FoxTrot by Bill Amend for October 19, 2000
Transcript:
Peter (oldest son): What are you doing? Paige (daughter): Dad talked me into playing chess with him tonight. It's been a while since I've done this, so I thought I'd get in some practice. Peter (oldest son): If you do that, you'll lose in six moves. Paige (daughter): See? I told you I was rusty. I used to be able to get out of these games in four moves.
4 moves is the minimum required for checkmate: https://en.wikipedia.org/wiki/Four-move_checkmate