[Event "Hastings"] [Site "?"] [Round "0"] [White "Medina"] [Black "Lasker"] [Result "1-0"] [ECO "C70"] [Opening "Spanish: 4.Ba4"] 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Na5 10. Bc2 c5 11. d4 Qc7 12. Nbd2 Nd7 13. Nf1 Nb6 14. Ne3 f6 15. b3 Nc6 16. d5 Nd8 17. c4 b4 18. a4 Bd7 19. Nf5 Re8 {On the Queenside and in the centre the game is completely closed, and if there is still anything to be done, it must be on the Kingside. The position of Black's f-pawn gives White an opportunity to open the g-file} 20. g4 $1 Bf8 (20... g5 { To keep the g-file closed} 21. h4 {opening the h-file}) 21. Kh2 Nf7 22. Rg1 g6 {A critical moment. If the Knight retreats then Black plays ... Ph6. Then when White plays Ph5 Black replies ... Pg5} 23. g5 $1 {With this sacrifice White forces his plan through. Such a piece sacrifice is a favourite device for opening a file.} 23... Qd8 (23... gxf5 { Black can hardly afford to take the Knight} 24. gxf6+ Kh8 25. exf5 Bh6 (25... Qd8 26. Ng5 Qxf6 27. Qh5 Nxg5 28. Bxg5) 26. Bxh6 Nxh6 27. Rg7) 24. Qf1 $1 Kh8 ( 24... gxf5 25. gxf6+ Kh8 26. Qg2 Bh6 27. Bxh6 Rg8 28. Bg7+ Rxg7 29. Qxg7#) 25. Qg2 Ra7 26. Qg3 $1 Be7 27. Nxe7 Qxe7 28. Qh4 fxg5 {givning White a quick finish } (28... f5 29. exf5 Bxf5 30. Bxf5 gxf5 31. Qh5 {hopeless for Black}) 29. Nxg5 Nxg5 30. Bxg5 Qf7 31. Bf6+ Kg8 32. Rxg6+ {Violently opening the g-file} 32... Qxg6 33. Rg1 Qxg1+ 34. Kxg1 Kf7 35. Bd1 Rg8+ 36. Kh2 Ke8 37. Bh5+ Kf8 38. Bd8 1-0