Both are hard to pin down, but a "lucky" air strike by Nato or a dramatic wave of defections could be crucial.

BBC: Who's in charge? Sorting out Libya's rebel armies

Yet Don spent that day in a panic, struggling to devise an ad for Lucky Strike cigarettes.

NEWYORKER: Faking It

Robertson says he got a "lucky break" when the miners went on strike.

FORBES: Fuel's Paradise

His colleague Pete wanted Lucky Strike to embrace death, but Don knew that a distraction was needed.

NEWYORKER: Faking It

But he was lucky with his goal, snatching at a Valencia cross only for the ball to strike him flush in the face before deflecting into the net.

BBC: Chelsea 1-3 Man Utd

Tell Betty not to wait up: this escape is the lucky strike you've been waiting for and you'd be a mad man to miss it.

BBC: Daily deal: Mid-century mod in Miami