 In the diagram, from a game between future world champion Bobby Fischer and Jan Hein Donner, White had a probably winning advantage; Black had just moved 29...Qg5–f5 and White fell for a swindle.Fischer touched his bishop, intending to move 30.Bd3, which seems like a natural move, but then realized that Black could play 30...Rxc2, and after 31.Bxf5 Rc1 32.Qxc1 Bxc1, the game would be a draw, because of the opposite-coloured bishops endgame.After touching the bishop, he realized that 30.Bd3 was a bad move, but since he was obligated to move the bishop, and other bishop moves were even worse, after several seconds he played 30.Bd3.