View source for Atamahane

[[Image:Atama ron.png|thumb|right|250px|[[Toimen]] granted [http://tenhou.net/0/?log=2015011712gm-000b-18445-4f89034e&tw=0&ts=4 the win], when double ron is not used.]]
'''Atamahane''' {{kana|頭ハネ}}, sometimes called the "head bump" rule in English, is a rule that only allows one winner per hand. When two or more players declare [[ron]] on the same tile, only the player closest in turn order to the discarder wins - the other players get nothing.<ref>Some niche rulesets allow the player ''furthest'' in turn order to win instead, meaning if West deals in, South gets priority.</ref>  For example, if West deals in, North has priority, followed by East.

The alternative to atamahane is allowing [[double ron]]. Some rules allow double ron, but [[abortive draw|abort the hand]] on a [[Sanchahou|triple ron]]. Other rules allow double and triple ron. In rulesets where double/triple ron are allowed, the [[riichi]] bets are typically subject to atamahane (e.g. if West deals in to North + South, North gets the riichi bets, but both players win.)

Atamahane is relatively more common in real life rulesets, while double ron is relatively more common in online rulesets. However, this is not a hard rule, so offline rulesets can use double ron and vice versa.