mahjong game format consisting of only the East Round, making it the shortest standard game format in modern mahjong.
The mechanics of Tonpuu
Tonpuu represents a condensed version of a complete mahjong session. While a full game traditionally consists of four rounds (East, South, West, and North), tonpuu eliminates all but the East Round. This means the game includes a minimum of four hands, one with each player as the dealer (oya), and concludes after the East Round is complete.
Game Structure
In tonpuu format:
- Only the East Round (Ton) is played
- Each player serves as dealer exactly once
- The game consists of four hands minimum
- Wind changes occur after each hand (unless a dealer wins, which may extend their turn)
- The game ends immediately after the fourth hand or when the East Round officially concludes
Scoring and Completion
The game concludes when all four players have had an equal opportunity to be dealer during the East Round. If a player wins while serving as dealer (tsumo or ron), they may continue as dealer for an additional hand, potentially extending the game slightly beyond four hands. However, once the East Round officially ends, play stops regardless of individual scores.
Modern Usage
Tonpuu has become increasingly popular in online mahjong platforms and casual play settings. It serves several practical purposes:
Time Efficiency: A tonpuu game typically takes 20-40 minutes, depending on playing speed, making it ideal for quick gaming sessions or competitive tournaments with time constraints.
Accessibility: The shorter format makes mahjong more accessible to casual players who may not have time for a full hanchan (eight-hand game) or a complete four-round session.
Tournament Format: Many online tournaments and casual competitive settings use tonpuu as the standard format, particularly for speed mahjong competitions.
Comparison to Other Formats
Tonpuu differs significantly from hanchan, which includes two complete rounds (East and South, a minimum of eight hands). A full-length game (iichan) would include all four rounds. Tonpuu’s brevity makes it distinct and appealing for specific contexts where longer play is impractical.
Tonpuu at the table
“Let’s play a quick tonpuu before dinner, we should be done in about thirty minutes.”
In this context, the speaker is suggesting the shortest standard game format to accommodate time constraints while still maintaining the complete structure of a proper mahjong game.
Another example in tournament context:
“The online tournament uses tonpuu format, so each match is just the East Round. This allows us to run multiple rounds of competition in a single evening.”
Related Terms
Hanchan
半荘
A hanchan is the standard game length: an East round plus a South round, the deal passing through all four seats in each, for a minimum of eight hands. It is the format serious play assumes; tonpuusen, the East-only game, is the quick alternative. Early hands reward building value, and the late South round turns into a placement battle where the score gaps dictate who pushes and who protects.
East Round
東場
The East round (tonba) opens every game, with East as the prevailing wind: East triplets score yakuhai for everyone, and the deal passes once through all four seats. A tonpuu game ends when it does; a hanchan continues into the South round. It is where positions get established and where hot dealers do their early damage.