What happens if I use green-reading materials?

Rule 10.2b doesn't specifically mention green-reading books or maps. It covers getting help from your caddie or others with line of play, and bans setting objects down to help with aiming or stance. If you set a green-reading book down to aim, that's a breach.

What Rule 10.2b actually covers

Rule 10.2b is titled "Other Help" and it limits the kind of assistance you can get during a round. It breaks down into three main parts: what your caddie can and can't do with line of play (10.2b(1)), what other people can do (10.2b(2)), and a flat ban on setting any object down to help you aim, take your stance, or swing (10.2b(3)). The rule doesn't name green-reading materials, but the principle is clear — you can't use an object as an alignment aid.

Using a green-reading book during play

Reading a green-reading book while you're standing over your putt isn't addressed in Rule 10.2b. The rule targets physical objects set down to aim by (like a club laid on the ground) or a caddie standing in a restricted area. If you hold a book, read it, put it away, then putt — that's not a Rule 10.2b issue. But if you prop the book open behind your ball to show the line, you've set an object down to help with aiming, and that's a breach of 10.2b(3).

Penalty for breaching 10.2b

The penalty for breaching Rule 10.2b is the general penalty: two strokes in stroke play, loss of hole in match play. It applies per breach, so setting down a green-reading book to aim on three different holes would be three separate penalties.

Exceptions that change the answer

• You share a caddie with another player → You may ask that shared caddie for information, such as what club the other player hit (Interpretation 10.2a/1).
• Someone gives you unsolicited advice → No penalty the first time, but you must try to stop them if they keep doing it. If you don't, it's treated as you asking for advice (Interpretation 10.2a/2).
• You use a self-standing putter → You can putt with it, but you (or your caddie) must not set it down in a standing position to show the line or help your stance — that breaches 10.2b(3) (Interpretation 10.2b/1).

Frequently asked questions

Can I look at a green-reading book before I putt?

Yes. Rule 10.2b doesn't stop you from reading a book or map. The restriction is on setting an object down to help you aim or take your stance.

What if I leave my green-reading book open on the green pointing at the hole?

That's setting an object down to help with aiming. Breach of Rule 10.2b(3) — general penalty (two strokes or loss of hole).

Can my caddie use a green-reading book to tell me the line?

Your caddie can give you directional help, but they can't set an object down to show the line, and they can't stand in a restricted area while you stroke. Reading from a book and telling you is allowed; propping the book up is not.

Does Rule 10.2b ban all green-reading materials?

No. Rule 10.2b doesn't mention green-reading materials at all. It bans setting objects down for alignment and restricts how caddies and others can help with line of play. Other rules (like Rule 4.3 or Model Local Rule G-11) may limit green-reading materials in certain competitions.

What's the penalty if I breach Rule 10.2b?

General penalty: two strokes in stroke play, loss of hole in match play. Each separate breach counts.