Okay, say you sat down to chess. You play awhile, but then your partner starts playing it like checkers!
An outrage I know! Time to give him what for! Time to tell him…wait a second, if you play by the rules of checkers, you can beat him.
Let’s say for the time being that he wont change rules again – you play chess like checkers now, you can win. And maybe win fifty bucks.
So he says you won. You have fifty more bucks than before. Did you win at chess?