Multiple ron

Multiple ron occurs when a player's discarded tile (or a tile added to a kan) has been claimed for a win by more than one player. Double ron is more common, but triple ron can also occur. The exact handling of the situation depends on the rule variations in use.

Rule variations

There are three main variations to multiple ron:

Atamahane: Only one player can ron. The player closest in turn order to the ronned player gets priority.
Double ron allowed, no triple ron: Up to two players can ron a tile. If three players ron, an abortive draw occurs; this is known as sanchahou.
Triple ron allowed: Up to three players can ron a tile.

Riichi & Renchan

When multiple ron is allowed, the handling of riichi bets and renchan is also subject to variation.

Riichi bets:

All riichi bets go to the player closest in turn order.
Players currently in riichi gain their riichi bets back; leftover bets are given to the player closest in turn order.

Renchan:

So long as the dealer is one of the winners, a renchan occurs.
A renchan only occurs if the dealer is the player closest in turn order.

Sanchachou variation

When double ron is allowed, but triple ron results in a draw, then there is an extra (uncommon) rule variation. Under this variation, when a double ron occurs, the final player must reveal their hand to prove that they could not have legally called ron (this considers furiten). If they could have, then the hand is still an abortive draw. This rule is to prevent a player from choosing not to call ron after hearing that two other players have done so.

Chombo

Main article: Chombo

If a player declares a false win at the same time as another player declares a real one, the chombo penalty is usually nullified. Some rulesets may, however, retain the full penalty, or provide that a lesser penalty be paid.

Rule used in different venues

Location	Winners	Riichi deposits	Current riichi sticks	Bonus counters	Dealership
Head bump¹	1	Priority²	Priority	Priority	Priority
Tenhou	2	Priority	Priority	Priority	Dealer keeps
Mahjong Soul	3	Priority	Priority	Priority	Dealer keeps
Janryumon	3	Priority	Priority	Priority	Priority
Marchao	3	Implied »	Priority	Priority	Priority
ZOO	2	Implied »	Implied »	Priority	...
麻雀WELCOME (AKIBA店)	2	Implied »	Priority	Priority	Priority
Pattern (Fuchuu)	2	Priority	« Implied	Priority	...
Japanese Wikipedia	Varies	Implied »	Priority	Varies	Varies
EMA2016	3	Priority	Winners reclaim, rest priority	Both	Dealer keeps

1. Please note that many organizations use head bump rules (these are not listed here).
2. "Priority" designates current player priority (from discarder: Right > Across > Left), and not game seating priority as used to split ties on Tenhou (starting: East > South > West > North).