London Bike Polo League II (winter 2009/2010)

"one of four, six or eight divisions into which a polo match is divided"

Much more precise.

You are quoting out of context. Your quote refers to the flexibility of the chukker.

A chukker is a period of play in polo. You can do all the verbal gymnastics you want, but "chukker" has a clear definition in the context of polo that is broadly accepted, and "game" does not.