IKMF competition rule. Snatch Rules category.
In marathon Snatch: (1) Arm change can be carried out with a swing, (2) Arm change can be carried out with a two-arm swing and is carried overhead from a dead center only with one arm, (3) Arm change can be made downhill from fixation at any point, (4) If arm change is made uphill from the dead center with one or two arms, the repetition is not counted, (5) During kettlebell arm change, it must not touch the shoulder; otherwise, a 'STOP' command is issued. Multiple switches are permitted.
See the interactive comparison on KETTLEBELL MONSTER™ for filterable views and more detail.