[Event "Zurich"] [Site "?"] [Round "0"] [White "Lasker"] [Black "Henneberger"] [Result "1-0"] [ECO "E21"] [Opening "Nimzo-Indian: Three Knights"] {Black tries to force his opponent into clearing up the central situation} 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 Bxc3+ 5. bxc3 d6 6. g3 O-O 7. Bg2 Qe7 8. Ba3 Nbd7 9. Nd2 e5 10. O-O Re8 11. e3 {We have now reached the Wyvill Formation. The conclusion reached there was that White ought to hold the pawn formation intact as long as possible, meanwhile building up his attack behind the lines, a strategy, which is similar to play of the previous exampe. Black for his part should try to force White to play Pd5} 11... c5 12. Rb1 Nb6 $2 {This is qu ite in accordance with the positional requirements outlined above, for Black will be able to play ... Be6 putting pressure on the White's c-pawn so as to induce him to advance Pd5. Nevertheless ... Rb8, or ... Pe4 would have been better, simply because White now gets the initiative} 13. dxc5 $1 dxc5 14. Rb5 {Defence of the c-pawn would now require ... Nfd7, after which Black would have great difficulty in completing his development. He therefore decides to let the pawn go} 14... Bd7 15. Bxc5 Qe6 16. Rb4 Bc6 17. Bxb6 Bxg2 18. Kxg2 axb6 {Although White is a pawn up the situation is far from clear, in view of the pawn weakensses in both camps} 19. Qc2 Red8 (19... e4) 20. f3 Rd6 21. Rf2 Rad8 22. Ne4 Nxe4 23. Qxe4 Qd7 24. Rbb2 (24. Qxe5 Re8 25. Qf4 Rf6 26. Qg5 h6 27. Qh4 Rxe3) 24... f6 25. c5 bxc5 26. Rxb7 Qe6 27. g4 {Prevents ... Pf5;} 27... Rd3 ( 27... Rd2 28. Ra7) 28. c4 g6 29. Rb8 $1 {Exchanging off a pair of Rooks} 29... Kg7 30. Rxd8 Rxd8 31. Rb2 Kh6 32. Kg3 Rd1 33. h4 Rg1+ 34. Kh2 Rd1 35. Kg3 Rg1+ 36. Rg2 f5 37. Qd5 Rxg2+ 38. Kxg2 Qa6 39. Qg8 Qxa2+ 40. Kg3 Qa7 41. Qf8+ 1-0