The match of the century was ending in Seoul, Korea. A Google computer program defeated a South Korean master of Go, an ancient board game ＿＿（41）＿＿ its complexity, in their last face-off. Go is a two-person game of strategy said to have been created in China more than 3,000 years ago. The players compete for ＿＿（42）＿＿ by placing black and white stones on intersections of a board of 19 horizontal and 19 vertical lines.