Artificial intelligence in the form of an intelligent game agent developed by Elon Musk-backed OpenAI has just defeated one of the world’s top esports players. Danil “Dendi” Ishutin, a famous player of the game Dota, just lost two games in a row and refused to play the third after the bot showed its amazing game play skills.

It’s definitely not the first time AI beat a human at a game, with AI recently besting professional poker players and the world’s top Go player, Lee Sedol. But, this time it’s different, since the competition was held within a much more complicated game environment.

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The culmination of their research took place on a mainstage of the International Dota 2 Championships, one of the biggest esporting events in the world. As the team of researchers mentioned, it only took an hour of training for the bot to learn the necessary skills to dominate built-in game bots. And it took two weeks of learning in real-time to beat the top human player.

Ishutin also mentioned how the bot didn’t hesitate when making certain key decisions, which most of the human players usually do — which again proves how much volatility emotions have on human decision-making process.

“His movement is insane, I’m really nervous. … OK. I give up, he is too strong,” Ishutin said during the gameplay.

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In contrast to chess, esports gameplay for games such as Dota usually contains a lot of hidden information. That’s why intelligent game agents must learn to adapt, create a strategy of attacks and tricks, and even learn the ability to deceive their opponents.

As OpenAI states, the correlation between its bot’s actions-per-minute is comparable to that of an average human player, which means it’s not the ability to execute fast that matters for the gameplay, it’s the skill.

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That is why OpenAI’s win was immediately hailed by Elon Musk, one of the main supporters of the initiative, as an achievement bigger than Google DeepMind’s win in the ancient game of Go.

OpenAI first ever to defeat world’s best players in competitive eSports. Vastly more complex than traditional board games like chess & Go.

— Elon Musk (@elonmusk) August 12, 2017

There is more and more interest coming from big companies to experiment with artificial intelligence within the gaming environments. DeepMind recently announced a partnership with Blizzard, the creator of the wildly popular Starcraft game. They’ve introduced a new way to train bots for Starcraft and released a joint research paper with the outline of the game environment for the reinforcement learning applications.