いっ ぽん勝負 しょうぶじゃなかったです
ipponshōbujanakattadesu

Noun
Desu Copula

The polite, past negative form of 一本勝負

1. It wasn't a one-shot deal.; It wasn't all or nothing.; It wasn't a do-or-die situation.

Past/Perfective
Negative
Polite
Casual Register