[Event "USSR Semi-Finals"] [Site "?"] [Round "0"] [White "Petrosian"] [Black "Khasin"] [Result "1-0"] [ECO "A05"] [Opening "Reti: 1...Nf6"] 1. Nf3 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. O-O O-O 6. d4 c6 7. Nc3 b6 { A typical position from the Catalan Opening. Black's formation is solid.} 8. Ne5 {White posts his knight in the center while unleashing the bishop along the h1-a8 diagonal.} 8... Bb7 9. e4 dxc4 { 9...dxe4 10.Nxe4 Nbd7 Now White can win a pawn.} 10. Nxc4 Ba6 11. b3 b5 12. Ne5 b4 13. Ne2 Bxe2 14. Qxe2 Qxd4 { Black has won a pawn but at the expense of not developing his queenside pieces. } 15. Bb2 Qb6 16. Rac1 {Although, a pawn down White stands better due to his more active pieces and control of the center.} 16... Rd8 17. Qf3 Qa6 18. Rfe1 { Notice how Black can't develop his queenside without losing material i.e. 18... Nbd7 19. Nxc6} 18... Rd2 19. Nc4 Rd8 20. Bf1 Qc8 21. Ne5 c5 22. Nxf7 { White breaks down Black's kingside defences.} 22... Kxf7 23. e5 Qc6 24. Qf4 g5 25. Qxg5 Rg8 26. Qf4 Rg4 27. Qe3 Re4 28. Qd3 Rxe1 29. exf6 { This leaves the Black king defenceless.} 29... Rxf1+ 30. Rxf1 Bf8 31. Rd1 { White prevents the Black queenside from developing with 31...Nd7.} 31... e5 32. Qxh7+ Kxf6 33. f4 {Black resigned.} 1-0