[Event "Leiden"]
[Site "Leiden"]
[Date "1970.05.??"]
[Round "4"]
[White "Botvinnik, Mikhail"]
[Black "Larsen, Bent"]
[Result "0-1"]

1. c4 f5 2. d4 Nf6 3. g3 e6 4. Bg2 Bb4+ 5. Nd2 O-O 6. Nf3 a5 7. O-O b6 8. Ne5 Ra7 9. Nd3 Bb7 10. Nf3 Be7 11. b3 Ne4 12. Bb2 Bf6 13. a3 c5 14. e3 Nc6 15. Nfe5 cxd4 16. exd4 Nxe5 17. dxe5 Be7 18. a4 Qc7 19. Qc2 Bc6 20. f3 Nc5 21. Nf4 Bg5 22. Ne2 Be3+ 23. Kh1 f4 24. Nd4 fxg3 25. Nxc6 dxc6 26. hxg3 Qf7 27. Bh3 Rd8 28. Bc3 Rad7 29. Ra2 Rd3 30. b4 axb4 31. Bxb4 Qh5 32. Qh2 Qxe5 33. f4 Qe4+ 34. Qg2 Qxc4 35. Bxc5 Bxc5 36. Qxc6 Re3 37. Raf2 Kh8 38. Qg2 h6 39. Bg4 Qxa4 40. Re2 e5 41. Ra2 Qc4 42. Rc2 Qb4 43. Bf5 exf4 44. gxf4 Re1 45. Re2 Rxf1+ 46. Qxf1 Rf8 47. Be4 Qd4 48. Kg2 Qf6 49. f5 Qg5+ 50. Kh1 Qh4+ 51. Kg2 Rd8 52. Bc2 Rd4 0-1