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Gadir Guseinov vs Joan Hendrik Andreasen
Istanbul Olympiad (2012), Istanbul TUR, rd 3, Aug-30
French Defense: McCutcheon. Lasker Variation (C12)  ·  1-0



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Kibitzer's Corner
Jun-09-20  Jaredfchess: I got this one after a bit of thought. I kept looking for mate, but finally realized I can simply take the undefended rook on e7 at the end. This is a good pattern to know. Nice clearance sacrifice.
Premium Chessgames Member
  Predrag3141: The puzzle could have started two plies earlier. White was winning after 27 Nf3.

click for larger view

Black did not choose the sturdiest defense. He may have thought the only way to stop 28 Qh6, 29 Ng5 and mate was 27 … Kg7?, dropping a knight.

A better, but still inadequate, way was 27 Nf3 Qb2. If White persists with the attack immediately, play continues 28 Qh6? Nxd4 and it is now Black that has a clear advantage.

Black's problem is that 27 Nf3 Qb2 holds off the attack just one move. White simply protects his loose rook, then resumes: 28 Rf1 Nd8 29 Qh6 Ne6

click for larger view

30 Rxe6! Black gets mated after 30 … Rxe6 so he must break his kingside open with 30 … fxe6 31 Qxg6+ Rg7 32 Qxe6+ Kh7 33 Ng5+ Rxg5 34 Qe7+ Rg7 35 Qxf8.

White has regained the exchange with some extra pawns and a more secure king.

Analysis was by Stockfish.

Jun-09-20  Cheapo by the Dozen: I didn't even think of the best line, settling instead for 28 Nh4, with the plan Nf5+/Qh6+. The main line is:

28 Nh4 Nxd4 (exposing Black's queen but threatening to fork White's)

29 Nf5+ Nxf5

30 Rxb6

and White is nicely better despite the rough material equality.

Premium Chessgames Member
  boringplayer: Like <jaredfchess>, I got sidetracked looking for the mate, but Rfc6 leads to the win of a piece.
Premium Chessgames Member
  An Englishman: Good Evening: 14...Na5 allowed a fine Rook lift Rb1-Rb4-Rh4-Rf4. Forced one more dark square weakness on an already porous Black King side.
Jun-09-20  jith1207: Lot of Good ideas in the first hour of Kibitzing..

I too eventually found the solution after five minutes of looking elsewhere, it's funny how the mind prioritizes looking for mate in puzzle position and gets to see winning a piece only when all other options aren't that promising.

I wonder how that all plays into mind over the board because it's not easy to see if not properly trained and conditioned to look at all such options at every position with open and focused mind that quickly works out all such combinations. Maybe, that's what separates strong Masters?

Jun-09-20  mel gibson: I mucked this up -
I thought it was p-e6.
I should have looked longer.

Stockfish 11 says:

28. Rfxc6

(28. Rfxc6 (♖f6xc6 b7xc6 ♕f4-f6+ ♔g7-g8 ♕f6xe7 ♕b6-b8 ♕e7-g5 ♕b8-c7 ♕g5-h6 f7-f6 ♕h6xg6+ ♕c7-g7 ♕g6xh5 ♕g7-h7 ♕h5-g4+ ♔g8-h8 ♕g4-f4 ♕h7-g7 e5-e6 ♖f8-g8 ♔g1-f1 ♕g7-g6 ♖c1-e1 ♕g6-d3+ ♖e1-e2 ♕d3-g6 ♖e2-e3 ♕g6xg2+ ♔f1-e1 ♕g2-g6 ♘f3-d2 ♖g8-e8 ♖e3-h3+ ♔h8-g8 ♖h3-g3 ♖e8xe6+ ♔e1-d1 ♔g8-f7 ♖g3xg6 ♔f7xg6) +10.51/33 88)

score for White +10.51 depth 33

Premium Chessgames Member
  agb2002: The rook on e7 becomes defenseless after 28.Rfxc6 bxc6 and White emerges a knight up after 29.Qf6+ Kg8 30.Qxe7 Qb2 31.Qc5 Qxa2 32.Qxc6.
Jun-09-20  saturn2: White wins a piece by 28. Rfxc6 bxc6 29. Qf6
Jun-09-20  Brenin: Black's manoeuvre Na5, Bd7, Bb5 and Bxd3 exchanged a bad B for a good one, but it gave White time to build up an attack, force K-side weaknesses, undouble his c-pawns, and shore up the centre with d4. Preventing 28 Qh6 was an obvious aim, but 27 ... Kh7 was no better than 27 ... Kg8, since 28 Rxg6+ then wins.
Jun-09-20  TheaN: Somehow I did not get myself sidetracked on this one (as I felt like the king side was well enough defended, at least at hand), and basically spotted the entire variation posted by <agb>: <28.Rfxc6 bxc6> a queen move is worse <29.Qf6+ Kg8 30.Qxe7 Qb2 31.Qc5 Qxa2 32.Qxc6 +-> near instantly.

The Nh4-f5 maneuver looks natural but is taking some time, especially with the Black pieces aiming at d4 it's tricky. White is up but barely after 28.Nh4?! Nxd4! threatening Ne2+ 29.Nf5+ (Rxb6? Ne2+ ∓; Qe3? Qb2 ∓) Nxf5 30.Rxb6 ±. Apparently that's just +1 but it would be tough for Black to defend R+N vs Q.

Jun-09-20  malt: Removing the defender on c6, wins a piece.
28.Rf:c6 bc6 29.Qf6+ Kg8 30.Q:e7 Qb2
31.Qg5 Re8 (31...Q:a2 32.e6 )
Premium Chessgames Member
  Predrag3141: My favorite move of the game was

click for larger view

23 c4, either winning e4 for the knight or splitting part of Black's fortress on the white squares (Black chose the latter).

Premium Chessgames Member
  Predrag3141: <Preventing 28 Qh6 was an obvious aim, but 27 ... Kh7 was no better than 27 ... Kg8, since 28 Rxg6+ then wins>

I think you meant 27 … Kh7 28 Rxg6 (not with check) and that looks like a nice win: if Black takes with the king it appears at first to be mate and if he takes with the pawn his kingside is broken up with even material.

But it turns out 27 ... Kh7 28 Rxg6 Kxg6 is not mate because Black can move his f-pawn while being up a rook. Stockfish gives 27 … Kh7 28 g4 hxg4 29 Ng5+ Kg8 30 Qxg4 Nxe5 31 dxe5 Qb2 32 Qh4 Qxc1+ 33 Kg2 Qxg5+ 34 Qxg5 Rfe8

On move 27, Stockfish gives the best defense (still not adequate) as 27 ... Qb2, which I posted above.

Jun-09-20  Brenin: Thanks, <Predrag3141>, after 27 ... Kh7 28 Rxg6 is indeed without check. Then, to avoid mate, Black must play 28 ... KxN 29 Nh4+ Kh7 30 Qf5+ Kg8 31 Qg5+ Kh7 32 Qxh5+ Kg8 33 Qg5+ Kh7 34 Nf5 f6 35 exf6, e.g. 35 ... Ref7 (or d7 or c7) 36 Qh5+ Kg8 37 Nh6+, with mate in a few moves. Black's best is 35 ... Rxf6 36 Qxf6, two pawns down with a hopeless position due to the exposed K.
Premium Chessgames Member
  gawain: Setting the puzzle aside for a while allowed me to see different possibilities. (Including the winning one.)
Jun-09-20  RandomVisitor: After 16.Rh4 it looks like the black pawn on h6 needs immediate defending/support with 16...h5 (as played), but black can play 16...0-0-0 since 17.Rxh6 Rxh6 18.Qxh6 can be followed by 18...Qxc3+, regaining material:

click for larger view


<48/76 14:43 0.00 16...0-0-0 17.0-0 g5> 18.Rb4 Rhg8 19.Nd4 Rgf8 20.a4 Kb8 21.Ba6 Bc6 22.Qe3 b6 23.Rfb1 Bd7 24.Re1 Rh8 25.Reb1

Jun-09-20  Nullifidian: The clearance sac 28. ♖fxc6 starts things off. Black can't capture with the queen because of the rook on c1, so 28... ♙bxc6, blocking the black queen's control of the sixth rank, permits 29. ♕f6+ followed by ♕xe7 on the next move, leaving white a piece up.
Jun-09-20  sophiephilo: Just didnt see this.

Looks easy in hindsight. Which makes it worse.

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