Ultimately, even the air-tight rubric of an expertly crafted acronym can’t be universal. The rules of the restaurant world are not black and white: They’re more like a mashed potato cream color, with specks of brown, crispy skin tossed in to make things more exciting… even if they get stuck in your teeth sometimes. But that’s why we have toothpicks!
The only true, mature way to tackle the check — and actually, most adult problems involving other humans and money — is a healthy spirit of compromise: the utilitarian toothpick of adult problems. This willingness to be malleable is far more mature than any half-baked stance you have on splitting. So use these rules as a general guideline, a primer. They are not doctrine. Your focus should rest on being open, being considerate, and thinking outside of yourself… even if it’s just for one meal.