Here is another fragment from a blitz game I played (with white pieces). A key piece of it is the rook on g7 supported by the f6 pawn. Are they a strength or a weakness (since the rook does not get to move at all)?
43... Rb1+ 44. Kxe2
44... R8b2+? Given that Black's king is completely out of play - it is not in Black's interest to trade rooks - the deficit of a piece (a king is a very important piece in the endgame) will become a lot more obvious.
44... Rh1! was a much better try - I cannot find a way for White to win. 45. Kd3 Rxh3+ 46. Kd4 Rf8 47. Ra7 (47. Ra6 Rg3 48. Rxd6 Rxg4+ 49. Kd3= (49. Kc5 Rf4 50. Kc6
50... Rxf6 with 2 pairs of rooks on the board, Black had a better chance of releasing the king from the corner by targeting f6 pawn. 51. Rxf6 Kxg7 52. Rf2 Rc8+ 53. Kb5 Rb8+=)
)
47... Rg3 48. Raxf7 Rxf7 49. Rxf7 Rxg4+ 50. Kc3 Rg3+ 51. Kb4 Rf3 52. Rf8+ Kh7 53. c5 dxc5+ 54. Kxc5 g4 55. d6 Rd3 56. Kc6 g3 57. d7 g2 58. Rf7+ Kg6 59. Rg7+ Kxf6 60. Rxg2
60... h5 TABLE BASE DRAW 61. Rg8 (61. Rg3 Rd4)
61... h4 62. d8=Q+ Rxd8 63. Rxd8 Kf5=
45. Rxb2 Rxb2+ 46. Kd3 Rb7 46... Rb3+ 47. Ke4 Rxh3 48. Rxf7 Kg8 49. Rd7 h5 50. Kf5 Rf3+ 51. Kg6
47. Kd4 47. c5! was winning faster
47... Rc7 48. Kd3 48. c5 Rxc5 49. Rxf7 Kg8 50. Rg7+ Kf8 51. Rd7 Rc2 52. Rxd6 Kf7 53. Re6 Rh2 54. Ke5 Re2+ 55. Kd6 Ra2 56. Re3 Kxf6 57. Rd3 Kf7 was a bit less clear.
48... Rb7
49. c5 on the second repetition - I found the right way. The White king successfully battles the rook and helps the d pawn to promote.
49... dxc5 50. Kc4 Rc7 51. d6 Rc6 52. Kd5 Rc8 52... c4 53. Kxc6 c3 54. d7 c2 55. d8=Q#
53. d7 Rd8 54. Rxf7 c4 55. Kxc4 Kg8 56. Rg7+ Kf8 57. Kd5
57... Ra8 Black resigns
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