evenly matched Go game
A Go term for a game between two players of equal strength. Not used outside the context of Go.
今日の対局は相碁で、どちらが勝つかわからない。
Today's match is an evenly matched Go game, so it's hard to tell who will win.
From 相 (mutual) + 碁 (Go). The exact historical derivation is uncertain, but the term is conventionally used in Go circles.