The oil conditioner on the lane does not soak into the boards, it sits on top. As balls are thrown, the oil is subtly moved…it might be pushed left and right, or, it might be moved farther down the lane (carried down). Usually, but not always, a house with a lot of carrydown will not allow a ball to hook as much on the back ends and scores will be lower. In some houses and oil patterns, the initial pattern is too much over/under and carry increases as the carrydown effect takes place.
CARRYDOWN
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