[Event "2022 Summer IM C"] [Site "https://lichess.org/study/iJ58YOrj/woCmSSJ2"] [Date "2022.07.25"] [Round "3"] [White "Adewumi, Tanitoluwa"] [Black "Rodriguez Rivera, Pedro"] [Result "0-1"] [WhiteElo "2309"] [BlackElo "2192"] [Annotator "Tillis,Bryan"] [Variant "From Position"] [ECO "?"] [Opening "?"] [FEN "8/5p2/3K2k1/p2Pp3/1p2P3/1Br5/3R4/8 b - - 0 65"] [SetUp "1"] [Source "https://lichess.org/study/iJ58YOrj/woCmSSJ2"] [Orientation "white"] { [#] This position is objectively equal but it is difficult to prove, this is a highly instructive endgame. } { [%evp 0,79,75,46,68,96,107,108,111,92,96,96,96,100,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,-515,-525,-525,-525,-525,-535,-535,-535,-535,-525,-535,-535,-545,-555,-555, -962,-962,-962,-962,-962,-962,-982,-962,-1022,-29580,-29329,-29977,-29978, -29979,-29980,-29981,-29978,-29979,-29980,-29981,-29982,-29983,-29982,-29985, -29986,-29989,-29986,-29991,-29988,-29989,-29986,-29987,-29988,-29989,-29990, -29991,-29992,-29993,-29994] } 65... Rxb3 66. Ke7 Rc3 67. d6 b3?? (67... Kg5 { This is necessary for Black to pick up time compared to the main game. With machine level play it is a draw as the following line shows. } 68. d7 Rc7 69. Kxf7 Rxd7+ 70. Rxd7 Kf4 71. Rd1 Kxe4 72. Ke6 a4 73. Rb1 Kd3 74. Kxe5 b3 75. Kd5 Kc3 76. Rc1+ Kb2 77. Rh1 a3 78. Kc4 a2 79. Rg1) 68. d7 Rc7 69. Ke8 (69. Rg2+! { Will win! } 69... Kh5 70. Ke8 Rxd7 71. Kxd7 a4 72. Rb2 Kg4 73. Kc6 Kf4 74. Kb5 Kxe4 75. Kxa4 f5 76. Kxb3 f4 77. Kc2 Ke3 78. Kd1 { With the White King getting to the queening squares the game is over. }) 69... Rxd7 70. Kxd7?? { Equality! } (70. Rg2+ { This transposes to previous analysis with a win. }) 70... a4?? { Now, White is winning again! } (70... Kg5 71. Rb2 Kf4 { Getting back to the first variation. }) 71. Rd6+?? { This was the last opportunity to win the game. } (71. Rg2+ { Getting the defender one move further away is critical in the evaluation of the position. } 71... Kh5 72. Rb2) 71... Kg5 72. Rb6 f5 73. exf5 Kxf5 74. Rb5 Ke4 75. Rb4+ Kd3 76. Rxa4 b2 77. Rb4 Kc3 78. Re4 { The tables have turned again. We will now reach one of the most difficult endings in chess. This is where experience comes in handy. } (78. Rb8 { This will easily hold the draw. } 78... e4 79. Rc8+ Kd4 80. Rb8 Kc3 81. Rc8+ Kd2 82. Rb8 Kc1 83. Rc8+ { Black can't make progress as the b-pawn needs to be defended. }) 78... b1=Q 79. Rxe5 Kd4 80. Re6 Qh7+ 81. Kc6 Qf7 { Black's goal will be to separate the pieces so that the rook can be picked off. } 82. Kd6 Qa7 83. Kc6 Qc5+ 84. Kb7?? { Black is making progress! } 84... Kd5 85. Rb6 Qe7+ 86. Ka6 Qd7 87. Rb5+ Kc4 88. Rb1 { Now that the rook is away from the king, we attempt to find a pattern to win it. } 88... Qc6+ 89. Ka7 Qe4 90. Rb7?! { We now need to repeat the probing process to get the rook to run again. } 90... Kc5 91. Rc7+ Kb5 92. Rf7 Qd4+ 93. Kb8 Qd8+ 94. Ka7 Kc6 { Notice, it is not easy to give checks, this creates problems for White. } 95. Rb7 Qd4+ 96. Kb8 Qd5 97. Ka7 Qd8 98. Rb1 { Now it is easy to win the rook. } 98... Qd7+ 99. Ka8 Qd8+ 100. Ka7 Qe7+ 101. Kb8 Qf8+ 102. Ka7 Qf7+ 103. Kb8 Qg8+ 104. Ka7 Qh7+ { A very interesting endgame and fantastic effort by IM Rodriguez Rivera. } { [%cal Rh7b1,Rh7a7] } 0-1