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Google’s DeepMind scored a second straight win against 18-time Go world champion Lee See-dol last night. The match lasted four and a half hours, going into overtime before Lee accepted defeat.

Afterwards, Lee appeared shocked to lose a second time to the computer program. “Yesterday I was surprised but today it’s more than that — I am speechless,” he said (via The Verge). “I admit that it was a very clear loss on my part. From the very beginning of the game, I did not feel like there was a point that I was leading.”

DeepMind founder Demis Hassabis said he was also surprised by how well the artificial intelligence played the game. He notes that the software pulled off some “surprising and beautiful moves” in an effort to compete with Lee.

The historic match will continue on Saturday when DeepMind could finish up the best-of-five series with a third straight win. For Lee to emerge the victor he’ll need to win the next three games in a row.