A "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends. What is it?

Common Wrong Answers
“Soccer”
In soccer, the score is visible on the scoreboard and known to both spectators and players throughout the match.
“Basketball”
Basketball has a scoreboard that displays the score in real-time, allowing both players and fans to know the current status of the game.
“Tennis”
Tennis matches have a visible score, and both competitors and spectators can see who is leading and by how much during the match.
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