[Event "Leningrad"] [Site "?"] [Round "0"] [White "Spassky"] [Black "Aftonov"] [Result "1-0"] [ECO "D25"] [Opening "QGA: 4.e3 c5"] 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 c5 5. Bxc4 e6 6. O-O a6 7. Qe2 b5 8. Bb3 Nc6 9. Nc3 cxd4 {This is a positional mistake, because the isolated pawn which it creates will be able to quickly satisfy its lust to expand. Better was 9... c4.} 10. Rd1 Bb7 11. exd4 Nb4 {Black is obeying a classical principle of establishing a blockade in front of the isolated pawn. But thanks to the pin on the e- file, White has a resource.} 12. d5 Nbxd5 13. Bg5 {Black's position is a virtual pin-cushion (Bg5 on Nf6, Qe2 on Pe6, and Rd1 on Nd5). The simple threat is 14.Nxd5 Bxd5 15.Bxd5, since 15...Qxd5 loses to 16. Rxd5.} 13... Be7 14. Bxf6 gxf6 {14...Bxf6 15.Nxd5 Bxd5 16.Bxd5 Qxd5 17.Rxd5} 15. Nxd5 Bxd5 { 15...exd5 16.Nd4 would have also led to a crushing position for White.} 16. Bxd5 exd5 17. Nd4 {This position can already be considered winning, because of the weakness of Black's pawn structure and the strong position of the Nd4. The simple threat is Rd1-e1 and Nd4-c6.} 17... Kf8 18. Nf5 h5 {Otherwise Whit e would have delivered a nasty check at h6. Now the overworked Black queen is deftly exploited to bring a rapid conclusion to the game.} 19. Rxd5 Qxd5 20. Qxe7+ Kg8 21. Qxf6 1-0