[Event "ch-USA 2020"] [Site "lichess.org INT"] [Date "2020.10.26"] [Round "2.1"] [White "Nakamura, Hi"] [Black "Lenderman, A.."] [Result "1/2-1/2"] [Annotator "Jacob Aagard"] [ECO "B10"] [WhiteElo "2736"] [BlackElo "2634"] [SetUp "1"] [FEN "8/7r/3k4/8/8/7K/4R1P1/8 w - - 0 51"] [PlyCount "188"] [GameId "2188640117440233"] [EventDate "2020.10.26"] [EventType "tourn (rapid)"] [EventRounds "11"] [EventCategory "17"] [SourceTitle "Conceptual Rook Endgames"] [Source "Mark Crowther"] [SourceDate "2020.10.26"] [SourceVersion "2"] [SourceVersionDate "2020.10.27"] [SourceQuality "2"] {[#]} 51. Kg4 {How should Black continue?} Rg7+ $2 {An understandable mistake, but an instructive one.} (51... Rh8 $1 {This was the only drawing move. You can explain with variations- and I shall- but dont lose sight of the reason why this is working.It extends the checking distance.} 52. Kf5 Rf8+ 53. Kg6 (53. Kg5 Rg8+ 54. Kf6 Rf8+ 55. Kg7 Rf4 56. Kg6 Rf8 57. Ra2 Ke5 $1 $11) 53... Kd5 $3 {also an important move.The idea is to avoid Re6+ followed by Rg6} 54. Kg7 (54. Ra2 {would allow the Black king closer} Ke5 $1 {Black simply draws.}) 54... Rf4 $1 {preventing the g-pawn from advancing.} 55. Kg6 Rf8 $1 {Black holds.}) (51... Kd5 52. Kf5 Rf7+ 53. Kg5 Rg7+ (53... Rf8) 54. Kf6) 52. Kf5 Rg3 $6 {Not the strongest defence} (52... Rf7+ 53. Kg5 $1 {White can zigzag between threats of advancing the g-pawn and checking the black king away to the far queenside.The technique is important to understand, so you can use it in your own games.} (53. Kg6 Rf8 $1 54. Ra2 Ke5 $1 $11 {This same method would not have worked if White had his king on g5 is an important point to note- Kidambi}) 53... Rf8 54. Ra2 $1 Rg8+ (54... Ke6 55. Ra6+ Ke7 56. Ra7+ Ke6 57. Rg7 $1 {This is the key idea behind 54.Ra2}) (54... Ke5 55. Ra5+ Ke4 56. Ra4+ $1 Kd5 57. g4 $18 {-Kidambi}) 55. Kf6 Kd7 (55... Rf8+ 56. Kg7 Rf4 57. Kg6 {Black cannot stop White's g-pawn from advancing.}) 56. Kf7 Rg5 57. Rd2+ Kc6 58. Kf6 Rg8 59. Kf5 $1 Rf8+ 60. Ke6 Rg8 61. Rc2+ Kb6 62. Kf6 $5 {A tablebase move which is interesting to understand. Black;s rook is stuck and White puts Black in a sort of mini zugzwang, where he has to make an uncomfortable move with the king.} Kb7 (62... Kb5 63. Kf5 Rf8+ 64. Kg6 Rg8+ 65. Kh7 Rg3 66. Kh6 Rg8 67. Rf2 $18 {[%CAl Yf2f5,Yf5g5]}) 63. Kf5 Rf8+ 64. Kg5 Rg8+ 65. Kf4 Rf8+ 66. Ke3 Rg8 67. Kf2 Rf8+ 68. Kg1 Rg8 69. Rc4 Ra8 $5 70. Kf2 $1 $18) 53. Kf4 $2 ({Missing the easy win with} 53. Re6+ Kd7 54. Rg6 $18) 53... Rg8 54. g4 Rf8+ 55. Kg3 Rg8 56. Re1 Kd5 57. Re7 Kd6 58. Re2 Kd5 59. Re3 Kd6 60. Re2 Kd5 61. Re7 Kd6 62. Re4 Kd5 63. Kf3 Rf8+ 64. Rf4 Rg8 65. Rf5+ Ke6 66. Kf4 Ra8 67. Kg3 Rg8 68. Kh4 Rh8+ 69. Rh5 Rg8 70. Ra5 Kf6 71. Rf5+ Ke6 72. Rf4 Ke5 73. Kg3 Ke6 74. Rf5 Ra8 75. Kf4 Rb8 76. Kg5 Rg8+ 77. Kh4 Rh8+ 78. Rh5 Rg8 79. Rh7 Kf6 80. Rh6+ Kg7 81. Ra6 Rc8 82. Kh5 Rc5+ 83. g5 Rc7 84. Rb6 Ra7 85. Rg6+ Kh7 86. Rb6 Kg7 87. Rb5 Kh7 88. Rd5 Kg7 89. Rd4 Kh7 90. Re4 Kg7 91. Re3 Kh7 92. Rf3 Kg7 93. Rf2 Kh7 94. Rg2 Kg7 95. Rg1 Kh7 96. Rh1 Kg7 97. Rh4 Rb7 98. Rf4 Ra7 99. Rb4 Kh7 100. Rb3 Kg7 101. Rb2 Kh7 102. Rb1 Kg7 103. Rc1 Kh7 104. Rd1 Kg7 105. Rd2 Kh7 106. Re2 Kg7 107. Re3 Kh7 108. Rd3 Kg7 109. Rd4 Kh7 110. Rc4 Kg7 111. Rc5 Kh7 112. Rb5 Kg7 113. Rb6 Kh7 114. Rb8 Kg7 115. Rc8 Kh7 116. Rd8 Kg7 117. Re8 Kh7 118. Rf8 Kg7 119. Rf4 Kh7 120. Rf3 Kg7 121. Rg3 Kh7 122. Rg4 Kg7 123. Rh4 Rb7 124. Rh3 Ra7 125. Rf3 Kh7 126. Re3 Kg7 127. Rd3 Kh7 128. Rc3 Kg7 129. Rb3 Kh7 130. Rb4 Kg7 131. Rb5 Kh7 132. g6+ Kg7 133. Kg5 Rc7 134. Ra5 Rb7 135. Rd5 Ra7 136. Re5 Rb7 137. Kf5 Ra7 138. Rb5 Rc7 139. Ra5 Rb7 140. Re5 Ra7 141. Kg5 Rb7 142. Rf5 Ra7 143. Rf7+ Rxf7 144. gxf7 Kxf7 1/2-1/2