play-off
noun
[ ˈpleɪɒf ]
• an additional match played to decide the outcome of a contest.
• "a sudden death play-off was required to settle the tournament"
play off
• (of two teams or competitors) play an extra game or match to decide a draw or tie.
• "the runners-up will play off against each other"
• bring two people into conflict or competition for one's own advantage.
• "detectives employ more than one informant so as to play one off against the other"