Google's AlphaGo defeats Go grandmaster in final match

South Korean professional Go player Lee Sedol (R) presents the Go game board with his signature to Demis Hassabis, the CEO of Google's London-based AI company DeepMind during a press conference after finishing the final match of the Google DeepMind Challenge Match against Google's artificial intelligence program, AlphaGo, in Seoul, on Tuesday. Google's Go-playing computer program again defeated its human opponent in a final match on Tuesday that sealed its 4-1 victory. [Photo/Xinhua]

Google's Go-playing computer program AlphaGo on Tuesday ended a historic match of the ancient Chinese board game with Go grandmaster Lee Sedol of South Korea by taking a 4-1 lead with its fourth victory in the final match of the best-of-five series.

The final winner was already determined before Tuesday's encounter as Lee lost the first three games of the five-game match. AlphaGo got $1 million in prize, which will be donated to charities.

The human Go champion beat the artificial intelligence (AI), developed by Google's London-based AI subsidiary DeepMind, in the fourth match, but Lee was defeated once again in the final match.