The problem with unwritten rules is, well, they’re unwritten. What is obvious for some needs to be spelled out for others, and without fine print things tend to go sideways. All of which is to say, you can’t blame Bryson DeChambeau on this one.

Saturday's third round had seen McIlroy surge into the lead with DeChambeau hot on his tail just two shots back after three birdies in his final five holes. That late push put Bry