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Gamers everywhere were watching as OpenAI, an artificial intelligence lab co-founded by Elon Musk, pitted a team of bots against some of the world’s best Dota 2 players at an annual tournament back in June.
Machines had been on a winning streak. In 2016, DeepMind’s AI mastered Go. In 2017, a poker-playing bot called Libratus, developed by a team at Carnegie Mellon University in Pennsylvania, won a professional Heads-Up No-Limit Texas Hold ‘Em tournament. Dota 2, a popular online battle …