Calculators are out for Roma-City CL decider

AS Roma and Manchester City clash for a place in the last 16 of the Champions League on Wednesday, with outsider CSKA Moscow lurking in the background.

The head-to-head rule which UEFA uses to separate teams that are tied in points means any number of complex connotations are possible as the three sides bid to follow runaway Group E leader Bayern Munich into the next round.

Manchester City has never won a competitive match in Italy in four previous attempts and, even if it breaks that skid, could still suffer another premature group stage exit.