It looked a borderline case as to whether he should continue, but he bravely asked to play on after changing helmets.

BBC: England crash to 10-wicket defeat

When a stone is identified as a borderline case between two grades, the system uses an optimisation technique, called a genetic algorithm, to explore the different ways in which the stone could be cut to maximise its value.

ECONOMIST: MONITOR

In any case it was borderline whether the tackle was made in or outside the area.

BBC: Burnley 1-0 Sheff Utd