[Event "Olympiad-10 Preliminaries B"]
[Site "Helsinki"]
[Date "1952.08.14"]
[Round "4"]
[White "Morcken, Otto B"]
[Black "Souza Mendes, Joao"]
[Result "1/2-1/2"]
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Nf3 O-O 6. Bd3 Nc6 7. O-O d5 8. dxc5 dxc4 9. Bxc4 Bxc5 10. b3 a6 11. Bb2 b5 12. Bd3 Bb7 13. Ne4 Be7 14. Qb1 Nxe4 15. Bxe4 f5 16. Rd1 Qe8 17. Bd3 Nb4 18. a3 Nxd3 19. Qxd3 Qg6 20. Ne1 Bd5 21. Be5 Rac8 22. b4 Rfd8 23. Qe2 Rc4 24. Rac1 Rdc8 25. Qd2 a5 26. Rxc4 Rxc4 27. Bc3 axb4 28. Bxb4 Bf6 29. f3 Qe8 30. Nd3 Rc8 31. Nf4 Bb3 32. Rc1 Rd8 33. Qe1 e5 34. Ne2 Qd7 35. Ng3 g6 36. Ba5 Rc8 37. Rxc8+ Qxc8 38. Qc3 Qxc3 39. Bxc3 Kf7 40. Kf1 Ke6 41. e4 Bh4 42. exf5+ gxf5 43. Ke2 Bc4+ 44. Kd2 Bg5+ 45. Kd1 Bd3 46. Ne2 Kd5 47. Bb2 Be3 48. g3 h5 49. Ke1 Bh6 50. Kd1 Be3 51. Ke1 Bc4 52. Nc3+ Kd6 53. Ne2 Bd5 54. f4 exf4 55. Nxf4 Bf7 56. Ke2 Bg1 57. h3 Bc4+ 58. Kf3 1/2-1/2