[Event "Hilversum"] [Site "?"] [Round "0"] [White "Kramer"] [Black "Van Doesburg"] [Result "1/2-1/2"] [ECO "C67"] [Opening "Spanish: Open Berlin"] {Combinative Defence} 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. d4 Be7 6. dxe5 O-O 7. Qe2 d5 8. exd6 Nxd6 9. Bxc6 bxc6 10. Be3 Bf6 11. c3 Re8 12. Rd1 Qe7 13. Nbd2 Nf5 14. Nf1 a5 15. Qc2 Nxe3 16. Nxe3 Qc5 17. Re1 Be6 {The Whte K s will be hard pressed to hold their own against Black's far-ranging Bishops. Since Black is threatening further progress by ... Pa4-a3, White goes in for the following combinative liquidation} 18. Nd4 $1 (18. -- a4) 18... Bxd4 19. cxd4 Qxd4 20. Qxc6 Qxb2 21. Nd5 { Black was threatening to gain a powerful outside passed pawn by 21. ... Bxa2} ( 21. -- Bxa2) 21... Rac8 22. Nxc7 $1 {The clever point of the defence. Now no matter what Black tries he cannot prevent the Knight from escaping or White obtaining fully compensation by tactical means} 22... Re7 (22... Red8 23. Nxe6 Rxc6 24. Nxd8 Re6 25. Nxe6) (22... Qb8 23. Rec1 Red8 24. Rab1 Qa7 25. Nb5 $1 Rxc6 26. Nxa7 Rxc1+ 27. Rxc1 Bxa2 28. Nc6 Rc8 (28... Ra8 29. Nxa5) 29. Ne7+ $18 ) 23. Nd5 $1 Rxc6 24. Nxe7+ Kf8 25. Nxc6 Bxa2 26. Nxa5 g6 27. Rac1 1/2-1/2