A RUSSIAN man has been crowned world champion in the novelty sport of chess boxing, a game that requires equal skill at moving pawns and throwing punches. Mathematics student Nikolai Sazhin, 19, competing under the name "The President'' knocked out a 37-year-old German policeman Frank Stoldt, who served as a peacekeeper in Kosovo until recently. The loser said he was simply too punch-drunk to fend off checkmate. "I took a lot of body-blows in the fourth round and that affected my concentration. That's why I made a big mistake in the fifth round: I did not see him coming for...