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Efim Bogoljubov vs Henri Grob
Dresden (1936), Dresden GER, rd 8, Jun-13
King's Indian Defense: Orthodox Variation (E94)  ·  1-0

ANALYSIS [x]

FEN COPIED

Annotations by Stockfish (Computer).      [35435 more games annotated by Stockfish]

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Kibitzer's Corner
Apr-22-04
Premium Chessgames Member
  Honza Cervenka: Brutal attack of Bogoljubov. Grob could have resigned after 21.f4!!
Nov-01-04  Bobak Zahmat: Great pawn attack. Just immpossible to stop after 21.f4!
Nov-02-04  vonKrolock: Grob groggy after 21.f4 indeed, following a series of weak manouvres (Qe8-e5, h5-h4-h3) against Bogo is like trowing alcohol in the fire... Fine touch whith 24.f6: the Pawn spares black Queen's life to support imnediate Checkmate...
Aug-30-12
Premium Chessgames Member
  GrahamClayton: I don't think Bogoljubov was shaking in his seat when he saw Grob's h-pawn charging down the board.
Dec-08-22  Brenin: 21 f4, with Rh3 to follow, e.g. 21 ... Nxg4 22 Bxg4 Qxg4+ 23 Rg3 Qe6 (Qe2 24 Nf6 mate) 24 f5 Qe5 25 f6 with mate to follow.
Dec-08-22  Mayankk: White has an open h file for its Queen while the Black King is not mobile, restricted by its own pieces. White can exploit this by 21 f4, threatening 22 Rxh3 and 23 Qh8#.

The obvious response is 21 .... Nxg4 22 Bxg4 Qxg4+ 23 Rg3. As White is now also threatening 24 Nf6#, the only response is 23 ... Qe6 after which 24 f5 settles the matter with either 25 Nf6# or 25 f6 ... 26 Qg7#.

Dec-08-22  jrredfield: I saw 21 f4 right away to help clear the path for the c file rook and eventually the White B. But I didn't expect 21 ... Nh5. Nothing would have saved Black, but 21 ... Qxg4+ would have made things a bit more interesting.
Dec-08-22  mel gibson: I didn't find that difficult.

Stockfish 15 says:

21.f4

(21. f4 (f3-f4 ♘f6xg4 ♗e2xg4 ♕e6xg4+ ♖c3-g3 ♕g4xg3+ h2xg3 f7-f5 ♕h6xg6+ ♔g8-h8 ♘b3-d2 ♖c8-e8 ♘d5-f6 ♖f8xf6 ♕g6xf6+ ♔h8-g8 ♕f6-g6+ ♔g8-f8 e4xf5 h3-h2+ ♔g1-f2 ♔f8-e7 ♕g6-g5+ ♔e7-f7 ♕g5-h5+ ♔f7-e7 ♕h5-h4+ ♔e7-f7 ♕h4-h7+ ♔f7-f6 ♕h7-h6+ ♔f6-e7 f5-f6+ ♔e7-d8 f6-f7 ♘c6-b4 ♕h6-f6+ ♔d8-c8 f7-f8♕ ♔c8-b8 ♕f8-g7 ♗d7-c6 ♕g7-g6 ♖e8-c8 ♘d2-f3 ♗c6-e8 ♕g6-h7 b7-b6 ♕f6-d4 ♘b4-c6 ♕d4-g7 ♘c6-a5 ♘f3xh2 a4-a3 ♕g7-c3 ♘a5xc4 b2xa3 b6-b5 f4-f5) +21.61/34 995)

score for White +21.61 depth 34.

Dec-08-22
Premium Chessgames Member
  ajk68: Hate when I have the right move and discard it because I don't see the right response to one line. 21. f4 Nxg4 22. Bxg4 Qxg4+ 23. Rg3!
Dec-08-22  agb2002: Black threatens axb3.

The rook on c3 suggests 21.f4:

A) 21... axb3 22.Rxh3 Nh5 23.f5

A.1) 23... gxf5 24.Qxh5 and mate in two.

A.2) 23... Qxe4 24.Nf6+ Nxf6 25.Qh8#.

A.3) 23... Qe5 24.Rxh5 gxh5 25.f6 wins.

B) 21... Nxg4 22.Bxg4 Qxg4+ 23.Rg3 Qe6 (23... Qh5 24.Qxh5 wins; 23... Qe2 24.Nf6#) 24.Rxh3 Qxh3 25.Nf6#.

C) 21... Nxd5 22.cxd5 Qf6 (22... Qxe4 23.Rxh3) 23.dxc6 Bxc6 24.Rxh3 Qg7 25.Qxg7+ Kxg7 26.Nd2 wins a piece.

Dec-08-22
Premium Chessgames Member
  chrisowen: Eliminates friday moody grabber jacque it is f4 fiddle it is dad axiom jacky it is eg he it is f4 jalopy!
Dec-08-22  Cellist: I also saw 21.f4 but expected Nxg4 and planned to follow up as others have suggested. After 21. ... Nh5, I would also have followed up with 22.gxh5, but after 22. ... axb3, I wanted to do 23. hxg6, which also works. Black is already in very bad shape when the problem starts.

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