Golf's Rule 22 Applies to Foursomes (Alternate Shot)

In the Official Rules of Golf, jointly written and maintained by the United States Golf Association and the Royal and Ancient Golf Club of St. Andrews, Rule 22 is titled "Foursomes (Also Known as Alternate Shot)."

The purpose of the rule, as excerpted from the rule book, is this:

Rule 22 covers Foursomes (played either in match play or stroke play), where two partners compete together as a side by alternating in making strokes at a single ball. The Rules for this form of play are essentially the same as for individual play, except for requiring the partners to alternate in teeing off to start a hole and to play out each hole with alternate shots.

It is the responsibility of golfers to know the rules, and the USGA and R&A have tons of resources on their respective websites to help us learn and understand. These are links directly to the text of Rule 22 that is found on the governing bodies' websites:

Summarizing Rule 22: Foursomes

In our Quick Intro to the Rules of Golf, we summarize Rule 22 as follows:

Partners play alternately at one ball. If you play out of turn you lose the hole in match play (or incur two penalty strokes in stroke play). Penalties do not alter the order of play.

There are five sections within Rule 22. These are the titles for each of those sections, plus links into that specific section of the rule:

The condensed Player's Edition of the rule book summarizes the format this way:

A form of match playMatch Play: A form of play where you or your side plays directly against an opponent or opposing side in a head-to-head match of one or more rounds. or stroke play where you and a partner compete as a side by playing one ball in alternating order on each hole. You and your partner must alternate in teeing off to start each hole.
Any penalty strokes do not change which of you or your partner must play the next stroke.

Be sure to read the full Rule 22, interpretations of Rule 22, and definitions of important terms either on USGA.org or RandA.org.