The world's top Go player Lee Sedol (R) puts his first stone during the last match of the Google DeepMind Challenge Match against Google's artificial intelligence program AlphaGo in Seoul, South Korea, in this handout picture provided by Google and released by Yonhap on March 15, 2016.[Photo/Agencies]

SEOUL -- Google's Go-playing computer program AlphaGo on Tuesday won its fourth victory over Lee Sedol, the world champion of the ancient Chinese board game, in the final match of the best-of-five series.

The final winner was already determined as Lee lost the first three games of the historic five-game match. The human Go champion defeated the artificial intelligence (AI) in the fourth match, but Lee was defeated once again in the final match.

Lee and AlphaGo exchanged 280 moves for five hours, the longest among the five games. The first match was held last Wednesday in Seoul.