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Yifan Hou vs Xu Yuanyuan
Jinan Torch Cup (2005), rd 3, Apr-22
Caro-Kann Defense: Exchange Variation (B13)  ·  1-0

ANALYSIS [x]

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sac: 27.Bxg6 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
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May-27-15
Premium Chessgames Member
  patzer2: Here's a look with Deep Fritz 14 at the game and today's Wednesday (27. ?) puzzle:

<8...Bxe2?!> Black gains nothing from this weak exchange of Bishop for Knight. Better is enticing White to give up the Bishop with 8... h6 9. Bxf6 Qxf6 10. O-O Bd6 = (-0.04 @ 20 depth).

<25...Bxe5?> This gives White a much too easy win.

Black can put up much more resistance with 25... h5 26. Qg5 f6 27. Qxh5 Bxe5 28. Qf3 (+1.47 @ 24 depth).

<26. f6!> This is the game winning move, which sets up our Wednesday (27. ?) puzzle solution.

<26...g6 27. Bxg6!> This move (i.e. 27. Bxg6!) solves today's Wednesday puzzle, and is a follow-up to the combination begun with 26. f6! .

<26...fxg6 28. Qxg6+ Kh8 29. Rf5!>

Here 29. Rf5! or 29. Re1! are the only winning moves.

A potential blunder here for White is 29. f7?? allowing 29...Qd6! .

<29... Bxf6>

If 29... Bd6, then 30. f7 forces mate-in-two.

If 29... Rg8, then 30. Qxh6+ Qh7 31. Rh5! Qxh6 32. Rxh6#.

<30. Qxh6+ Qh7 31. Qxf6+ 1-0>

Black resigns in lieu of 31...Qg7 32. Rh5+ Kg8 33. Qe6+! (also winning is 33. Rg5 ) 33... Qf7 34. Rg5+ Kf8 35. Qd6+ Qe7 36. Qxb8+ with mate soon to follow.

May-27-15  Jamboree: Oooh, wait, maybe in my line 29. ... Qd6! puts up more resistance -- it stops immediate mate, but white can still reposition her pieces and keep attacking in various ways -- it's still anyone's game. So maybe the original OTB solution was more forcing after all.
May-27-15  diagonalley: it simply has to be 27.BxKNP .... when black's only hope appears to be 27.... BxKBP which (as <al wazir> points out) results in white gaining a significant end-game advantage.
May-27-15  diagonalley: (PS. <patzer2> : i don't think your move 30.Qxh6+ is legal!)
May-27-15
Premium Chessgames Member
  jith1207: <patzer2> not sure if I'm looking right, what happens if black plays 29..Qh7?
May-27-15  newzild: <jith1207> <not sure if I'm looking right, what happens if black plays 29..Qh7?>

If 29...Qh7 then simply 30. Qxh7+ Kxh7 31. Rxe5.

May-27-15  Cybe: 29... B:f6? Stronger: 29... Qh7. And after 30. Q:h7, 30... K:h7, 31. R:e5, 31... b4 (31... Kg6) White is quite better, but the way to the victory is not so short.
May-27-15  cocker: A very tough week so far
May-27-15  zb2cr: 27. Bxg6, fxg6; 28. Qxg6+ is obvious. As <patzer2>'s post of <Deep Fritz 14> shows, after 28. ... Kh8, 29 f7 allows Black to play 29. ... Qd6!

Much more dangerous for Black is 29. Rf5!
In that case, Black has to give back the piece, because 29. ... Rg8 leads to disaster in the form of 30. Qxh6+, Qh7; 31. Rh5 and Black is stuck.

After Black has played 29. ... Bxf6; 30. Qxh6+, Kg8; 31. Rxf6 and Black has no defense.

May-27-15  Chess Dad: 29... Bxf6 was a blunder. White was winning, with a score of about +2.5 before that move, but with a +m13 after.

Not that I would have neccesarily found the correct moves from that point. I would have taken the bishop immediately instead of pawn then bishop.

May-27-15  morfishine: Pattern Recognition: The pawn on <f6> prevents the Black Queen from blocking checks on the g-file at <g7>. White can sacrifice on <g6>

<27.Bxg6> 27...fxg6 28.Qxg6+

*****

May-27-15  CHESSTTCAMPS: Material is even in this opposite-colored bishop middle-game, but white's f6 pawn is nearly as valuable as a minor piece in a king-side attack. Obviously, white is set up to crack open black's castled position, but needs to do the math first!

27.Bxg6!

A) 27... fxg6 28.Qxg6+ Kh8! 29.Rf5!! (stronger than Qxh6+ Qh7) Bd6 (an attempt to defend the triple threat of 30.Rxe5, 30.Qxh6+ and 30.Rh5) 30.f7 Bf8 (otherwise 31.Qxh6#) 31.Qg8#

A.1) 27... Kf8 29.f7! (clearer than Qxh6+ Kf7 30.Qg7+ Ke6) Bg7 30.Qh7 Qxf7 (otherwise 31.Qg8+) 31.Rxf7+ Kxf7 32.Qf5+ followed by Qxd5 with a won ending.

A.2) 29... Bxf6 30.Qxh6+ Kg8 31.Qxf6 followed by 32.Rg5.

B) 27... Bxf6 28.Rxf6 fxg6 29.Rxg6+ Kh7 (Kf8 30.Qe6|f5+ or Rg8+ all win) 30.Qf5 Kh8 31.Qf6+ Kh7 32.Rxh6+ Kg8 33.Rh8#

C) 27... Kh8 28.Be3 followed by Qf5 or Qh5 wins quickly.

Time for review....

May-27-15
Premium Chessgames Member
  patzer2: <diagonalley: (PS. <patzer2> : i don't think your move 30.Qxh6+ is legal!)> The capture of an unprotected pawn on h6 with check by White's Queen for White's 30th move makes 30. Qxh6+ (as played in the game) a legal move. Am I missing something?
May-27-15
Premium Chessgames Member
  chrisowen: Ebony monarch h8 and sway above hooters and shooters ave spark hoofers cattle prod f5 later huff fog angles son slide croque h7 am,

monsieur abreast cheese rook fondue clock 30...Qh7 31.Qxf6+ mate ave at elevensies or about that an good bad spy h7 creates cloud mixture angle g6 as first ive rook f5 at wheel ive got etc able wire bus angle f6 efface off at effect ramble give f5 spark queen's a fag pin h7 at ball etc dance f6 offer tile ground ash as la ship coaster thin f5 hi light f6 angle gums cap ave road tads waddle h7 arrive heffas-lump and bail sand rich sac fog h7 it seem like for won i be proof rook plum ave source at dress up ply reignitions ive lovely am referral as wallowed it edict h6 ave mash f5 tier h7 am bad frown f6 command h8 at stuck ive got h7 ebony on rack home f5 ebullient as ever,

tickle angle f6 efface off cast ship
light g6 pave hope focus hive at tell

am cows care f5 eg won f6 angle shina cruise and bruise cab dux inter glides ive glide off at each f5 moon doot bad cup h7 ive ebullient ebony hope gone vets f5 angle f6 at won am d3.

May-27-15
Premium Chessgames Member
  kevin86: The bishop sac was a clear way to break up the pawn structure and black's game.
May-27-15  Clodhopper: Wednesday-Thursday, the first move is usually easy to see; it's the follow-up on the third or fourth move that is the hard part....
May-27-15
Premium Chessgames Member
  patzer2: <jith1207: <patzer2> not sure if I'm looking right, what happens if black plays 29..Qh7?> <Newzild> is correct.

If 29...Qh7, then 30. Qxh7+ Kxh7 31. Rxe5 (+2.60 @ 26 depth, Deep Fritz 14) wins easily.

May-27-15
Premium Chessgames Member
  patzer2: <diagonallyey> If 27...Bxf6, then 28. Rxf6 fxg6 29. Rxg6+! forces mate-in-11 (Deep Fritz 14 @ 22 depth).
May-27-15
Premium Chessgames Member
  agb2002: I haven't found the time today to produce a complete analysis and for a while I had the impression that it could be a spoiler but I think I'd play 27.Bxg6 anyway.
May-27-15  BOSTER: < jamboree: 29. f7! >. 29...Qd6.
May-27-15
Premium Chessgames Member
  jith1207: <patzer2> and <Newzlid> Thanks, that makes sense. I was wondering if I was missing any mating line in that scenario. Yes, that should be enough as Black ends up not gaining any advantage and White is on the throttle.
May-27-15
Premium Chessgames Member
  Penguincw: Hmm, I started 0/2, so was hoping to get this, but I only guessed the obvious moves: 27.Bxg6 fxg6 28.Qxg6+ K (any) 29.Qxh6+.
May-27-15  1 2 3 4: <lost in space> how did you figure that out?!
May-27-15
Premium Chessgames Member
  Bubo bubo: Again a tough Wednesday! I saw the line 28...Kh8 29.Rf5!, but failed to see Rf5 in the line 28...Kh8: After 29.f7 Bg7 30.Qh7 it looks as if Black could spoil White's plan with 30...Qe5, but 31.Rf5! expels the queen from protecting the bishop, and Black runs out of checks soon: 31...Qe1+ 32.Kg2 Qe2/e4+ 33.Kh3.
May-27-15  Tiggler: Like some others, I fell for 29.f7?? and overlooked 29...Qd6, after which white is struggling to draw.
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