An uncountable number of games use the term "win condition" and clash royale didn't invent it, and before you tell me I don't know what I'm talking about my username is a clash royale reference
Oh wow who could’ve guessed, the so-called win condition is, surprisingly, something that is very useful to win, like a win condition in pretty much any other game.
Write down a sequence to checkmate from the current position, grab the pieces and move them to that position, call the arbiter and say the opponent just didn’t notate the last few moves
Frame your opponent for your assassination, then visit him in prison under a fake name, with a fake moustache, whisper "checkmate", and leave while your opponent rants to the uncaring guards that you're the man he's supposed to have murdered.
Eat the chess board