In the game Bogoljubov – Znosko-Borowsky, played in Westminster on 11 August 1922, White played 20. Bc4? and eventually lost.
He missed a not very difficult tactical sequence: 20. Nxf7! Rxf7 21. Qe6! Bf6 22. Rxd5! Bxd5 23. Bxd5 Qe8 24. Qxe8 Rxe8 25. Bf4! Kf8 26. Bxf7 Kxf7 27. Kf2! and White’s connected passed pawns should win.
If you found this you did better than one of the world’s strongest players from 100 years ago.
Here’s the complete game (click on any move for a pop-up window):