Playing chess against a computer is not always a fun thing to do... Here we have a screenshot of the match between chess computer Deep Fritz (white) vs World champion Kramnik (black). Kramnik played Qe3?? as you can see on the diagram. That was a big mistake.

Later he said: "It was very strange, some kind of blackout. It's the first time I have been mated in one. I cannot find any explanation." Grandmasters and other strong players use pattern recognition derived from thousands of previous games to spot opportunities and dangers. With a white knight at f6 or g5 rather than f8, the pattern is elementary.

Two factors probably led to Kramnik's blind spot. First, the knight unusually reached f8 as part of a capturing sequence rather than by a simple threat, so Kramnik's mind could remain fixated on his own plans. What would be your choice if you were black? Would you have done the same?