noun
game all
Tennis term used when both players or teams have won the same number of games in a set, e.g., 1-1, 2-2.
スコアはゲームオールで、次のゲームが重要だ。
The score is game all, so the next game is crucial.
Variant with interpunct, sometimes seen in written materials.
デュース is used when the score is 40-40 within a game, while ゲームオール refers to the number of games won in a set being equal.
Borrowed from English 'game all', used in tennis scoring.