[Event "Groningen Netherland"] [Site "Groningen Netherland"] [Round "0"] [White "Szabo"] [Black "Kotov"] [Result "1-0"] [ECO "E10"] [Opening "Neo-Indian: 3.Nf3"] {The b1-h7 Diagonal} 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c5 5. e3 Nc6 6. a3 Be7 7. dxc5 Bxc5 8. b4 Bb6 9. Bb2 O-O 10. Be2 dxc4 11. Bxc4 Qe7 12. O-O a6 13. Qc2 Bc7 14. Ng5 $1 { This motif is typical of a tactical operation utilizing the b1-h7 diagonal} 14... Bxh2+ (14... h6 15. Nd5 {removing the guard of h7}) (14... Ne5) 15. Kh1 $1 (15. Kxh2 $2 Ng4+ 16. Kg3 Qxg5 $19) 15... h6 $2 (15... Be5 16. f4 Bxc3 17. Bxc3 g6 {This would repulse the attack along b1-h7 diagonal at the cost of increasing the dnagers on the other long diagonal}) 16. Nd5 exd5 17. Bxf6 Bf5 18. Qxf5 g6 19. Qxg6+ (19. Bxe7 gxf5 20. Bxf8 $18) 19... fxg6 20. Bxd5+ Rf7 21. Bxe7 hxg5 22. Kxh2 Nxe7 23. Bxf7+ Kxf7 24. Rac1 Nc6 25. Rfd1 Ke6 26. Rc5 Rh8+ 27. Kg3 Rh5 28. Rcd5 Ne7 29. Rxg5 Rh1 30. Re5+ 1-0