There's a story doing the rounds about David Howell beating Nakamura in 10 moves in an online Blitz game.
It's on Simon Williams' twitter feed at
https://twitter.com/ginger_gm
It features the Cozio defence to the Spanish
Move 10 is the blunder, with 10. Qd5 and 10. e5 maintaining an edge for white according to engines.
11. g3 avoids the mate, but allows .. Nf3+ giving a +9 assessment to Black.