When you decide your ball in a bunker is unplayable… under the 2019 Rules, you have an extra option… that lets you drop back-on-the-line outside the bunker for a penalty of two strokes. Imagine a straight line running from the hole through where your unplayable ball is. Identify a spot on that line as far behind the bunker as you like. Measure or estimate a one club-length wide relief area on either side of and behind that spot. Then drop a ball in that area. Your dropped ball must land in and be played from the relief area.