Predictions made by Ray Kurzweil this decade." Deep Fritz is a computer chess program—generally considered superior to the older Deep Blue — that has defeated or tied a number of human chess masters and opposing chess programs. Due to advances in personal computer performance, the Deep Fritz program can now run on ordinary personal computers, and different versions of it are available for purchase. In September 2002, "Chessmaster 9000", a widely available chess playing game from Ubisoft, defeated the then U.S. Chess Champion and International Grandmaster Larry Christiansen in a four-game match. In 2006 reigning World Champion Vladimir Kramnik was defeated 4:2 by Deep Fritz,
Reversi game has been particularly attractive to programmers. Therefore, the best Othello computer programs have easily defeated the best humans since 1980, when the program "The Moor" beat the reigning world champion. In 1997, Logistello defeated the human champion Takeshi Murakami with a score of 6–0. Analysts have estimated the number of legal positions in Othello is at most 10, and it has a game-tree complexity of approximately 10. Mathematically, Othello still remains unsolved. Experts have not absolutely resolved what the outcome of a game will be where both sides use perfect play. However, analysis of thousands of high quality games