BARDEN’S CHESS PROBLEMS

Magnus Carlsen v Sven Tjomsland, Gausdal, 2002

World champion Carlsen is sure to be one of the all-time chess greats. His imaginative touch was already there when he reached today’s diagram as an 11-yearold schoolboy. On the face of it, White (to move) is fighting for a draw against Black’s extra knight, but several moves earlier, Carlsen had foreseen the winning trick, which he now unleashed, inducing Black’s immediate resignation. What was White’s knock-out blow, and why was it decisive?