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Ivan Sokolov vs Thomas Beerdsen
Batavia (2018), Amsterdam NED, rd 3, Feb-25
Nimzo-Indian Defense: Normal Variation. Bishop Attack Classical Defense (E48)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Jun-11-19
Premium Chessgames Member
  Phony Benoni: It's not at all the same thing, but my second thought was 30.Rf6, channeling Fischer vs Benko, 1963.
Jun-11-19  Skewbrow: The black knight is pinned and only supported by the pawn g7. Furthermore, our bishop is aiming at h7. Let's add to the pressure with 30.Rf6. Black's options are: A) trade queen for a rook, B) 30..gxf6 31.Qxh6 and 32.Qh7x. C) Anything else with 31.Rxh6 and the same mate in 2 moves. 1-0
Jun-11-19  Amarande: 30 ... Kg8 (to avoid White getting tempo by capturing on h6 with check) does not help, by the way, but only delays mate by three moves: 31 Rxh6 gxh6 32 Qxh6 Re8 (else Qh7#) 33 Bh7+ leading into the familiar mate at f7.
Jun-11-19  Cheapo by the Dozen: 30 ... Re8 to make Luft fails in basically the same way as the defensive try <Amarande> notes.
Jun-11-19  saturn2: Black has rook for knight.

I saw 30. Rf6 threatens Rxd6 (winning a piece) and Rxh6 (mate)

Jun-11-19
Premium Chessgames Member
  Diocletian: <Phony Benoni> I had exactly the same reaction and recalled the same Fischer game.
Jun-11-19
Premium Chessgames Member
  agb2002: White has a knight for a rook.

White can win a piece with 30.Bxa8 but the alternative 30.Rf6 looks much quicker:

A) 30... gxf6 31.Qxh6+ Kg8 32.Qh7#.

B) 30... Re8 31.Rxh6+ gxh6 (31... Kg8 32.Rh8#) 32.Qxh6+ Kg8 33.Bh7+ Kh8 34.Bg6+ Kg8 35.Qh7+ Kf8 36.Qxf7#.

C) 30... g6 31.Qxh6+ Kg8 32.Rxg6+ fxg6 33.Qxg6+ Kh8 34.Qh7#.

D) 30... Be7 31.Rxh6+ gxh6 32.Qxh6+ Kg8 33.Qh7#.

E) 30... Qxf6 31.exf6 Rae8 32.fxg7+ Kxg7 33.Ng3 Bxg3 34.Qxg3 + - [Q+B vs 2r].

Jun-11-19  AlicesKnight: Found Rf6 fairly quickly. Nice care-free move and effective coup-de-grace.
Jun-11-19  TheaN: Have to admit that I kind of not checked 30....Re8: this more because 30.Rf6 also attacks the bishop on d6, and I realized 'anything defending mate follows Rxd6'. Granted, after 30.Rf6 Re8 31.Rxd6?! Black is forced to play 31....Qxd6 32.exd6 +- and White can go on cruise control, but the mate is better (and more aesthetically pleasing). However, I doubt Black would ever play 30....Re8, as then opting for 30....Qxf6 is a lot better (yet not changing the result).
Jun-11-19  mel gibson: An easy puzzle but it still took me
15 seconds to check it.

Black has to lose its Queen or be mated.

Jun-11-19  zb2cr: 30. Rf6 puts a lot of pressure on Black.

If 30. ... gxf6; 31. Qxh6+ is mate in 2.

If 30. ... Qxf6; 31. exf6, Rae8; 32. fxg7+, Kxg7 leaves White with Q+N vs. 2R.

If. 30. ... Rfe8; 31. Rxh6+, gxh6; 32. Qxh6+, Kg8 and now the well-known trick 33. Bh7+ gives mate in 4.

Jun-11-19  DrGridlock: Hard to initially see that black's pawn on g7 is overloaded ... but it is. The g7 pawn: (1) protects the knight on h6 from capture by white's queen; and (2) keeps white's rook out of f6 (and increasing pressure on the h6 knight).

Rf6 highlights the overload.

Jun-11-19  R4f43l L3 M4550n: Only a fraction of the time to identify Bishop takes Rook at a8 and I am very satisfied with the result. As the puzzle is 'easy' (Tuesday)I did not bother in search more, so I failered miserably.
Jun-11-19  patzer2: Quickly found 30. Rf6! solving today's Tuesday puzzle, and was not suprised to see Black immediately resigned.

Stockfish 10 indicates Black's best reply is 30. Rf6! Qxf6 31. exf6 +- (+8.93 @ 32 ply) exchanging Queen for Rook in a clearly lost position.

P.S.: So where did Black go wrong? Black's decisive mistake appears to be 18...dxe4? 19. fxe4 +- (+2.30 @ 34 ply, Stockfish 10) conceding White a decisive attacking position.

Instead, the clever 18...c5! parries the threatened pawn fork to give Black practical drawing chances (albeit a pawn down) after 18...c5! 19. Bb5! (not 19. e4? cxd4 20. exd6 dxc3 ⩱) 19...Rf8 20. dxc5 bxc5 21. exd5 Rb8 ± (+0.99 @ 29 ply, Stockfish 10).

A few moves earlier, instead of 14...Bb7? 15. Qc2 ± (+1.37 @ 31 ply, Stockfish 10), Black could have held it near level with 14...Be7 15. Qc2 g6 15. Bg3 Nh5 16. Bf2 Bb7 ⩲ (+0.57 @ 29 ply, Stockfish 10).

In the opening, Stockfish 10 indicates 10...Nf8 (clearning the way for the development of the White square Bishop) gives Black equality. However, according to our Opening Explorer, White lost both games in which 10...Nf8 was played. Instead, Black has had better results and more active counter-play with 10...c5 as in Black's win in M Pantzar vs T Abrahamyan, 2018.

Jun-11-19  Damenlaeuferbauer: After long pondering, my old Bosnian-born, but now Dutch friend Ivan rejected the simple, but also winning 30.exd6 and 30.Bxa8 and instead found the prettiest move 30.Rf6!, of which he was very proud! After this game, I remembered him, that he beat the immortal Gazza with the same opening (Nimzo-Indian, Rubinstein variation) in Wijk aan Zee 19 years ago, what he confirmed with smiling and laughing!
Jun-11-19
Premium Chessgames Member
  whiteshark: <30.Rf6!> (aka Alekhine's block), and that's it.

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