Lesson
White to move. Main line: 1. c4 e6 2. e3 Nf6 3. Nf3 b6 4. Be2 Bb7 5. O-O d5 6. d4 Bd6 7. Nc3 O-O 8. b3 Nbd7 9. Bb2 Qe7 10. Nb5 Ne4 11. Nxd6 cxd6 12. Nd2 Ndf6 13. f3 Nxd2 14. Qxd2 dxc4 15. Bxc4 d5 16. Bd3 Rfc8 17. Rae1 Rc7 18. e4 Rac8 19. e5 Ne8 20. f4 g6 21. Re3 f5 22. exf6 Nxf6 23. f5 Ne4 24. Bxe4 dxe4 25. fxg6 Rc2 26. gxh7+ Kh8 27. d5+ e5 28. Qb4 R8c5 29. Rf8+ Kxh7 30. Qxe4+ Kg7 31. Bxe5+ Kxf8 32. Bg7+ Kg8 33. Qxe7
Zukertort centralizes first: the rooks occupy the e-file, the bishop reaches b2 and the pawns advance to e5 and f4. Black’s 21...f5 closes one line but allows 22.exf6 and 23.f5, opening new routes toward the king.
The key sequence begins with 25.fxg6 and 26.gxh7+. After 27.d5+, the b2-bishop joins the attack along the long diagonal. The spectacular 28.Qb4! and 29.Rf8+ leave Black unable to meet every threat, even though the white queen can be taken later.
The instructional point is accumulation: no single early move wins. Space, open lines and piece placement reinforce one another until forcing play becomes possible. Replaying the whole score reveals why the final sacrifice is calculation, not decoration.