The par-three 6th at Riviera Country Club—venue for this week’s Northern Trust Open—has a bunker in the middle of its green. So do holes at Doonbeg in Ireland, TPC San Antonio in Texas and Shadow Ridge Country Club in Nebraska. Is it a gimmick or a stroke of genius? Dustin Johnson aced the sixth in 2010, albeit to a pin location below and away from the bunker. Riviera members and guests are not allowed to use anything but a putter on the green, even when the bunker is between their ball and the hole. Good luck getting down in two if that’s the case. But here’s a look at how it can be done.