一発勝負

いっぱつしょうぶ【一発勝負】

a contest in which victory or defeat depends on one effort; a one-game match; a once-only [one-shot, 《英》 one-off] contest [match]; a one-shot [《英》 one-off] affair.

●ここはもう一発勝負に出るしかない. We've got no choice but to go for broke here.

●一発勝負の試験 a single-shot test.