White and Williams help Exeter survive wobble to hold off Harlequins

• Exeter 17-15 Harlequins• Chiefs struggle in the scrum against Quins packThey still look far from rock solid, but Exeter mark time before the home semi-final they had already secured some time ago with another win, their 16th out of 20. It will be lost on no one, though, that a Harlequins team, who looked from the start as if the recent troubles of their own remain profound, were able to grow into the game. This may be their fifth defeat in a row, but had they inflicted on Exeter a second consecutive defeat at home it would have been perfectly deserved.As it is, the bonus point draws Quins le…