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Thanh Nha Duong vs Alex Yermolinsky
Canadian Open (2007), Ottawa CAN, rd 10, Jul-15
Neo-Grünfeld Defense: Classical Variation. Modern Defense (D78)  ·  0-1

ANALYSIS [x]

FEN COPIED

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Given 7 times; par: 246 [what's this?]

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Kibitzer's Corner
Jan-24-08  Fast Gun: Quite an unusual for a rook & pawn ending to last for nearly eighty moves, it did seem to me as though black made hard work of winning this game!!
Nov-06-10  Whitehat1963: Good Lord!
Jul-16-13  Sem: A world of its own.
Aug-19-19
Premium Chessgames Member
  g15713: E. 1
White to move. Last: 36...Rxd5


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Normally this rook ending, 4 pawns against 3 pawns on the same side of the board, is considered drawish.

Game continuation:

37. Rc2 g5 38. Re2 e6 39. Rb2 Kg7 40. Ra2 h5 41. h3 Kg6 42. Re2 Rd4 43. Kf2 Kf6 44. Kg2 Ke7 45. Ra2 e5 46. Kf2 g4 47. hxg4 hxg4 48. fxg4 Rxg4

E. 1.1
White to move. Last: 48...Rxg4


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The rook ending has now transformed to 2 pawns against 1 pawn.

FinalGen considers the position as a draw.

John Emms in his marvelous 2008 chess book, The Survival Guide to Rook Endings, remarks about e- and f-pawns vs g-pawn on page 59 as follows:

<"This formation gives the attacking side even more winning chances than the one just discussed,"> f- and g-pawns vs h-pawn <"as the attacking king has another file he can use for infiltration. In my database, in endgames with the structure e5/f4 vs g6 (or any mirror image) the attacking side scored an impressive 64% of wins.">

Game continuation:

49. Ra6 Rd4 50. Kf3 f5 51. Ke3 Rd6 52. Ra5 Kf6 53. Rb5 Ra6 54. Rb8 Ra3+ 55. Kf2 Ke6 56. Rb5 Ra2+ 57. Kf1 Rc2 58. Ra5 Kd6 59. Rb5 Rc5 60. Rb3 Rc2 61. Rb5 Ra2 62. Kg1 Ke6 63. Kf1 Kf6 64. Rb8 Ke7 65. Rb6 Rd2 66. Ra6 Rd6 67. Ra5 Kf6 68. Ke2 Rc6 69. Rb5 Rc2+ 70. Kf1 Ke6 71. Ra5 Kd6 72. Rb5

E. 1.2
Three-time repetition claimable, Black to move Last: 72.Rb5


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<"With the e-pawn on its fourth rank, the defending rook should be on its third rank, to prevent the enemy rook from using this rank"> Muller

Game continuation:

72...Rc5 73. Rb3 Kd5 74. Ke2 Rc2+ 75. Ke3 Kc4 76. Rb8 Rc3+ 77. Kf2 Kd3 78. Rd8+ Ke4 79. Rd2 Rf3+ 80. Kg2 Ke3 81. Ra2 e4 82. Ra3+ Ke2 83. Ra2+ Ke1 84. Ra1+ Kd2 85. Ra2+ Kd1 86. Ra1+ Kc2 87. Ra5 Kd2 88. Ra2+ Kc1 89. Ra5 Kc2 90. Ra2+ Kb3 91. Ra8 Kc4 92. Ra4+ Kd5 93. Ra5+ Ke6 94. Ra6+ Ke5 95. Ra5+ Kf6 96. Ra8 Rc3 97. Kf2 Rc2+ 98. Kf1 Rb2 99. Ra7 Rb6 100. Kf2 Kg5 101. Rg7+ Rg6 102. Rh7 Rd6 103. Rg7+ Kf6 104. Ra7 Rd2+ 105. Kf1 Ke5

E. 1.3
White to move Last: 105...Ke5


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White played 106. Ra4? which lost to 106...e3

White cannot allow the Black e-pawn to advance to its 6th rank without hinderance

According to FinalGen White can draw with either 106. Ra3 or Ra5+

Also 106. Re7+ draws as 106...Kd4 107. Rf7 Kd3 108. Rxf5 = Shredder

Unique drawing line might have been:

106. Ra3 Rd3 107. Ra5+ Kf6 108. Ra6+ Kg5 109. Kg2 Kg4 110. Rg6+ Kh5 111. Rg8 Rd2+ 112. Kh3 e3 113. Re8 e2 114. g4+! fxg4+ 115. Kg3 Kg5 116. Rxe2 Rxe2 Stalemate!


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