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| Dec-20-14 | | mistreaver: Saturday. White to play. Very Difficult. 24.?
White has excellent attacking position, the only piece not participating being the rook on f1.
Very tempting is sacrifice on g6. But with what piece?
Let's first try with the bishop
24 Bxg6 fxg6 (forced)
25 Rxg6+
and now
A)
25 ... Kf7
26 Rg7+ Ke6
27 Qf5 seems like mate
B)
25 ... hxg6 (this seems critical)
26 Qh8+ Kf7
27 Qh7+ Ke6
28 Qxg6+ Nf6
29 Qxf6+ Kd5
30 Qf3+ Ke6
31 Re1
And i will terminate my calculation here, hoping that Alekhine's postulate about long variations and holes in
them isn't correct.
Time to check and see.
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It was pretty forcing and therefore not that hard to calculate up to 31 Re1, but i failed to take account the 31... Bb4 resource.
And i have to admit i didn't immediately see why 32 d5! wins, and i wanted just to move the rook to e2 and e3. Computer says it is even stronger, but d5 is pretty human and effective way to finish. |
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| Dec-20-14 | | TheaN: Saturday 20 December 2014 <24.?> Almost all white pieces are gathered on the black king side (with the exception of Rf1). In exchange, black has an additional pawn that is already quite far up the board (c4). Black tried to bring the majority of his pieces back to defense. If white doesn't fire a shot now he has to retreat his queen, severely weakening the attack. This suggests a breakthrough. The straightforward 24.Qxh7+? Kxh7 25.Rh5+ Bh6 (Kg8 26.Rh8#)  does not work, so white has to directly break on g6: <24.Bxg6!>. Black cannot really decline this and the upcoming sacrifice because he can't defend against so many pieces. White is immediately threatening Bxf7#: stressing the dark squared bishop <24....f6, Nf6 or Rxe5<>> leads to <25.Bxf7++ Kh8 26.Rg8#<>> which shows the power of double check. Freeing f8 by moving the bishop to anything else but h6 leads to <24....B=/h6 25.Qxh7+ Kf8 26.Qg7+ Ke7 27.Qxf7#<>>. <24....Bh6?<>> is no immediate mate after <25.Bxf7++ 26.Qxh6+ Ke7 (Kxf7 27.Rg7+ Kf8 28.Rxd7+ Kg8 29.Qg7#) 27.Bxe8  <>> but it will be soon, and black is down a rook and two pawns at least. So, <24....fxg6 (hxg6 25.Qh8#)>. Now white fires the second battering ram <25.Rxg6+!>. Same deal here, declining is no decent option with even less options. <25....Kf7? 26.Qxh7+ Bg7 27.Qxg7#<>>, <25....Qg7?<>> is inferior to <25....Bg7? 26.Rxg7+ Qxg7 26.Bxg7 Kxg7 27.Rb1 b6 28.Rb5 <>> and white's material advantage will win regardless of the c-pawn. So, <25....hxg6>. This is of course the point of the combination. White sacrifices a rook and bishop to open up the so crucial h-file. 26.Qxg6+? Bg7 is certainly not the type of defense white wants, so <26.Qh8+ Kf7 27.Qh7+ Ke6 (Bg7 28.Qxg7+) 28.Qxg6+> the black king is now in the center with no real space to move. Black can create an escape square with <28....Nf6<>> but after <29.Qxf6+ Kd5 30.Qf3+! Ke6<>> it didn't do much. <28....Ke7>. Now the point, white activates his last piece <29.Re1>. The threat is 30.Bd6# and moving the bishop does not help. Moving the knight allows 30.Qf6#. Moving the d8-rook allows 30.Bc7+ Ne3 31.Rxe3+ Qe6 32.Qe6#. So the only options black has left is to move the queen. After <29....Qxa4 30.Qf5!!> black leaves the so crucial d7 square to the white queen, threatening Bc7+ with mate. <30....Ne3 31.Rxe3 Qd1+ 32.Kh2<>> doesn't help. <30....Bh6 31.Bf4+ Ne3 32.Rxe3#<>>. <30....Rd7 31.Bc7+ Ne3 32.Rxe3#<>>. Only <30....Rd6> defends: <31.Bxd6+ Kxd6 32.Qg6+ > loses pretty much all material black has left, and white will go a rook up. Woah, long post. |
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Dec-20-14
 | | Penguincw: As soon as I saw this position, the game Fischer vs Myagmarsuren, 1967 came in to mind (kinda), but after 24.Qxh7+ Kxh7 25.Rh5+, 25...Bh6 and white is doomed. |
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| Dec-20-14 | | TheaN: Immediately tried the line into a silicon monster. Rybka gives the line <24.Bxg6> as 0 because <24....fxg6 25.Rxg6+ hxg6 26.Qh8+ Kf7 27.Qh7+ Ke6 28.Qxg6+ Ke7=>, now <29.Re1 Qxa4!> is in fact alright as my hard to spot <30.Qf5?!> does in fact fail to my proposed <30....Rd6!>: I should have calculated further, because <31.Bxd6+? Kxd6 32.Qg6+> which everything I posted, is in fact worse for white after <32....Kc7! 33.Rxe8> and black has time to save his pieces. Two pieces and a passed pawn versus a rook is good for black. So far, it seems the sacs on g6 only <draw> for white, but any other 24th move is worse. |
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| Dec-20-14 | | TheaN: If white decides to play 29.Re1, after 29....Qxa4 he is best off to draw with 30.Qh7+. The position is very hard to defend for black, but as the position simplifies more options become available. Later into the combination white must realize it doesn't win, but in the game black errored with 28....Nf6? which is a counterintuitive move, in my opinion. |
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| Dec-20-14 | | mistreaver: <Puzzle: direct mate combination: Qxh7+ Kxh7, Rh5+ Kh8 Kh8++. Beatifull, but easy to see.>
No it isn't, black has Bh6 and you can resign |
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| Dec-20-14 | | Edeltalent: 24.? White to move
White has sacrificed a pawn to get a menacing position against the black King. He can't waste too much time though becaues Black is planning to consolidate with Bg7 or even f6. A typical (Monday-like) solution would be 24.Qxh7+ Kxh7 25.Rh5+ Kg8 26.Rh8#, but it's refuted by 25...Bh6. The next very forcing line to look at is 24.Bxg6 fxg6 25.Rxg6+ hxg6 26.Qh8+ Kf7 27.Qh7+ Ke6 28.Qxg6+ Nf6.
click for larger viewQueen and Bishop can't mate the king alone, so at some point White will have to let the Rook join the attack with Re1. Sometimes it's a good idea to play such a move directly and keep all options (e.g. taking on f6 with the Queen or the Bishop), only deciding how exactly to proceed after the defender commits in some way with his reply. However in this case, I have trouble dealing with the coldblooded reply 26. Re1 c3, opening up the path to c4 for the black King, e.g. 27.Qxf6+ Kd5 28.Qf3+ Kc4 29.Rc1 Bb4 and ("strangely enough", as Kramnik would say) Black seems to survive.
click for larger viewThus from the first diagram we instead continue with forcing moves: 29.Qxf6+ Kd5 30.Qf3+ Ke6 31.Re1 Bb4 32.Re2. Now the King has nowhere to run. The nicely centralized black Rooks look extremely stupid, helplessly watching him from behind. The only escape square is d7, so the Queen has to move out of the way. It turns out her ideal square would be b5, but that's taken away by the unconspicuous pawn on a4, so whatever she does, she has to give up the protection of a key square or her own life, e.g. 32...Qd5 33.Bg3+ Kd7 34.Qxd5+ or 32...Qh7 33.Bg3+ Kd7 34.Qxb7#. 32...Qc6 gave me the most trouble to calculate until I found 33.Qf5+ Re6 34.d5 and Black's position falls apart.
click for larger view |
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| Dec-20-14 | | Marmot PFL: Found most of these moves, but not the win. Seems others had the same problem. |
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| Dec-20-14 | | Edeltalent: I thought I had it completely figured out, while I in fact completely missed 28...Ke7 (presumably because this square was still covered by the Queen on the previous move. Although 29.Re1 then looks obvious and crushing, this is sloppy calculation. |
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| Dec-20-14 | | Moszkowski012273: Nice analysis <TheaN>...... |
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Dec-20-14
 | | kevin86: The black bishop prevents the easy mate in three by queen sac, but a king hunt will give white the victory. The sacrifices are smaller but no less rewarding. |
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Dec-20-14
 | | agb2002: White has the bishop pair for a bishop, a knight and a pawn. The first idea that comes to mind is 24.Bxg6 fxg6 (24... hxg6 25.Qh8#; 24... f6 25.Bf7+ Kh8 26.Rg8#) 25.Rxg6+ hxg6 (25... Kf7 26.Qxh7+ Bg7 27.Qxg7#; 25... Bg7 26.Rxg7+ Qxg7 27.Bxg7 + - [Q+P vs R+N]) 26.Qh8+ Kf7 27.Qh7+ Ke6 28.Qxg6+ Ke7 29.Re1 (threatens 30.Bd6#) but I'm not sure if this wins for White. I don't have time for more today. |
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| Dec-20-14 | | TheaN: Just for the record, for people that don't want to read through all my analysis, <28....Ke7=> is a draw by repetition. All of white's tries go astray, of which <29.Re1 Qxa4!> is the most prominent. I still see people talk about a win after 29.Re1, but it is not. |
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| Dec-20-14 | | Yopo: What's wrong with 24 Qxh7+ Kxh7 25 Rh5+ Kg8 26 Rh8checkmate? |
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Dec-20-14
 | | Gregor Samsa Mendel: <Yopo>--24 Qxh7+ Kh7 25 Rh5+ Bh6. |
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Dec-20-14
 | | Richard Taylor: Good combo / attack which I failed to find. Should have been fairly obvious but thought it might start with f4 as the Q sac didn't work. I rejected the Bxg6 without reconsidering it. I think OTB it is easier as you are attacking and have a plan leading up to an assault on the King. It helps to have 2400 odd rating points of course... |
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Dec-20-14
| | Richard Taylor: It just shows you can win a brilliant game from what is reputed to be a boring opening. It proves that you can win no matter what you play in the opening. As black or white.... |
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Dec-20-14
| | Richard Taylor: Well my "engine" finds a draw or equality for black with the right defence. Hard perhaps to find over the board though I suppose. After 28. ... Ke7 Black seems to hold the position.
Here's the proof that white won by a swindle:
After 24. Bxg6 (the best move) fxg6 25. Rxg6+ hxg6 26. Qh8+ Kf7 27. Qh7+ Ke6 28. Qxg6+ Ke7 29. Re1 Qxa4 30. Qh7+ Ke6 31. Bc7+ Ne3 32. Rxe3+ Kd5 33. Qh5+ Kc6 34. Rxe8 Qa1+ 35. Kh2 Rxe8 36. Qxe8+ Kxc7 37. Qxf8 Qxd4 The position is clearly equal. 28. ... Nf6 was an error leading to black's loss of the game. |
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Dec-20-14
 | | Jimfromprovidence: <TheaN> <All of white's tries go astray, of which <29.Re1 Qxa4!> is the most prominent. I still see people talk about a win after 29.Re1, but it is not.> True, but there is a more game left after 30 Qh7+ Ke6 Bf4+!?. 
click for larger viewBlack's knight saves him with 31...Ne3, creating a safe square at d5. 
click for larger viewFor those interested, the question is how white salvages the position from this point onward. |
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Dec-20-14
| | Richard Taylor: < Jimfromprovidence: <TheaN> <All of white's tries go astray, of which <29.Re1 Qxa4!> is the most prominent. I still see people talk about a win after 29.Re1, but it is not.>> It is true after the fact, but in a real game most players would probably fold, or might well do so under pressure from white's attack. This is in a sense what we might call a 'true' sacrifice by black. A mix of calculation and intuition and a desire to win. It worked. Such is chess. |
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| Dec-20-14 | | Cheapo by the Dozen: Well, like many folks I saw the first five moves but not the win after those. I'm glad to see the analysis indicating there wasn't actually a win to miss. |
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Dec-21-14
 | | al wazir: <Abdel Irada: <31...Qc6. Now what?> I suppose 32. Bg3+, Kd7 33. Qf5+, Re6 34. d5 should suffice.<<>>> Yes, that works. Thanks. |
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| Dec-21-14 | | CHESSTTCAMPS: Black's king-side is weakened on the dark squares and white has mobilized substantially in that region to exploit that weakness, expending a pawn in the process. Looking at forcing breakthroughs, 24.Qxh7+?? Kxh7 25.Rh5+ Kg8?? 26.Rh8# works beautifully, but 25... Bh6 leaves white with no good continuation. Next to examine is the pawn-shelter clearing 24.Bxg6!!. It isn't hard to see that black's bunched major pieces do not defend the king from checks from the right. It is easy to foresee at least a draw, but working out a win is much more effort. Here goes! 24.Bxg6!! fxg6 (hxg6? 25.Qh8#; or h6 25.Bf7+ Kh7 26.Qg6#) 25.Rxg6+! hxg6 26.Qh8+ (Qg6+?? Bg7) Kf7 27.Qh7+ and now: A) 27... Ke6 28.Qxg6+ Ke7 29.Re1! (threatening Bd6#) Qe6 30.Qh7+ Qf7 31.Bc7+ Kd7 32.Qxf7+ wins A.1) 28... Nf6 29.Qxf6+ Kd5 30.Qf3+ Ke6 31.Re1! (Threatening 32.Bc7#. The draw 31.Qf6+ is available if white is not confident of the advantage) and now: A.1.1 31... Qe7|f7|g7|h7 32.Bb8+ Kd7 33.Qxg7#
A.1.2 31... Qd5 32.Bb8+ Kd7 33.Qxd5+ Kc8 34.Rxe8 wins
A.1.3 31... Qd6 32.Bxd6+ wins
A.1.4 31... Qc6 33.d5+! Rxd5 (Qxd5 34.Bg3+ Kd7 35.Qxd5+ wins) 34.Bg3+ Kd7 35.Qf7+ wins
A.1.5 31... Qc8 32.Bg3+ Kd7 33.Qf5+ Kc6 34.Qb5#
B) 28... Bg7 29.Qxg7+ Ke6 30.Qg6+ Ke7 31.Re1 Kf8 32.Bd6+! Ne7 (Qxd6 33.Rxd8+ Rxd8 34.Qxd6+) 33.Qf6+ Kg8 34.Bxe7 Qxd4 (Re8 35.Qg6+ Kh8 36.Bf6+ wins) 35.Qg6+ Qg7 36.Qxg7+ Kxg7 37.Bxd8 wins B.1 31... Rmoves 32.Bd6#
OK, I know there's more, but I think that covers much of the solution. Time to post and review. |
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| Dec-24-14 | | Yopo: <Gregor Samsa Mendel>
Thank you. Now, I can see. |
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Dec-10-19
 | | FSR: Blame it on Rio. |
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Kibitzing
+ sac: 24.Bxg6