Probably the most instructive endgame position I ever played. I constructed what I thought was an impenetrable fortress. Luckily for me, my opponent thought so too.

It was an opposite colored bishops and rook endgame with pawns on both sides on the board. He had a pawn on the seventh rank and his rook was immediately adjacent to it, with my rook passively blocking the pawn. A rook trade would have led to an immediate draw with opposite colored bishops and no way for him to make progress.

There was a way for him to win. I thought I had safely prevented it. Again, he thought so too. I haven’t. He could have won easily.

III A Liga, Round 5
Lasic L. (2060) – Tomic S. (1942)
Reti vs London Setup

1. Nf3 d5 2. c4 c6 3. g3 Nf6 4. Bg2 Bf5 5. cxd5 cxd5 6. O-O Nc6 7. Qb3 Qd7 8. d4 e6 9. Nc3 Be7 10. Ne5 Qc8 11. Nxc6 bxc6 12. Bf4 O-O 13. Rac1 Nh5 14. Be3 Rb8 15. Qa4 Qd7 16. b3 Rb4 17. Qa5 Rfb8 18. Na4 Nf6 19. Qa6 Rc8 20. Nc5 Qc7 21. Bf4 Qd8 22. Rfd1 Rb6 23. Qa5 Rb5 24. Qxd8+ Rxd8 25. Nd3 Bxd3 26. Rxd3 Rc8 27. Rdc3 c5 28. a4 Ra5 29. Be3 Nd7 30. dxc5 Bf6 31. R3c2 d4 32. c6 dxe3 33. cxd7 exf2+ 34. Kxf2 Rd8 35. Rc8 Kf8 36. Bc6 Ra6 37. b4 Rb6 38. b5 Rb8 39. Rxb8 Rxb8 40. Be4 Rd8 41. Rc8 Ke7 42. Bc6 Bd4+ 43. Kf3 Bb6 44. Ke4 Kd6 45. Kd3 Kc5 46. Kc3 Ba5+ 47. Kb3 Kd4 48. e4 Kc5 49. h3 f6 50. g4 g5 51. Kc2 Kd4 52. Kb3 Kc5 53. Kb2 Kd4 54. Kc2 Bb6 55. Kd2 Ba5+ 56. Ke2 Bb6 57. Kf3 Ba5 58. Kg3 Bb6 59. h4 h6 60. h5 Ke3 61. Kh3

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