In match play, the 15 would get 12 shots. The 12 shots would be given, 1 each hole, on the 12 hardest rated holes, according to the scorecard. In stroke play, the 15 would get 12 shots. If there are stroke play matches on the front and back nine (like a Nassau: front, back, total), the 15 would get 6 on the front and 6 on the back, for a total of 12.