
Office worker K recently went out for a round of golf with friends after some time away. Naturally, they had a small wager riding on it. On one hole, while taking a practice swing before an iron shot from the fairway, K accidentally nudged the ball. A friend watching from right beside him said K had to take a one-stroke penalty for touching the ball.
But K, who had studied the rules of golf to some extent, recalled the definition of a stroke. He argued that a practice swing is not a stroke, so no penalty applies. Who was right?
The answer is that a one-stroke penalty applies. As K said, a practice swing is indeed not a stroke, because it is not a movement of the club made to strike the ball in the intended direction of play (Definitions of Terms). But regardless of the reason, because K moved a ball in play, the one-stroke penalty cannot be avoided (Rule 9.4b). The moved ball must, of course, be replaced in its original spot (Rule 9.4a). If the next shot is played without replacing it, the player also incurs the general penalty (two strokes) for playing from a wrong place (Rule 14.7b).
Whether a penalty applies when a ball is moved varies slightly depending on where the ball was located. As in the case above, if it was in the general area such as the fairway or rough, a one-stroke penalty applies. The same is true in a penalty area.
If a ball is moved in a bunker, a closer look is needed. If only the ball was moved, a one-stroke penalty is correct, but if the club also touched the sand during the practice swing, the general penalty applies (Rule 12.2b). In this case, the two strokes are not added to the one stroke for a total of three; only the two strokes for touching the sand are given. This is because when there are multiple rule breaches arising from a single act, the player receives only the higher-level penalty (Rule 1.3(4)).
There are also cases where moving the ball during a practice swing carries no penalty—namely, in the teeing area and on the putting green. In the teeing area, the ball is not in play until a stroke is made, so there is no penalty. Because it was before the ball was in play, the moved ball may be placed anywhere in the teeing area (Rule 6.2b(5)). On the putting green, because the space is tight and there is a chance of accidentally moving the ball, no penalty is given. The moved ball must be replaced on its original spot (Rule 9.4b Exception, Rule 13.1d(1)).
As shown here, in golf, the handling method and whether a penalty applies often differ by area even for the same act. For accurate application of the rules, you must always start by determining where the ball was located.

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