contest between two groups; red vs white match
General term for a competition where participants are divided into two teams, often red and white. Commonly used in school sports days, singing contests, and other events.
See also: 紅白
The red team won the red-and-white contest at the sports day.
intra-squad game; practice match between teammates
Specifically a practice game where a single team is split into two groups, often red and white, for training purposes. Common in baseball and other team sports.
In today's intra-squad game, the regular players were divided into two groups and competed against each other.