[Event "Dubrovnik olm"]
[Site "Dubrovnik YUG"]
[Date "1950.08.30"]
[Round "8"]
[White "Larry Melvyn Evans"]
[Black "Haakon Opsahl"]
[Result "1-0"]
[ECO "D51"]
[Annotator "RCA"]
[PlyCount "169"]
[EventDate "1950.??.??"]

{[%evp 0,169,32,28,27,4,17,10,10,-10,20,6,27,0,35,31,31,24,37,35,45,43,50,39,
40,39,45,33,33,3,2,5,5,2,10,0,50,50,59,50,45,58,60,88,80,54,45,45,63,67,58,58,
68,55,49,49,49,33,29,24,50,51,55,43,41,30,31,31,30,30,30,30,24,24,24,24,24,0,
30,27,27,27,27,27,27,27,27,27,27,27,27,27,91,79,90,88,138,138,138,138,138,138,
138,138,138,138,138,138,138,138,138,138,138,129,129,129,148,148,148,148,148,
133,154,148,148,154,154,154,154,154,154,154,154,154,193,193,193,193,201,196,
200,200,220,244,244,382,476,482,490,603,627,643,738,746,864,992,1000,864,992,
1000,1014,1014,1022,1022,1022,1022,1032,1032,1306,1389,1522,1950]} 1. d4 Nf6 2.
c4 e6 3. Nc3 d5 4. Bg5 Nbd7 5. e3 (5. cxd5 {1. Beware of Famous Opening Traps}
exd5 6. Nxd5 Nxd5 $3 7. Bxd8 Bb4+ 8. Qd2 Kxd8 9. Qxb4 Nxb4) 5... Be7 6. Qc2 O-O
7. cxd5 exd5 8. Nf3 c6 9. Bd3 Re8 {2. Play where your central pawn chain
points.} 10. O-O Nf8 11. Rab1 {3. Minority attack} Ne4 12. Bxe7 (12. Bf4 {
4. When you lack space, trade pieces.}) 12... Qxe7 13. b4 a6 14. a4 Nxc3 {
5. To take is a mistake} 15. Qxc3 Bg4 16. Nd2 {6. Keep your pawn chain
connected.} (16. b5 Bxf3 17. gxf3 Qg5+ 18. Kh1 Qh5 19. Kg2 axb5 20. axb5 Re6) (
16. Ne5 Bh5) 16... Qg5 {7. Bring your Queen for the king's attack.} 17. Rfc1 (
17. b5 Bh3 $1 18. g3 Bxf1) 17... Re6 {8. Rook lift} 18. b5 axb5 19. axb5 Bh3 (
19... cxb5 20. Rxb5) 20. g3 Rae8 21. bxc6 bxc6 22. Bf1 $1 {9. Eliminate
opponent's pieces on your side of the board.} (22. Rb6 Rxe3 $1 23. fxe3 Qxe3+
24. Kh1 Qf2) 22... Bxf1 23. Nxf1 Ng6 24. Rb6 {Attack weak pawns.} Ne7 25. Qb4
h5 {Preparing an escape square, and countering the back-rank checkmate.} 26.
Rb8 {10. Trading Pieces to Emphasize a Weakness (here c6 pawn)} Rxb8 27. Qxb8+
Kh7 28. Qf4 Qxf4 29. gxf4 {11. capture towards the center} g6 30. Nd2 {12.
least active piece} Rd6 31. Kf1 {13. In an endgame, activate your king. It's
as strong as a knight.} Kg7 32. Ra1 Rd7 33. Nb3 Rb7 34. Nc5 {14. An outpost.
An advanced position, protected by the pawn.} Rb2 35. Ra7 {15. Rooks are great
on the 7th rank.} Kf6 36. Ra6 Rb1+ 37. Kg2 Rb2 38. Ra7 Rb1 39. Rc7 Ra1 40. Nd3
Ke6 41. Nc5+ {16. A Knight's Tour - A strategic maneuver where a piece is
moved through a long sequence of forcing moves (checks and threats) to
accomplish a specific, often quiet, positional goal.} Kf6 (41... Kd6 42. Rd7#)
42. Nd7+ Ke6 43. Nf8+ Kf6 (43... Kd6 44. Rd7#) 44. Nh7+ Ke6 45. Ng5+ Kd6 46.
Rb7 f6 47. Nh7 $1 {17. In an endgame, attack pawns, not the king.} Ke6 48. Nf8+
Kf7 (48... Kd6 49. Rd7#) 49. Nxg6 {Pin+Deflection} Kxg6 50. Rxe7 {18. Strong
VS weak pawn structure (pawn islands).} Kf5 51. Rc7 Rc1 52. Rc8 Kg6 53. Kg3 Rc2
54. h4 Kf5 55. Rh8 Kg6 56. f5+ $1 {19. A passed pawn wins endgames.} Kxf5 57.
Rxh5+ Kg6 58. Rh8 Kf5 59. Rg8 {20. Cutting Off the Opponent's King- an
important endgame rule} Rc1 {Always ask "what does he want?"} 60. Kg2 Ra1 61.
h5 Ra7 62. Rg3 {21. Rooks Go Behind Passed Pawns} Rh7 63. Rh3 Kg5 64. Kf3 {
22. An outside passed pawn.} Rh6 (64... Rxh5 65. Rxh5+ Kxh5 66. Kf4 Kg6 67. Kg4
f5+ 68. Kf4 Kf6 69. f3 {Waiting Move / Zugzwang} Ke6 70. Kg5 Ke7 71. Kxf5) 65.
Rh1 Kf5 66. Kg3 Kg5 67. Rh4 (67. f4+ {is a mistake} Kf5 {and e3 is a weak pawn
now}) 67... Kf5 68. Rf4+ Kg5 69. Rg4+ Kf5 (69... Kxh5 70. Rh4+) 70. Kh4 Rh8 71.
Rg7 Ra8 72. h6 Ra1 73. Rg3 {23. Building a Bridge (Rook Technique)} (73. h7
Rh1+ 74. Kg3) 73... Rh1+ 74. Rh3 Rg1 75. Rf3+ (75. h7 Rg4+ 76. Kh5 Rg5+ 77. Kh6
Rg6+ 78. Kh5 Rg5+ {Perpetual check}) 75... Kg6 {only move} (75... Ke6 76. h7)
76. Rg3+ Rxg3 77. Kxg3 Kxh6 78. Kg4 Kg6 79. Kf4 {24. Zugzwang} Kg7 (79... f5
80. Ke5 Kg5 81. f3 Kg6 82. f4 Kf7 83. Kxf5) 80. Kf5 Kf7 81. f3 {25. Opposition
(Black resigned here)} Ke7 82. Kg6 Ke6 83. f4 Ke7 84. f5 Kf8 85. Kxf6 1-0

