The Open Championship playoff rules could bring extra holes at Royal Birkdale's British Open

Cameron Young finished about two hours before the golfers who entered Sunday at The Open Championship as leaders.He posted a 64, though, putting him at 9-under and allowing him to wait and see whether he'd have anyone join him in a playoff.That raises the question, of course: How will a playoff work at the British Open at Royal Birkdale?Here's what you need to know.How many holes is The Open Championship playoff?The Open Championship plays a three-hole playoff.They will go to Nos. 14, 15 and 18.No matter what, they play all three holes.How does The Open Championship playoff work?The playoff at Royal Birkdale is a three-hole, aggregate-score playoff.That means that whichever golfers are tied after 72 holes play three more holes. Their combined score from those three holes is compared, and w