The Democratic Republic of Congo beat the Republic of Congo 4-2 in the Africa Cup of Nations quarter-final on Saturday. The Republic of Congo team is mostly young and inexperienced, and drawn from a population one-16th the size of the DRC. It was lucky to qualify, getting through only after Rwanda was disqualified for fielding an ineligible player. On paper at least, the result was to be expected. All the same, the game was the most exciting of the tournament so far, with the DRC coming back from two goals down.