Which competition organized by Atari in 1980 brought together thousands of players and popularized video game tournaments?

Fact

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In October 1972, Stanford University hosted a competition based on “Spacewar!”, often cited as one of the first documented video-game tournaments. In 1980, Atari organized the “Space Invaders Championship” in the United States. The event attracted several thousand participants and demonstrated that a video-game competition could reach a national audience beyond a campus or an arcade. It was therefore a major milestone in the history of esports, but not the first tournament in absolute terms. The corrected wording emphasizes its scale and role in popularizing organized competition instead of making a disputed claim of primacy.