回合 (huí hé): one of a sequence of contests (or subdivisions of a contest) between the same two opponents; round (boxing etc); rally (tennis etc); frame (billiards etc); inning; (tennis, soccer etc) rubber or leg; round (of negotiations)

This boxing match went the full twelve rounds, and by the end both fighters were so exhausted they could barely stand.

In the first round, the challenger unexpectedly knocked down the defending champion, and the entire audience was stunned.

The Go match uses a best-of-three format: whoever wins two rounds first wins the final victory.

The debate entered its final round, and the fourth debater of the affirmative side refuted the opponent's argument with a series of powerful statistics.

The two moved back and forth on the board for over twenty rounds, and still neither could gain the upper hand.