Google DeepMind’s AlphaGo scored another win Thursday against star South Korean player Lee Se-dol, giving a boost to Google’s growing position in the field of artificial-intelligence.

The close contest in Seoul was the second in a series of five games being played in South Korea, the last of which is scheduled for Tuesday.

On Wednesday, a shocked Lee had resigned the first game to AlphaGo in a cliffhanger.

AlphaGo appears to have surpassed its first day’s play with Lee saying that if he was surprised on Wednesday, he was now “speechless.” From the beginning of the game, there was not a moment when he felt he was leading in the game, Lee told reporters. In the game Thursday, AlphaGo’s moves were flawless unlike in the previous day when some moves were problematic, he said.

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