You choose the aggressive but risky 4. a3. The game continues 4. ... Bxc3+, 5. bxc3 O-O, 6. Nf3 b6, 7. Bg5 Bb7, 8. e3 d6, 9. Bd3 Nbd7, 10. Nd2 h6, 11. Bxf6 Nxf6, 12. f3 e5, 13. O-O Re8, 14. Re1 e4, 15. Bb1 exf3, 16. gxf3 Nh5, 17. Nf1 Qh4, 18. Bc2 Re6, 19. d5 Rf6, 20. Qe2 Re8, 21. Be4 Rxe4.

You stare at the board and slowly realise that this is the end. 22. fe is impossible because after 22. ... Rg6+, 23. Kh1 loses to 23. ... Qxe4+, and mate next move, while 23. Ng3 is met with 23. ... Nxg3, 24. hg Qxg3+, 25. Kh1 Qh3+, 26. Qh2 Qf3+, 27. Qg2 Qxg2 checkmate.

You resign and have to accept your forfeit, which ruins your life.

(Actual game was Hofstra, H - Ikonnikov, V. Source was www.chesslab.com which is a fantastic online resource.)