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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


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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


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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


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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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