Chessboxing is a hot new sport in Europe that is largely unknown on this side of the pond. It involves 34 men, 64 squares and one ring -- and you have to see it to believe it. CBS News correspondent Mark Phillips is in London is giving viewers a closer look at the game.

On one side of the ring, there's Andy "The Rock" Costello. You wouldn't want to be his punching bag. On the other side of the ring, there's Nikolai "The Siberian Express" Sazhin, who never met a blini he didn't like.

They're both a new kind of fighter.

They don't just try to knock each others' brains out: They also use what's left of their brains. The two men will battle it out over the chess board, wearing headphones so they can't hear the crowd shouting moves. Then they'll box each other in the ring. Chessboxing is 11 alternate rounds. It's three minutes of chess, followed by three minutes of boxing. You can either win by a knock out or by check mate, which ever comes first.