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Alexey Goganov vs Baadur Jobava
Aeroflot Open (2016), Moscow RUS, rd 1, Mar-01
Bogo-Indian Defense: Grünfeld Variation (E11)  ·  1-0



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Kibitzer's Corner
Mar-02-16  Mendrys: Oh those gorgeous bishops!

click for larger view

28. Rg6! is a nice tactical shot that Jabovaa probably missed. 28...hxg7 29. Qh6+ is mate the next move. The position at move 28 seems like a good Wednesday puzzle.

Sep-30-17  Kyudaime: <28. Rg6!> is crushing!
Sep-30-17  Walter Glattke: 31.-hxg6 32.Qxg6 Qd7 33.Qh6 Qh3 or
Sep-30-17  Walter Glattke: c: wrong, I had Qg5 instead of Rg5.
Sep-30-17  AlicesKnight: I found myself looking at 28.Rh6 indirectly threatening the Q as well as other nasty things; ...Qxg3+ loses material and meantime Black has Rxh7+ with Rxg7+ to contend with. But the given line looks clear-cut.
Premium Chessgames Member
  Dionysius1: And two lovely pins. The g7 pawn after a possible 28...hxh6 29 Qh6 and the e7 pawn after 34...Ke8
Premium Chessgames Member
  An Englishman: Good Evening: Also thought 28.Rh6 solved the puzzle. Does it qualify as a (second-best) winning move? Or what did I miss?
Sep-30-17  patzer2: I suppose the brilliant 28. Rg6!! Bc5 29. Bxg7+ Kg8 30. Rxg4 Bxe3 31. Bd4+ Kf8 32. Bxe3 +- (+11.24 @ 31 depth, Stockfish 8) is the strongest and prettiest winning solution to today's Saturday puzzle.

However, the simple and mundane 28. Kxf2 Qxe6 29. Rh1! Rf8+ 30. Kg2 +- (+ 4.89 @ 32 depth, Stockfish 8) is also clearly winning as play might continue 30...Rf5 31.Qd3 Ne7 32.c5 Bxc5 33.Bxf5 Qxf5 34.Qxf5 Nxf5 35.Rh5 Ne3+ 36.Kf3 Bb6 37.Bxa5 Nc2 38.Bxb6 cxb6 39.Rd5 Kg8 40.a4 Kf7 41.Rd7+ Ke6 42.Rxb7 +- (+9.65 @ 30 depth, Stockfish 8.)

White needs to avoid getting too cute with 28. Qh6?? (diagram below)

click for larger view

as it allows Black to turn the tables for mate-in-three with 28...Qxg3+ 29. Kh1 Rh2+! (decoy) 30. Qxh2 Qxh2#.

P.S.: Black's decisive mistake appears to be 25...Qg4? allowing 26. Qe3! +- (+3.25 @ 30 depth, Stockfish 8.) Instead, 25...Qf5 26. Qb2 Qg4 27. Qe2 Qxe2 ± (+1.05 @ 31 depth, Stockfish 8) puts up tough resistance with good practical drawing chances.

Earlier, instead of 21...Kh8?! 22. Ne4 ⩲ to ± (+0.55 @ 35 depth, Stockfish 8,) Black could have kept it fully level with 21...Be6 22. Ne4 Qf5 23. Bxc6 bxc6 24. Bxe5 Qxe5 = (0.00 @ 31 depth, Stockfish 8.)

Sep-30-17  patzer2: <An Englishman> Your suggestion 28. Rh6 ± to +- is the computer third choice (after 28. Rg6!!+- and 28. Kxf2 +-) and may well be winning.

It appears to give White strong but difficult winning chances after 28.Rh6 Rf5 29.Kg2 Bc5 30.Bxf5 Bxe3 31.Rxh7+ Kg8 32.Bxg4 Kxh7 33.Rd1 Bh6 34.Bf5+ Kg8 35.Bg6 Rd8 36.Rxd8+ Nxd8 37.Bxa5 Ne6 38.a4 Be3 39.Kf3 Bc5 40.Ke4 c6 41.Be1 +- (+2.79 @ 34 depth, Stockfish 8.)

However, I suspect it would require very strong endgame technique to pull off the win.

Sep-30-17  morfishine: <28.Rxd6>


Sep-30-17  dannydoc: Instead of 32.Bxf7+, White can mate in 5 moves with Qf4.
Sep-30-17  Cheapo by the Dozen: The basic situation is pretty obvious:

-- Material is close to even (Black is up a pawn).

-- Both sides have a hanging rook.

-- Black also threatens at g3.

-- Both sides have loose king positions.

So White should look for rook moves that, among other virtues, inhibit trouble-making at g3. Rxd6, Rg6, and Rh6 all fit that bill.

I wasn't convinced by

28 Rg6 hxg6
29 Kxf2 Bxg6+

in that I didn't think White could reliably get his bishop (or queen) onto the diagonal to cover g8 for the h-file mate.

I already forget what dissuaded me from 28 Rxd6. It wasn't 28 ... Re2, but that's the only strong counter I now can see.

I went with 28 Rh6. But yes, I did overlook the 28 ... Rf5 response.

Sep-30-17  dick50: Black g pawn appears to be adequately supported whereas White g pawn is not. The stunning Rg6 changes everything. Now white g pawn is safe and Black g pawn can not be defended. Whether Rook sacrifice on g6 is accepted or not, g7 pawn and then the game for Black are gone. Black can postpone the loss for a few moves by giving away queen
Sep-30-17  schachfuchs: I found 28.Rg6 rather quickly as it prevents any counter attack against g3 and 28...hxg6 is refuted by 29.Qh6+ and 30.Dxg7 mate, or am I missing sth.?
Sep-30-17  5hrsolver: A move that also deserves merit is the quiet move 31.Rg5.
Sep-30-17  mel gibson: I never would have got that.
the computer agrees with the player:

28. Rg6 (28. Rg6 (♖e6-g6 ♗d6-c5 ♖g6xg4 ♗c5xe3 ♗c3xg7+ ♔h8-g8 ♗g7-d4+ ♔g8-f8 ♗d4xe3 ♘c6-e5 ♖g4-g5 ♘e5-f3+ ♔g1xf2 ♘f3xg5 ♗e3xg5 ♖a8-e8 ♗e4xh7 ♖e8-e5 ♗g5-f4 ♖e5-h5 ♗h7-e4 c7-c6 ♖a1-d1 ♖h5-h2+ ♗e4-g2 ♔f8-e7 g3-g4 ♖h2-h8 g4-g5) +9.26/19 120)

score for white +9.26 depth 19

Sep-30-17  morfishine: Rarely does Jobava fall into such positions, but much credit to Goganov


Sep-30-17  Cheapo by the Dozen: Yikes. What I missed is remarkably simple.

28 Rg6 hxg6


28 Qh6+, with mate next.

Sep-30-17  morfishine: <28.Rxd6> is playable due to Black's hanging rook.

28.Rg6 is best, but what the heck lol


Sep-30-17  cormier:

click for larger view

Analysis by Houdini 4:

33...Qxf1+ 34.Kxf1 Bxg5 35.Qxg5 Rd8 36.Bh6 Rd6 37.Qg7+ Ke8 38.Bf4 Re6 39.Qxc7 b6 40.Qxb6 Rf6 41.Qc7 a4 42.bxa4 h6 43.a5 Nd8 +- (12.31) Depth: 24 not dpa

Sep-30-17  NBZ: Okay so Rxd6 Re2! gives White nothing: material is even after Qf3 Qxe4 Qxe4 Rxe4 Rd7 Re7.

Qxf2 is met by Qxe6, so the rook on d6 is a desperado, which suggests:

28. Rh6!

Now if
[A] 28. ... Qxg3 29. Qxg3 Bxg3 30. Rxh7+ Kg8 31. Rxg7+ and Rxg3 wins.

[B] 28. ... Bxg3 29. Rxh7+ Kg8 30. Rxg7+ Qxg7 31. Bxg7 and the bishop on g3 hangs.

[C] 28. ... Bc5!? looked strong at first but after 29. Rxh7+ Kg8 30. Qxc5 Qxg3+ 31. Kh1 there isn't a good continuation for Black: crucially, the rook on h7 prevents mate on h2, and the queen on c5 eyes the rook on f2 preventing Qxc3.

[D] 28. ... Re2! is complex. 29. Rxh7+ Kg8 and now:

[D1] 30. Qxe2 Qxe2 31. Rxg7+ Kf8 32. Rf1+ Qxf1+ 33. Kxf1 Ne5 and Black might be able to defend.

[D2] 30. Rh8+ Kxh8 31. Qh6+ Kg8 32. Qh7+ Kf8 33. Rf1+ Ke7 and I have thought a lot about this position, but can't see anything clear for White.

Premium Chessgames Member
  Richard Taylor: I didn't really solve this, it was quite difficult indeed.

But I found the first move and some of the ideas but I couldn't work out the correct lines after the first move. But in general I arrived at the right idea.

click for larger view

I first went for:

28. Rg6! Qh3

Then 29. Rh6 which works except it seems if Black plays 29. ... Bf4!

Then I saw that on the computer so I came up with:

28. Rg6 Qh3 29. Bxg7+ Kg8 30. Bd5+ Rf7 31. Bxf7+ Kxf7 32. Rg5

click for larger view

Which also seems to win in all lines.

Sep-30-17  JSYantiss: Walter Glatke, 32. Qxg6 is not possible for White, as you have it written.

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