[Event "Munich Olympiad"] [Site "?"] [Round "0"] [White "Uhlmann"] [Black "Botvinnik"] [Result "0-1"] [ECO "A40"] [Opening "Queen's Pawn: 1...e6 2.c4"] 1. d4 e6 2. c4 Nf6 3. Nc3 Bb4 4. e3 b6 5. Bd3 Bb7 6. Nf3 Ne4 7. O-O f5 { The game has switched from a Nimzoindian to a Dutch Defense.} 8. Qc2 Bxc3 9. bxc3 O-O 10. Rb1 c5 {This prevents White from advancing his pawn, but at the same time it weakens the pawn structure on the queenside and White now puts some pressure there.} 11. a4 Qc7 12. a5 d6 13. Nd2 Nxd2 14. Bxd2 Nd7 15. Rb2 bxa5 16. Ra1 Nb6 17. Rxa5 {Otherwise Black would have advanced the pawn to a4. But now Black takes the initiative with a powerful pawn sacrifice.} 17... Be4 18. Bxe4 fxe4 19. Qb3 { The pawn could not be accepted. 19.Qxe4 Nxc4 20.Qxe6+ Qf7} 19... Nxc4 20. Qxc4 Qxa5 21. Qxe6+ Kh8 22. Ra2 Qc7 23. Qxe4 {After a series of moves which were pretty-much forced, the picture has become much clearer. Black has a material advantage (the exchange for a pawn) but more importantly, there is a strong double attack which wins the game.} 23... Qf7 0-1