Google DeepMind’s AlphaGo artificial-intelligence program won the last round in a five-game contest against top Go player Lee Se-dol, despite making a bad mistake during play.

The 4-1 margin for AlphaGo in the games played in Seoul, South Korea was not as large as the 5-0 win by the program against an European Go player in October, but carries more impact because of Lee’s standing in the game.

For the most part of the game, commentators were not sure AlphaGo would win. Google DeepMind CEO Demis Hassabis said in a tweet, for example, that AlphaGo made a bad mistake early in the game, but was trying “hard to claw it back.”

The AlphaGo program has been described as the next frontier in AI because of its ability to learn from its experience, which some experts explained include its far-from-human moves that were nevertheless successful.

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