Checkmate: Kasparov loses second game of virtual chess series

After a three-hour battle against a computer, international chess master Garry Kasparov made a mistake late in the game and his challenger "pounced."

X3D Fritz, a 12-year-old German program, defeated its IBM rival Deep Blue in 1995. Kasparov was world champion between 1985 and 2000; he beat Deep Blue in 1996, but an upgrade defeated him the following year.

The next match will be Sunday, and Game 4 on Nov. 18. Live on ESPN2.