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The 90-Degree Rule in Golf Explained

ByMichael Reeves

← Golf Gameplay & Rules | Fundamentals of Golf Rules


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Quick Answer

  • The 90-degree rule in golf is a specific method for taking relief when your ball is deemed unplayable.
  • It means you drop the ball so it lands and stops at a 90-degree angle relative to the line from your ball’s original spot to the hole.
  • This rule ensures fair play, preventing you from gaining an unfair advantage when taking a drop.

Who This Golf Rule Is For

  • This rule is for any golfer playing by the official Rules of Golf, especially those who compete or want to understand their relief options thoroughly.
  • It’s a must-know for beginners learning the game and for more experienced players looking to refine their course management and understanding of relief procedures.

What to Check First for the 90 Degree Rule in Golf

Before you even think about dropping, get these things locked down. It’ll save you strokes and headaches.

  • Your Ball’s Lie: First things first, is your ball truly in an unplayable spot? This means you can’t reasonably make a stroke at it. We’re talking deep in the woods, stuck in a divot that’s practically a hole, or jammed up against a tree root. If you can get a club on it cleanly, you gotta play it as it lies.
  • Nearest Point of Relief (NPR): This is crucial. You need to find the spot on the course that is farthest from the hole, but no closer to the hole than where your ball originally lay. This NPR must also allow you to stand in a playable position for your next shot. Think of it as your safe zone, as far from the flag as possible without moving closer.
  • Line of Play: Get a clear picture of the line from your original ball position to the hole. This is your reference line. The 90-degree angle you’ll establish is based off this line. Visualize it like a straight shot to the green.
  • Local Rules and Course Conditions: Always a good idea to check if the course has any specific local rules in play that might affect relief procedures. Sometimes, unusual course design or temporary conditions might have a bearing. A quick look at the scorecard or asking a starter can save you trouble.

Step-by-Step Plan for Applying the 90 Degree Rule

Alright, let’s break down how to actually do this. I’ve seen guys mess this up and take penalty strokes they didn’t need to. Don’t be that guy.

1. Declare Your Ball Unplayable:

  • Action: Make the call that your ball is in an unplayable situation. You can do this at any time, though it’s usually when you see you can’t play it.
  • What to look for: A ball that is genuinely impossible to strike cleanly, whether it’s in thick rough, a bunker with a steep lip, or lodged in a tree. Don’t be shy about declaring it if it’s truly a bad spot.
  • Mistake: Trying to play a ball that’s in an impossible position. You might end up taking more strokes trying to escape it than you would by taking a penalty and dropping.

2. Mark the Original Spot:

  • Action: Place a marker (like a tee or coin) precisely where your unplayable ball lies.
  • What to look for: An exact, clear location. This is your starting point for all measurements and reference.
  • Mistake: Forgetting to mark the spot or marking it inaccurately. If you don’t mark it, you’re guessing, and that’s a recipe for disaster.

3. Find Your Nearest Point of Relief (NPR):

  • Action: Identify the spot on the course that is farthest from the hole, but no nearer to the hole than your original ball’s spot. This spot must also allow you to stand comfortably to make a stroke.
  • What to look for: A location that satisfies all three conditions: farthest from the hole, not closer than the original spot, and a playable stance. You might have to walk around a bit to find it.
  • Mistake: Choosing an NPR that is closer to the hole. This is a common and costly error, resulting in a penalty. Always double-check the distance to the hole from your potential NPR.

4. Establish the 90-Degree Angle:

  • Action: Stand at your determined NPR, facing the hole. Now, visualize the straight line from your original ball’s position to the hole. You need to find a spot on the ground that forms a perfect 90-degree angle with this line, extending sideways from your NPR.
  • What to look for: A point on the ground that is perpendicular to the line of play. Imagine drawing a line from your original ball to the hole, and then drawing another line that starts at your NPR and makes a right angle with the first line. The spot where this second line would intersect the ground is your target.
  • Mistake: Guessing the angle. It needs to be a true right angle. If you’re unsure, get down and visualize it, or ask a playing partner to help confirm.

5. Drop the Ball:

  • Action: Hold the ball at shoulder height and drop it so it falls freely and lands on the 90-degree spot you’ve identified.
  • What to look for: The ball making its first bounce on the exact spot you determined.
  • Mistake: Placing the ball down instead of dropping it, or dropping it from too low an altitude. The ball must fall and bounce.

6. Check the Ball’s Final Position:

  • Action: Once the ball has landed and come to rest, observe its final position.
  • What to look for: The ball has come to rest at the 90-degree spot, or has rolled from that spot but is not closer to the hole than where it landed. The ball can roll up to two club-lengths from where it first lands, as long as it doesn’t end up closer to the hole.
  • Mistake: The ball rolling closer to the hole after the drop. If this happens, you must re-drop. If it rolls closer again on the re-drop, you can then place the ball by hand at the spot where it first touched the ground on that second drop.

Understanding the 90 Degree Rule in Golf: Common Mistakes

Getting the 90-degree rule right is key to fair play. Here are the usual pitfalls.

  • Mistake: Incorrectly identifying the Nearest Point of Relief (NPR).
  • Why it matters: This is the foundation of your drop. If your NPR is too close to the hole, your entire drop will be closer than allowed, which is a serious rules violation. You could end up losing strokes.
  • Fix: Always verify that your NPR is the farthest point from the hole, no nearer than your original spot, and allows for a playable stance. Walk it out, check distances to the hole.
  • Mistake: Dropping the ball and not letting it bounce at the designated spot.
  • Why it matters: The rule specifies that the ball must land at the 90-degree point. If you place it or drop it without it hitting the ground first at that spot, you haven’t followed the procedure correctly.
  • Fix: Always drop the ball from shoulder height. Ensure it makes its first contact with the ground at the intended 90-degree location.
  • Mistake: Misinterpreting the “line of play.”
  • Why it matters: The 90-degree angle is relative to the line from your original ball position to the hole. If you don’t have this line clear in your head, your 90-degree angle will be off, leading to an incorrect drop location.
  • Fix: Before you even look for your NPR, clearly visualize the straight line from your ball to the hole. This is your primary reference.
  • Mistake: Not accounting for the ball’s roll after dropping.
  • Why it matters: The ball must come to rest no closer to the hole than where it landed. If it rolls downhill and ends up nearer the hole, you have to re-drop.
  • Fix: When dropping, try to find a spot where the ball is likely to stop or roll away from the hole. If it rolls closer, re-drop. If it rolls closer a second time, you can place it by hand at the spot of the second bounce.
  • Mistake: Assuming the 90-degree rule is the only option for an unplayable ball.
  • Why it matters: Golfers sometimes feel forced to use the 90-degree rule when other relief options might be more advantageous or easier to execute.
  • Fix: Remember that you have multiple relief options when declaring a ball unplayable: taking relief back-on-the-line (dropping anywhere along the line from the hole back through your ball), or taking lateral relief (within two club-lengths of your NPR, not closer to the hole). The 90-degree rule is just one way to take lateral relief.
  • Mistake: Dropping the ball too far away from the NPR.
  • Why it matters: While the ball can roll up to two club-lengths from its landing spot, you must ensure the initial drop is at the 90-degree point relative to the NPR and line of play. If you drop way off, you might be giving yourself too much room or dropping in an unintended area.
  • Fix: Focus on dropping accurately at the 90-degree spot. Let the ball roll its natural course up to two club-lengths, as long as it doesn’t move closer to the hole.

FAQ about the 90 Degree Rule in Golf

  • What is the primary purpose of the 90-degree rule in golf?

The main goal of the 90-degree rule is to provide a fair and consistent method for a golfer to get relief from an unplayable lie without gaining an advantage. It ensures that when you drop, you are taking a fair penalty and re-entering play without improving your position relative to the hole [1].

  • Can I use a tee to mark the 90-degree drop point?

No, you cannot use a tee or any other object to mark the exact spot where the ball must land. The rule requires you to drop the ball from shoulder height, allowing it to land on the intended spot naturally. You can use a marker to identify your original ball’s position and your Nearest Point of Relief, but not the landing spot for the drop itself [2].

  • What happens if the dropped ball rolls closer to the hole?

If your dropped ball rolls and comes to rest closer to the hole than where it landed, you must re-drop. If it rolls closer to the hole a second time after the re-drop, you are then permitted to place the ball by hand at the spot where it first touched the ground on that second drop. This is a bit of a pain, so it’s often wise to try and drop on an uphill slope if possible.

  • Do I always have to use the 90-degree rule for unplayable balls?

Absolutely not. The 90-degree rule is just one of three relief options available when you declare your ball unplayable. You can also choose to drop back on the line of play (keeping your original ball-to-hole line and dropping anywhere behind it) or take lateral relief (dropping within two club-lengths of your Nearest Point of Relief, but no closer to the hole). The 90-degree rule is a specific way to take lateral relief, ensuring a precise sideways drop [3].

  • Can I drop the ball in a penalty area if my unplayable ball is not in one?

Generally, no. When you declare your ball unplayable, your relief options are typically limited to the general area of the course, a bunker (if your ball is in one), or the teeing area (if you’re taking stroke-and-distance relief). You cannot use a penalty area as a relief area unless your unplayable ball is already situated within that penalty area.

  • Is the 90-degree rule the same as lateral relief?

The 90-degree rule is a method of taking lateral relief. Lateral relief means dropping the ball to the side of your original ball’s position, not directly behind it on the line to the hole. The 90-degree rule provides a specific, standardized way to determine where that sideways drop should occur, ensuring fairness and consistency by anchoring it to the line of play.

  • What is the penalty for incorrectly applying the 90-degree rule?

If you incorrectly apply the 90-degree rule, for example, by dropping closer to the hole than allowed or not at the correct spot, you are playing from a wrongly taken relief. The penalty for this is the general penalty, which is two strokes in stroke play and loss of hole in match play. You must then correct the mistake by taking the proper relief.

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