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Shakhriyar Mamedyarov vs Niclas Huschenbeth
Tradewise Gibraltar (2012)  ·  Queen's Indian Defense: Kasparov-Petrosian Variation. Romanishin Attack (E12)  ·  1-0
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Last move:

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sac: 28.Bxg6 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 3 ·  Later Kibitzing>
Feb-11-12  romni: 29.B-a5!! is the stunner, must admit I missed it.I dont think the combo works in reverse order...perhaps the Black King can run for cover!?
Feb-11-12
Premium Chessgames Member
  morfishine: Both Bishops will be sac'd: Which one first?

Decided on <28.Ba5 Qxa5 29.Bxg6 fxg6 30.Qxg6+ Kf8 31.Rg3> arriving at the same position starting with <28.Bxg6>.

Finally finding that 31...Nf5 isn't sufficient due to 32.Qg8+ Ke7 <33.Qh7+>

This is a very good puzzle; really forces one to micro-analyze the precise differences between <28.Bxg6> and <28.Ba5>.

Having committed to <28.Ba5> I see the main argument against this move is Black doesn't have to accept the second Bishop as <Phony Benoni> points out. If thats the case, what solid alternative is there for Black?

White's threat is the sequence 30.Bxh5+ followed by 31.Rg3

2 insufficient alternatives for Black are <29...Rd7> which fails to the above and <29.Nf5?> which fails to simple 30.Bxf5+

This one needs to be followed up closely until the 'chess truth' of the position is revealed

Feb-11-12  coolknight: A beauty! After Bxg6, fxg6 is forced and Ba5 is a neat deflecting sac. I was wondering for a while how to continue after 30. Qg6+ Kf8. As it turns out, the Q on g6 and <Gilmoy>'s e5-e6 "virtual Rook" combine nicely to cut off the king's escape to the Q-side.
Feb-11-12
Premium Chessgames Member
  Memethecat: 1st impressions: sac Bg6 or the quite Qh6 stopping escape. Rg3 & Ba5 to drag the BQ from 7th rank also worth a look.

a<28Ba5 Qxa5 29Bxg6 fxg6 30Qxg6+ Kf8 31Rg3 Nf5 32Qg8+ Ke7 33Qh7+ Ke8 (33...Ng7 34Rxg7+ Ke8 35Qh8#) 34Rg8#> too quick for sat, must be missing something.

b<28Bxg6 fxg6 29Ba5 Qxa5 30Qxg6+ kf8 31Rg3 Nf5 32Qg8+ Ke7 33Qh7+ Ke8 (33...Ng7 34Rxg7+ Ke8 35Qh8#) 34Rg8#>

c<28Ba5 Qxa5 29Bxg6 Kf8 30Bxf7 Kxf7 31QXh5+ Ke7 32Qh7+ Ke8 33Rg3 ~ 34Rg8#>

OK that's all I've got. These weekend puzzles really take it out of you.

*******************

Well shiver me timbers, does anybody else think that was easy for a Saturday? I wonder if my a & b answers work equally.

6/6

Feb-11-12
Premium Chessgames Member
  OhioChessFan: <Phony: Still, I won't be surprised if several go that way and some Stalwart Analyst finds a win with 28.Ba5. For White, that it.>

The problem with 28. Ba5 first is 28...Qxa5 29. Bxg6 Nf3+ 30. Rxf3 Bxf3 and without the Rook, things are much tougher for White.

Nobody has mentioned it, but the simple 28. Bxd4 cxd4 29. Rg3 should win too.

Feb-11-12
Premium Chessgames Member
  OhioChessFan: I stand corrrected. Back on page 1 I see <BadKnight> mentioned the 28. Bxd4 line.
Feb-11-12
Premium Chessgames Member
  OhioChessFan: Having a bad morning. <MHassan> referenced it too.
Feb-11-12  coolknight: <morfishline> after 28. Ba5 Qxa5 29. Bxg6, black can play 20. ..Ke8 getting out of the pin, and there's no mate in sight for white, who has little to show for the sacrificed bishop, save a pawn or two.
Feb-11-12
Premium Chessgames Member
  morfishine: <OhioChessFan> Good points on <28.Ba5> and <28.Bxd4> (although previously mentioned, you still arrived at those yourself)
Feb-11-12
Premium Chessgames Member
  Memethecat: <Once> Got your Dan Heisman link this morning, much appreciated, I've saved it for later perusal as I'm am all chess'd out after this mornings puzzle.
Feb-11-12
Premium Chessgames Member
  David2009: Mamedyarov vs N Huschenbeth, 2012 White 28?

How best to dynamite Black's fortress? 28.Bxd4 cxd4 29.Rg3 threatens Bxg6 etc but Black can defend. 28.Rg3 works against Nf5 29.Bxf5 exf5 30.e6 etc (which I think wins) but Black has 28...Ne7 when 29.Bxg6 is unclear. OTB I would select 28.g4 but Black can try 28...Ba8 29.gxh5 Qb7 30.Be4 Qxe4 31,Rxe4 Nf3+ 32.Kg3 Nxg5 and Black has won a piece. Let's hope Black does not spot Ba8 (is this a spoiler?). I'm not sure now what I should play. Time to check and then let Crafty End Game Simulator do the work:
======
Missed it completely: I had rejected the line 28.Bxg6 fxg6 29.Qxg6+ Qg7 when Black is on top, but 29.Ba5!! wraps it up. Position check:


click for larger view

Interactive link: http://www.chessvideos.tv/endgame-t... Alas 28.g4? throws away the advantage being met by the simple hxg4! 29.Qxg4 Nb5 30.Rg3 Nxc3 31.Bxg6 Qxe5! and Black's counter-attack wins the day. 32.bxc3 runs in to a brick wall: 32...fxg6 33.Qxg6+ Kf8 and White is busted (the Rg3 is pinned). Better is 32.Bd3+ Kf8 33.bxc3 but Qe1! is then very strong. Time to digest the other kibitzes.

Feb-11-12
Premium Chessgames Member
  lost in space: pffff, missed 29. Ba5
Feb-11-12  CHESSTTCAMPS: In this middle-game attacking position, white has the bishop pair and a lifted rook ready to pounce on the king-side. A bishop sac at g6 is the obvious breakthrough that white seeks, but when and how? The immediate 28.Bxg6 fxg6 29.Qxg6+? fails against 29...Qg7 30.Qxh5?? Qxg2#. I was on the verge of posting a solution starting with 28.Bxd4(?) cxd4 29.Rg3 Kf8 30.Bxg6, when I realized that black has a tougher defense with 29... Rd7. Then I found something better.

28.Bxg6! (after all) fxg6 29.Ba5!! Qxa5 (29... Q other 30.Bxd8 wins easily) 30.Qxg6+ and now

A) 30... Kh8 31.Qh6+ Kg8 32.Rg3+ Kf7 33.Rg7+ Kf8/e8 34.Qh8#

B) 30... Kf8 31.Rg3 Nf5 32.Qg8+ Ke7 33.Qh7+! Ng7 (otherwise 34.Rg8#) 34.Rxg7+ Ke8 35.Rg8#

B.1) 31... Re8 32.Qg7#

B.2) 31... Other 32.Qg8+ Ke7 33.Rg7#

Over the board, I would likely have gone down the wrong path. Time for review...

Feb-11-12  CHESSTTCAMPS: (29... Q other 30.Bxd8 wins easily) is a little breezy. "Wins with careful play" is more like it.
Feb-11-12
Premium Chessgames Member
  morfishine: This is the most useful miss I've ever suffered. It all makes sense now: <28.Bxg6> first then <29.Ba5> (since <28.Ba5 Qxa5> allows the Queen to penetrate to <d2> [declining the Bishop after <29.Bxg6>]). With <28.Bxg6 fxg6 29.Ba5> The Black Queen won't have time to penetrate to <d2> since the White Queen checks <30.Qxg6+>
Feb-11-12  jackpawn: Are Saturday puzzles getting easier or am I getting better in my old age? Found this one easily, but originally wanted to start out playing 28. Ba5 followed by 29. Bxg6. That didn't quite work so I reversed the bishops sacs. Yes!

Did this after a night of drinking (which I seldom do). Maybe I discovered Alekhine secret of having combinational vision! Okay, probably not . . .

Feb-11-12
Premium Chessgames Member
  Patriot: Before attempting to calculate anything, I first looked for what black is threatening and didn't see anything. I didn't even look at material differences (white has the bishop pair).

Then I looked for "elements" or "seeds" (i.e. "seeds of tactical destruction") and noticed that the queen and rook are on the same diagonal and that Ba5 may be possible (even though it looks unsafe), and that Bxg6 looks interesting.

Then I began to calculate. 28.Bxg6 fxg6 29.Qxg6+ Qg7 30.Qxh5 (threatening 31.Rg3) Qxg2#--oops! So I thought, "If I could get the rook to g3 first, black doesn't have this luxury. But is there enough time?" First I decided to take out a potential defender or problem piece, the knight. Since 28.Rg3 Ne2 could be an issue, I decided 28.Bxd4 cxd4 29.Rg3 to threaten 30.Bxg6.

This still looks pretty good to me (at least I'm not seeing a good defense and white is getting at least 3 pawns for a piece plus an attack). But I never considered taking advantage of the seed with the queen and rook on the same diagonal. That's all I got after a few minutes.

Feb-11-12  polarx: Another instance of an "I should have got this" puzzle. Saw the Bxg6 sacrifice and the Ba5 deflection/sacrifice, knew that the rook had to join the attack (and there is no other square than g3). But stopped there. Did not check whether Black had still a defense or the quite Rg3 was the beginning of the end. One is tempted to say that this puzzle was not so difficult after all. Quiet moves, that is the problem.
Feb-11-12
Premium Chessgames Member
  Jimfromprovidence: I tried the 28 Rg3 line as well and found that it was too slow as <Patriot> noted because of 28..Ne2.


click for larger view

I also tried 28.Bxd4 cxd4 29.Rg3 but tht line seems murky after 29...Rd7.


click for larger view

White has 30 Qxh5 but black has 30...Bc4 to set up 31...d3.

Then I found the winning line that those that got it have explained nicely.

Feb-11-12
Premium Chessgames Member
  whiteshark: Hutsch took a lot of punishment.
Feb-11-12  VincentL: "Very Difficult"·

I am sure this involves 28. Bxg6 fxg6 29. Qxg6+ etc. but first I think we need to deflect the black queen from the defence. So I like 28. Ba5 as the first move.

Black must capture in order to avoid losing the exchange, so 28....Qxa5 and then 29. Bxg6.

After 29......fxg6 30. Qxg6+.

If 30.....Kh8 31. Qf6+ Kg8 32. Rg3+ Kh7 33. Qg7#

If 30.....Kf8 31. Qh6+ Ke7 32. Qh7+ Ke8/Ke7 33. Rg3 and black cannot prevent 34. Rg8#

If black declines the second bishop and plays something like 29....Qc7, white continues 30. Rg3 and I donīt think black can avoid mate.

This is what I have seen straight away after looking at the puzzle. Since it is marked "very difficult" I am sure there must be more than this.

But my time is up; letīs check.

Feb-11-12  VincentL: I tried my line against Crafty, and the machine came up with 29.....Nf3+ !. After 30 gxf3 the rookīs path is blocked.

The human sees most defensive resources. The computer sees all.

Feb-11-12  Penguincw: 28.Bxf6 isn't too hard to find, but the follow up might be a little trickier.
Feb-11-12  doubledrooks: The idea is to sacrifice both bishops-first the WSB with 29. Bxg6 and after 29...fxg6 sac the other bishop with 30. Ba5, deflecting the Black queen from defending its King. For example:

30...Qxa5 31. Qxg6+ Kf8 Rg3 and mate is unavoidable.

Best for Black might be 29. Bxg6 Nf3+ 30. Rxf3 Bxf3 31. Bxh5+ Kf8 32. Bxf3, giving White two minor pieces and two pawns for a rook.


click for larger view

Feb-11-12
Premium Chessgames Member
  Marmot PFL: Calculated to the final position quickly, but didn't find the mate after 31...Nf5.
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