How Do You Checkmate with a King?

Did you ever get the Achievement 'Killer King'? Probably not as only some GMs have it. You might be thinking- "Pfffft, you can't checkmate with a King" Well prepare to be amazed:

Black's King moves out of the way revealing a discovered Checkmate on White and since the King was the last to move before the game ended, the King technically just Checkmated their opponent. Go to GM Hikaru Nakamura's Profile to see this Achievement in action.