Quote:
In heads up (no limit holdem?), every time you play a hand differently from the way you would have played it if you could see all your opponents' cards, they gain; and every time you play your hand the same way you would have played it if you could see all their cards, they lose.
Is it really a mathematical theorem, or is the word "theorem" used in an informal sense? I couldn't find any proof or even a formal statement of it. Is there any of those?