いっ ぽん勝負 しょうぶではありませんでした
ipponshōbudewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 一本勝負

1. It wasn't a one-shot deal.; It wasn't a simple matter.; It wasn't all or nothing.

Past/Perfective
Negative
Polite
Formal Register