You win
Definition 1 of 2
Pro Tip 1/3Gaming Context
Use 'you win' when someone beats others in games or sports. 
After the final whistle, the coach said, 'Congratulations, you win!'
Pro Tip 2/3Unenthusiastic Response
Might sound insincere if not said with genuine enthusiasm. 
You win. Great job, I guess.
Pro Tip 3/3Acknowledging Skill
Suggests recognition of someone's superior ability or strategy. 
With that clever move, you win!