This is something that's always puzzled me in English.It is common where I live to say "I win!" if I win a game or beat someone at a game. If you win the game, "You win!", if you lose the game, "You lose." These are interesting in that they are present tense for something that has just happened.
You win -- present tense used to express something that's just happened, it contradicts the rules instilled into English sutdents' minds.
Is it the only tense option for winning/losing a game in the context described by Forero?
How about the perfect: You've won/You've lost? Is it used?