All those rules have been around a long time now, they just get redone a bit now and then, added to, deleted from and so on. I have taught most of them them in training classes and posted most of them them on the net myself in the past, they are fun to teach. Yet, there is a more important rule than all of those combined.
The most important rule I ever heard and, it includes gunfights, is that you go home that night to kiss your kids (or loved one) goodnight. If you made it that far, well I guess you were the winner.
Be careful out there.
All the best,
Glenn B