This is the 4175th most frequent Japanese word.
一騎打ち
A one-on-one duel or fight.
Here, '一騎打ち' refers to a direct, one-on-one duel between two individuals.
彼は一騎打ちで相手を打ち負かした。
He defeated his opponent in a one-on-one duel.
In this context, '一騎打ち' is metaphorically used to describe a competitive match between two players.
将棋の試合はまさに一騎打ちだった。
The game of Shogi was indeed a one-on-one confrontation.
Used literally, '一騎打ち' refers to literal duels or skirmishes between individual warriors.