[Event "Biel"]
[Site "Biel"]
[Date "1980.??.??"]
[Round "?"]
[White "Shamkovich, Leonid"]
[Black "Wirthensohn, Heinz"]
[Result "1-0"]
[ECO "B83"]
[WhiteElo "2515"]
[BlackElo "2425"]
[SetUp "1"]
[FEN "8/3K4/1k6/3Q3p/7P/8/8/6q1 w - - 0 77"]
[PlyCount "47"]
[EventDate "1980.??.??"]
[Source "ChessBase"]
[SourceDate "1998.11.10"]

77. Qxh5 {White has just captured Black's h-pawn to bring about the kind of
endgame position which is very important in practical play. This position is a
theoretical draw. Black, understandably enough, is not sure how he should
proceed and therefore starts checking:} 77... Qg7+ 78. Ke6 Qg8+ 79. Ke7 Qg7+ $2
{#74 Black's previous two checks were O.K., but as if continuing by rote, this
check is a critical error, because it allows White to significantly improve
the position of his Queen.} ({Correct - and keeping the position drawn - are} 
79... Qg3 {and}) (79... Qc4 {
Both prevent White from significantly improving his Queen's position.}) 80. Qf7
$1 {From here the Queen shelters the King well, and by being more centrally
placed than on h5 it also covers more board room.} 80... Qg3 {#66 This is a
very important theoretical position, because it is won for White. Notice that
this conclusion comes while the h-pawn is still on its fourth rank. This is
the position that I submitted to BELLE for analysis, correctly calling it "won
for White."} (80... Qg1 {#73}) (80... Qg2 {#73}) 81. Qf6+ $1 Kc7 {#61} (81...
Ka7 {#65}) (81... Kb7 {#65}) 82. Qg5 $4 {Both Benko and Shamkovich credit this
with a ! mark when in fact it is quite ridiculous. From f6 the Queen has more
scope than on g5 and thus it should not be deactivated unless there is a
specific winning reason. In our case there is not.} ({Sufficient to keep the
position won are 82.Kf7, 82.Kf8 and 82.Ke8 . All of these moves free the e7
square for a potentially killing countercheck by White's Queen However,
strongest is the immediate} 82. h5 $1 {
BELLE then provides the following best play for both sides:} 82... Qa3+ 83. Kf7
Qa2+ 84. Kg7 Qg2+ 85. Qg6 Qb2+ 86. Kh7 Qb3 87. h6 Kd7 88. Qf5+ Kd8 89. Qf8+ Kd7
90. Kh8 Kc6 91. Qe8+ Kc5 92. Qe5+ Kc6 93. Kg7 Qb7+ 94. Kf6 Qb1 95. Qe8+ Kc5 96.
Qh5+ Kc4 97. h7 Qb6+ 98. Kg7 Qd4+ 99. Kh6 Qd6+ 100. Qg6 Qh2+ 101. Kg7 Qb2+ 102.
Qf6 Qg2+ 103. Kh6 Qh1+ 104. Kg6 Qg2+ 105. Qg5 Qc6+ 106. Kg7 Qd7+ 107. Kh6 Qh3+
108. Kg6 Qe6+ 109. Qf6 Qg4+ 110. Kf7 Qd7+ 111. Kg8 Qg4+ 112. Kf8 Qc8+ 113. Kg7
Qg4+ 114. Qg6 Qd4+ 115. Kf8 Qd8+ 116. Qe8 Qd6+ 117. Qe7 Qh6+ 118. Ke8 Qc6+ 119.
Qd7 Qa8+ 120. Ke7 Qa3+ 121. Kd8 Qf8+ 122. Kc7 Qh8 123. Qf5 Kb3 124. Kd7 Qd4+
125. Ke7 Qc3 126. Qe6+ Kc2 127. Kf7 Qc7+ 128. Kg6 Qg3+ 129. Kf6 Qc3+ 130. Kg5
Qg3+ 131. Qg4 Qe3+ 132. Kf6 Qb6+ 133. Qe6 Qd4+ 134. Kg6 Kd1 135. Kf7 Qa7+ 136.
Qe7 Qd4 137. Qc7 Qd5+ 138. Ke8 Qe4+ 139. Qe7 Qg6+ 140. Kd8 Qb6+ 141. Qc7 Qf6+
142. Kc8 Qa6+ 143. Qb7 Qc4+ 144. Kd8 Qh4+ 145. Qe7 Qh5 146. Kc8 Kc2 147. Kb8
Qh3 148. Qg7 Qb3+ 149. Qb7 Qh3 150. Qc8+) 82... Qa3+ 83. Kf7 Qb3+ 84. Kg7 Qc3+
85. Qf6 Qg3+ 86. Kh7 Qh3 87. Qg5 Kb6 88. h5 Qd7+ 89. Qg7 Qh3 90. Qe5 Qd7+ 91.
Kg6 Qd3+ 92. Qf5 Qg3+ 93. Kf7 Qc7+ 94. Kg8 Qb8+ 95. Kg7 Qc7+ 96. Qf7 Qh2 97. h6
Ka5 98. h7 Qe5+ 99. Qf6 Qg3+ 100. Kh6 1-0

[Event "USA-ch"]
[Site "New York"]
[Date "1962.12.16"]
[Round "1"]
[White "Fischer, Robert James"]
[Black "Mednis, Edmar John"]
[Result "0-1"]
[ECO "C18"]
[PlyCount "145"]
[EventDate "1962.12.16"]
[Source "ChessBase"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Qc7 7. Nf3 Bd7 8. a4
Ne7 9. Bd3 Nbc6 10. O-O c4 11. Be2 f6 12. Ba3 O-O 13. Re1 Rf7 14. exf6 gxf6 15.
Bf1 Re8 16. Nh4 Ng6 17. Qh5 Rg7 18. g3 Qa5 19. Bb2 Nd8 20. Re3 Nf7 21. Kh1 Nd6
22. Nxg6 hxg6 23. Qe2 Rh7 24. Kg1 Kf7 25. h4 f5 26. Qf3 Ne4 27. Qf4 Rc8 28. Bg2
Qc7 29. Qxc7 Rxc7 30. a5 Rc6 31. Ba3 Ra6 32. Bb4 Rh8 33. Ree1 Bc6 34. Bf3 Nd2
35. Be2 Ne4 36. Kg2 Nf6 37. Rh1 Be8 38. Kf3 Ne4 39. Ke3 Nf6 40. f3 Bd7 41. g4
Be8 42. Kf4 Bb5 43. h5 gxh5 44. Rag1 Be8 45. Ke3 b6 46. axb6 Rxb6 47. Ra1 Rb7
48. Bd6 Rh7 49. gxf5 exf5 50. Rh4 Ke6 51. Bh2 Rb2 52. Kd2 Rhb7 53. Kc1 R2b6 54.
Bf1 Ng8 55. Bf4 a5 56. Rh2 a4 57. Bh3 Ne7 58. Bg5 Kf7 59. Re2 Re6 60. Rxe6 Kxe6
61. Kd1 Nc8 62. Kd2 Bd7 63. Bg2 Ra7 64. Re1+ Kd6 65. Bh6 a3 66. Bf8+ Kc6 67.
Bc5 Ra8 68. Ra1 a2 69. Ke3 Nd6 70. Kf4 Nb5 71. Bb4 h4 72. Bh3 Nc7 73. Be7 0-1

