Victor Korchnoi, 75, still wins chess tournaments. See http://www.chessbase.com/newsdetail.asp?newsid=3329 where you can replay his games from the Banyoles Festival, including this Gruenfeld that demonstrated that two center pawns backed by two bishops are no match for a queenside pawn majority.
[Event "Banyoles 2006"]
[Site "?"]
[Date "2006.08.17"]
[Round "1.2"]
[White "Vigo, David"]
[Black "Korchnoi, Viktor"]
[Result "0-1"]
[PlyCount "84"]
[EventDate "2006.08.22"]
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 c5 8.
Be3 Qa5 9. Qd2 Nc6 10. Ne2 O-O 11. Rd1 cxd4 12. cxd4 Qxd2+ 13. Rxd2 Na5 14. Bd3
Bd7 15. O-O Rfc8 16. Rb1 e6 17. Rdd1 Bf8 18. f3 Ba4 19. Rdc1 h5 20. Bd2 Rxc1+
21. Rxc1 Nc6 22. Be3 Nb4 23. Bb1 Bc6 24. Nf4 Rd8 25. Kf2 Bb5 26. Ne2 Bg7 27.
Rd1 Bc4 28. Rd2 b5 29. d5 exd5 30. Bxa7 Ra8 31. Bc5 Nxa2 32. Bxa2 Rxa2 33. Rxa2
Bxa2 34. Nd4 b4 35. Ke3 Bf8 36. Bxf8 Kxf8 37. Kd2 dxe4 38. fxe4 Bb1 39. e5 Be4
40. g3 Ke7 41. Ke3 Bd5 42. Kd3 f6 0-1