[Event "Dubrovnik"] [Site "?"] [Round "0"] [White "O'Kelly"] [Black "Najdorf"] [Result "0-1"] [FEN "r1q1r1k1/1ppb1pb1/3p1np1/1NnN3p/p1P1P3/4B1PP/PPQ2PBK/R2R4 b - - 0 1"] {Knight with support point against bishop without support point With this last move Nd4-b2, White gave his opponent the opportunity for the following transaction} 1... Nxd5 2. exd5 Bxb5 3. cxb5 a3 4. Bd4 (4. Bxc5 axb2 5. Rab1 dxc5 6. Qxc5 Rxa2 $17) 4... Bxd4 5. Rxd4 axb2 6. Qxb2 b6 {Now Black has a beautifully posted knight against a bad Bishop - a decisive advantage. From now on there is little White can do.} 7. Rd2 Qf5 8. Re2 Nd3 {This Knight has no intention of abadoning his strong point for good. With this foray, Blac achieves maximum activity for his other pieces} 9. Rxe8+ Rxe8 10. Qc2 Qe5 11. Rd1 Nc5 {Now it becomes clear: Black threatens to invade the seventh rank, and also start a direct attack by 12. ... h4} 12. h4 Qe2 13. Qd2 (13. Qxe2 Rxe2 14. f3 Rxa2 $17) 13... Qxb5 14. Re1 Rxe1 15. Qxe1 Qb2 16. f4 (16. Qe8+ Kg7 17. Qc8 Qxf2 18. Qxc7 Ne4 {It is remark able how this powerfully posted Knight influences the whole battlefield}) 16... Kf8 17. f5 Qe5 18. Qf1 Qxf5 19. Qxf5 gxf5 20. Bf3 Ne4 21. Bxh5 Nc3 22. Bf3 Nxa2 0-1