42.Re5?+ I saw the computer on Chess24 say the only winning move was 42.Rb8+! I didn’t understand the point of it, but tried to and found 43.Nf3, even though it’s computer and Stockfish weren’t saying 43.Nf3 at first. It does win. I puttered around with it, but here is sample best play. 42. Rb8+ Kf7 43. Nf3 Bd6 44. Ng5+ Ke7 45. Rh8 Rxd3
46. Rxh7+ Kd8 47. Rh3 Rd5+ 48. Kg4 Rd4 49. Nf7+ Ke7 50. Nxd6 Rxd6 51. Kg5 Rd2
52. Re3+ Kf7 53. h4 Rg2+ ( 53… d5 54. Rg3 Rc2 55. h5 Rc3 56. Kh4 d4 ( 56…
Rc6 57. f5 d4 58. Kg5 ( 58. Rg6 Rc1 ( 58… Rc3) 59. h6 d3 60. Rd6 Rd1 61. Rd7+
Kg8 62. Kg3 Rf1 63. Kg4 Rd1 64. Kf4 d2 65. Ke3 Rf1 66. Kxd2 Rxf5 67. Rg7+ Kh8
68. Rg4 Rb5 ( 68… Rd5+ 69. Kc2 Kh7 ( 69… Rc5+ 70. Rc4 Rb5 71. Kd3 Rd5+ 72.
Rd4 Rb5 73. Kc4 Rb6 74. Kc5 Rb8 75. Rd6 Rf8 76. Kxb4 Rf5 77. Ka4 Kh7 ( 77…
Kg8 78. b4 Rf8 ( 78… Kf8 79. Rd8+ Ke7 80. h7 Kxd8 81. h8=Q+ Ke7 82. b5 Kd7
83. Qd4+ Kc7 84. Ka5 Rh5 85. Ka6 Rh6+ 86. b6+ Kc6 87. b7 Rd6 88. b8=N+ ( 88.
Qxd6+ Kxd6 89. b8=Q+ Kd5 90. Qf4 Ke6 91. Qg5 Kd6 92. Kb6 Ke6 93. Kc6 Kf7 94.
Kd6 Kf8 95. Qg6 ( 95. Ke6 Ke8 96. Qe7#
70.Kxf5?? 70.Rc3 still draws
71.Na4?! 71.Re1 is winning
72.Rb7? This is the wrong pawn to go after. The h-pawn is the key here.
72.Rf7+ Ke6, 73.Rf2 h3, 74.Kh1 Ra1, 75.Nb7 Rb1, 76.Rh2 is winning. After the h-pawn falls, White’s rook goes to the fifth rank, and White’s king and rook coordinate well in this situation to eject the Black king, and then win the b-pawn.
h4 by Karjakin was a mistake, and then 39…Bxh4, 40.Bxe5 is where Magnus returns the favor. 39.Bd5 is winning because by keeping the d6 and h4 pawns on the board, Black can put White into zugzwang (I played it out with the engine on Chess24, which is where I’m watching the match – Matthew, from the chessclub, saw me on that site and chatted hi to me! 🙂
45…f4. This move was widely criticized on the chat, but as Svidler and Eric Hansen were showing, it is difficult to find a win once 45…fxg is played because those g-file pawns of Black stay doubled (instead of White trying to win one back), and somehow the doubledness of the pawns also helps White to try to create a fortress there. I don’t believe anyone found a definite win, only close tries. That’s the problem with endgames, true winning positions are not that difficult; sorta, but not really winning positions are much more difficult to traverse.