Chess Boxing

All right, I just caught the tail-end of a SportsCenter segment and just had to look this up on wikipedia.

A match between two opponents consists of up to eleven alternating rounds of boxing and chess sessions, starting with a four-minute chess round followed by two minutes of boxing and so on. Between rounds there is a 1 minute pause, during which competitors change their gear. The form of chess played is "blitz chess" in which competitors have a total of twelve minutes. Competitors may win by knockout, checkmate, a judge's decision or if their opponent's twelve minutes of chess time elapses.

And, of course, it's on youtube.