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Bernardo Roselli Mailhe vs Guillermo Cerda Albornoz
American Continental (2018), Montevideo URU, rd 4, Jun-03
Bogo-Indian Defense: Grünfeld Variation (E11)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Sep-10-19
Premium Chessgames Member
  g15713: E. 1
Black to move. Last: 48.Rxe3


click for larger view

Unfortunately, FinalGen estimates that it would require over 11 TB of disk space hence we have to use Stockfish.

Black had numerous chances to draw this game but...

Stockfish 25-minute analysis:

1) =0.00 (55 ply) 48...h5 49.Re6+ Kg7 50.Kg3 hxg4 51.Kxg4 Rd7 52.f4 Kf7 53.Rc6 Rd5 54.Rc7+ Ke6 55.Rxa7 Rxb5 56.f5+ Rxf5

2) =0.00 (55 ply) 48...Kf6 49.f4 Rc7 50.Rh3 Rc4 51.Kg3 Kg7 52.Rh2 Rb4 53.Ra2 Kg6 54.Rxa7 h5 55.Rd7 Rb3+ 56.Kh4 hxg4 57.Rd5 g3 58.Rg5+ Kf6 59.Rxg3 Rxb5 60.Kg4 Rc5 61.Rh3 Kg6 62.f5+ Rxf5

Game continued:

48...Rc7 49. Re6+ Kg7 50. Re5

E. 1.1
Now Black can play 50...Rc5 =


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Stockfish 15-minute analysis:

1) =0.00 (55 ply) 51.f4 Rc2+ 52.Kg3 Kf6 53.Rd5 Rb2 54.Rd6+ Kg7 55.Rd7+ Kf6 56.Rxa7 Rxb5 57.Rh7 Kg6 58.Rc7 Rb3+ 59.Kh4 Rb1 60.f5+ Kf6 61.Rc6+ Kg7 62.Kg3 Rb3+ 63.KStockfisf4 Rb4+ 64.Ke5 Rxg4 65.Rc7+ Kg8 66.f6 h5 67.Ke6 Re4+ 68.Kf5 Rg4 69.Rb7 Kf8 70.Rh7 Rb4 71.Ke5 h4 72.Rb7 Rb2 73.Rb8+ Kf7 74.Rh8 Rh2 75.Rh7+ Kg6 76.f7 Rf2 77.Rxh4 Kxf7

2) =0.00 (54 ply) 51.Re7+ Kf6 52.Rxa7 Rxb5 53.Kf2 h5 54.gxh5 Rxh5 55.Rd7 Rg5 56.Rd6+ Kf7 57.Rxb6

3) =0.00 (54 ply) 51.Rxc5 bxc5 52.f4 c4 53.Kf3 h5 54.gxh5 Kh6 55.Ke4 Kxh5 56.Kd4 Kg4 57.Kxc4

Game continued after 50. Re5 with:

50...Kf6 51. Rf5+ Kg6 52. Kg3

Now Black can again play 52...Rc5 =

Stockfish:

1) =0.00 (44 ply) 52...Rc5 53.Kf4 Rxf5+ 54.gxf5+ Kf6 55.Ke4 Kf7 56.Ke5 h5 57.Ke4 Kg7 58.Ke3 Kf7 59.Ke4

Game continued:

52...Rc4 53. Rd5

Now Black can again play 53...Rc5 =

Stockfish:

1) =0.00 (40 ply) 53...Rc5 54.Rd6+ Kg7 55.Rd7+ Kg6 56.Rxa7 h5 57.gxh5+ Rxh5 58.Kg4 Rxb5 59.f4 Rb1 60.Rd7 Rg1+ 61.Kf3 Kf5 62.Rd5+ Kg6 63.Ke4 Re1+ 64.Kd4 Rf1 65.Rg5+ Kf6 66.Ke4 Re1+ 67.Kd4 Rf1

Game continued:

53...Rb4 54. Rd6+ Kg7 55. Rd5

Now Black can play 55...Rb3 =

Stockfish:

1) +0.08 (25 ply) 55...Rb3 56.Kf2 Kf6 57.Kg3 Kg6 58.Rd6+ Kg5 59.Re6 Ra3 60.Re5+ Kf6 61.Rf5+ Kg7 62.Rd5 Rb3 63.Kf4 Kf6 64.Rd6+ Kg7 65.Rd7+ Kf6 66.Rxa7 Rxb5 67.Rh7 Rb4+ 68.Kg3 Kg5 69.Rh8 Rb3 70.Rg8+ Kf6 71.Kh4 Kf7 72.Rh8 Rxf3 73.Rxh6

Game continued:

55...Ra4 56. f4

E. 1.2
Black to move. Last: 56.f4


click for larger view

Now Black can play 56...Ra3+ =

Stockfish 15-minute analysis:

1) =0.00 (38 ply) 56...Ra3+ 57.Kh4 Ra1 58.Rd7+ Kf6 59.Rb7 Rh1+ 60.Kg3 Rg1+ 61.Kf3 Rb1 62.Rxa7 Rxb5 63.Rh7 Rb3+ 64.Kf2 Kg6 65.Rd7 Kf6 66.Rd6+ Kg7 67.f5 b5 68.Rg6+ Kh7 69.Rb6 Kg7 70.Rb7+ Kf6 71.Rh7 Rh3 72.Kg2 Rh4 73.Kf3 h5 74.Rh6+ Ke5 75.Re6+ Kd5 76.g5 Rg4 77.g6 b4 78.Rb6 Ke5 79.f6 Rxg6 80.Rxb4 Kxf6

Black instead played 56...a5? which was the losing move.

Stockfish 15-minute analysis after 56...a5:

1) +2.85 (39 ply) 57.Rd7+ Kf8 58.Rb7 Ra1 59.Rxb6 Kg7 60.Rb7+ Kf6 61.Rh7 Kg6 62.Ra7 a4 63.f5+ Kf6 64.Ra6+ Kg7 65.Kf4 Rb1 66.Rxa4 Rxb5
(leads to diagram E. 1.3)

Game continuation ended with:

56...a5 57. Rd7+ Kg8 58. Rd6 Ra3+ 59. Kh4 Kg7 60. Rxb6 Rb3 61. f5 a4 62. Rg6+ Kh7 63. Ra6 a3 64. Ra7+ Kg8 65. Kh5 Rxb5 66. Kxh6 1-0

E. 1.3
White to move


click for larger view

FinalGen considers the position as a win for White after 67. Ra7+!

Example line:

67.Ra7+ Kf8 68.Rd7 Rb4+ 69.Kg3 h5 70.gxh5 Rb6 71.Kg4 Kg8 72.Kg5 Rb1 73.Ra7 Rg1+ 74.Kf6 Rb1 75.Rd7 Rf1 76.h6 Rb1 77.Kg5 Rg1+ 78.Kf4 Rf1+ 79.Ke5 Re1+ 80.Kf6 Kh8 81.Rb7

Reference:

The following passage is on f- and g-pawns versus h-pawn rook endings from Karsten Muller and Yakov Konoval in their memorable 2016 chess book, Understanding Rook Endgames, page 118.

<"With the defender's pawn on its third rank, a lot depends on who controls the second rank. If the defending rook is established there, then the defender can usually draw">

<"If the defender has no control over his second rank, then the attacker often wins">

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