Russian champion Alexander Petrov composed this study in 1824. Galloping Cossacks chase Napoleon from Moscow (b1) across the Berezina (the long white diagonal) to Paris (h8), “where the Czar achieves his victory, by a ‘check by discovery’.”

White’s knights accomplish the task in 14 moves. All the black king’s moves are forced:

1. Nd2+ 2. Nc3+ 3. Nb1+ 4. Na2+ 5. Na3+ 6. Nb4+ 7. Nb5+ 8. Na6+ 9. Na7+ 10. Nb8+ 11. Nc8+ 12. Nd7+ 13. Ne7+ 14. Kg2#