During the last three years, the level of Go programs has improved tremendously due to a new technique: Monte-Carlo Tree Search. In 2008, several Human-Computer Go events have been organized to assess the level of the new programs. MOGO (in some contests called MOGO TITAN) and CRAZYSTONE, the two pioneer Monte-Carlo Go Tree Search programs, managed to defeat professional players for the first time in history. MOGO won on the 9x9 board, and MOGO TITAN on the 19x19 board with a 9-stones handicap. A short time later, CRAZYSTONE set a new record by winning a game on a 19x19 board with an 8-stones handicap. In this report, we present the results of the most important human-computer matches that took place in 2008, in the USA, Japan, and Taiwan.
