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|Jul-07-15|| ||DrGridlock: <tigerngm: May not be as deep as DrGridlock thinks?
25 ... Kh8. 26 Nxf5 Bxf5 27. Nf7+ forking and wining the black queen.>|
That's a nice variation if black accommodates the fork by playing Bxf5 on move 26. Of course there is no need to be so accommodating as things get trickier if Black plays 26 ... Qf8 instead.
|Jul-07-15|| ||agb2002: White has a bishop, a knight and a pawn for the bishop pair.|
Black threatens 24... Qxc7 and 24... bxa4.
White can win material with 24.Rxg7+
A) 24... Kxg7 25.Qg5+
A.1) 25... Kf8 26.Qxf6+
A.1.a) 26... Ke8 27.Nxf5 Bxf5 (due to 28.Ng7#) 28.Qf7+ Kd8 29.Qxf5 + - [B+N+2P vs R], with many threats (Nf7+, Qxh7, axb5, Bxd5-Qxd5-Nf7+, etc.).
A.1.b) 26... Kg8 27.Nxf5 Bxf5 (due to 28.Qg7#, 28.Nh6#, etc.) 28.Qf7+ Kh8 29.Qxf5
A.1.b.i) 29... Kg8 30.Qg5+ (30.Bxd5+ Qxd5 31.Qg5+ Rg6) 30... Qg6 (30... Kh8 31.Nf7#) 31.Nxg6, etc.
A.1.b.ii) 29... Qe7 30.Bxd5 + - [B+N+3P vs R].
A.1.b.iii) 29... Qe6 30.Qxe6 Rxe6 31.Bxd5 wins a piece and several pawns, for example, 31... Rae8 32.Bxe6 Rxe6 33.Rf8+ Kg7 34.Rf7+ Kg8 35.Rxa7 bxa4 36.bxa4, etc.
A.1.c) 26... Bf7 27.Qxf7#.
A.2) 25... Kh8 26.Qxf6+ Kg8 transposes to A.1.b.
B) 24... Kf8 25.Qh6 Ng8 (25... Ng4 26.Rxg4+, etc.) 26.Qxh7 and the threat Rf7+ wins.
C) 24... Kh8 25.Qh6 and mate next.
|Jul-07-15|| ||consul: <DrGridlock>, could you kindly give us some practical lines? Thanks!
This is a Tuesday puzzle, and as such it is supposed to be quite easy and shallow. Tricky combinations are usually left for later days of the week.|
|Jul-07-15|| ||Shoukhath007: Amazing chess games of wesley sov watch it amazing sacrifices.
|Jul-07-15|| ||DrGridlock: <agb> does a pretty through job above.|
I agree that this puzzle has more turns than normal for a Tuesday.
When I was solving it, I found the Rxg7, Qg5 and Qxf6+ (after both Kh8 and Kf8). At that point, even though I couldn't find a forced mate or larger material gain, the position "looked" winning, and White has "spent" a rook to gain a knight and bishop. I would have played this line over-the-board, since there's no material risk and it "looks" right. If my calculation skills were better, I would push beyond "looking" right and find the concrete variations with the larger advantages.
After those steps, I looked at the position on a computer, and found the exact continuations - which contain much more subtleties than are typical in a Tuesday puzzle.
|Jul-07-15|| ||diagonalley: <DrGridlock> agreed.|
|Jul-07-15|| ||stacase: |
That was easy.
|Jul-07-15|| ||gofer: Okay, we have quite a long combination to work out...|
24 Rxg7+ Kxg7 (Kh8/Kf8 Qh6 looks bad for black)
25 Qg5+ Kf8 (Kh8 26 Qxf6+ Kg8 27 Qg5 transposes)
26 Qxf6+ ...
Okay, so we are winning, but how do we win quickly?! There must be something
<24 Rxg7+ Kxg7>
<25 Rxf5! ...>
White avoids the humdrum Qg5+ in favour of a massive attack!
25 ... Bxf5
26 Nxf5+ Kf8
27 Qh6+ Ke8
28 Nxd6 Rxd6
25 ... Bf7
26 Qg5+ Bg6
25 ... Nd4
<25 ... Rf8>
<26 Qg5+ Kh8>
<27 Nhg6+ hxg6>
<28 Nxg6+ Kh7>
<29 Nxf8+ Qxf8>
<30 Rxf6+ Qg7>
<31 Qh4+ Kg8>
<32 Rxe6 Rxe6>
<33 Bxd5 >
click for larger view
Now this all seems a little "obvious" for a Tuesday, perhaps the 10 move
combination should have been on a Monday...
Hmmm, does <25 Rxf5> hold water? It looks much more fun that the boring <25 Qg5+>...
|Jul-07-15|| ||Steve.Patzer: I must look at 25. Rxf5|
|Jul-07-15|| ||Lambda: You don't need to see Nxf5. Winning two pieces for a rook and creating a promising-looking attack is more than enough justification to just play it, and only think again when that position is in front of you.|
|Jul-07-15|| ||morfishine: <24.Rxg7+> forcing 24...Kxg7 25.Qg5+ Now on either 25...Kh8 or 25...Kf8 26.Qxf6+ and White has two minors for the rook|
After that, White crashes through at <f5>
|Jul-07-15|| ||Eduardo Leon: <24.♖xg7+ ♔xg7 25.♕g5+ ♔f8 26.♕xf6+ ♔g8>|
26...♔e8 27.♘xf5 ♗xf5 28.♕f7+ ♔d8 29.♕g8+, and white wins even more material.
<27.♘xf5 ♗xf5 28.♕f7+ ♔h8 29.♕xf5>
And white's threats against the black king are absolutely deadly.
|Jul-07-15|| ||zb2cr: Found 24. Rxg7+, Kxg7; 25. Qg5+ easily. Whether the Black King moves to h8 or f8, White replies 26. Qxf6+, and ends up with 2N+P vs. a R and a promising-looking attack.|
|Jul-07-15|| ||patzer2: <Jul-07-15 Lambda: You don't need to see Nxf5. Winning two pieces for a rook and creating a promising-looking attack is more than enough justification to just play it, and only think again when that position is in front of you.> That was pretty much it for me when I visualized 24. Rxg7+! Kxg7 25. Qg5+ Kh8 (25... Kf8 26. Qxf6+ ) Ke8 27. Nxf5 Bxf5 28. Qxf5 for my Tuesday solution.|
But I didn't realize just how powerful the mating attack was until I plugged it into the computer.
Playing it out using Deep Fritz 14 in analysis mode reveals a more complete solution after 24. Rxg7+ Kxg7 25. Qg5+ Kh8 (25... Kf8 26. Qxf6+ Ke8 27. Nxf5 Bxf5 28. Qxf5 bxa4 29. Qf7+ Kd8 30. Qg8+ Kc7 31. Qxa8 ) 26. Qxf6+ Kg8 27. Nxf5 Bxf5 28. Qxf5 Rf8 (28... bxa4 29.Qg5+ Kh8 30. Nf7#) 29. Qg5+ Kh8 30. Nf7+ Rxf7 31. Rxf7 Qg6 32. Qe5+ Rf6 33.Rxf6 Kg7 34. Rf4+ Kg8 35. Bxd5+ Qf7 36. Rxf7 bxa4 37. Rf1#.
P.S.: For a future Sunday level puzzle, 15. Nxf7!! would be a good choice. If 15... Kxf7, White wins after 16. Ng5+ Ke7 17. Nxe6
Nxe6 18. dxe5 Bxe5 19. Bxd5 Qb6 20. Ba3+ Kf7 21. Bc4 a6 22. e4 Bg7 23. Qg5 Bf6 24. Qh6 Bg7 25. Qh4 Nf6 26. e5 h5 27. exf6 Bxf6 28. Qe4 (+10.03 @ 20 depth, Deep Fritz 14).
|Jul-07-15|| ||patzer2: For an improvement for Black, I prefer the more popular try 3... e6 when play might go 4. g3 Be7 5. Bg2 O-O 6. O-O c5 = as in Nakamura vs Topalov, 2015. |
White won that Blitz game, but Black had a nice set up with full equality within the first 10 moves. It was only after a few inaccuracies later on (as frequently occur in fast time control games) that White took control and won.
|Jul-07-15|| ||Penguincw: Has anyone come across the situation where they start solving a puzzle, and then just stop solving (ex. get distracted)?|
That happened to me, but to my relief, 24.Rxg7+ Kxg7 25.Qg5+ were the only moves I came up with, and those were the only moves played. However, a followup of 26.Qxf6+ looks good.
|Jul-07-15|| ||fporretto: To me, the puzzle is why Black didn't resign at about move 16.|
|Jul-07-15|| ||chrisowen: Muppet c7 takes an down g7 at win mind success hove in |
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|Jul-07-15|| ||kevin86: The exchange sac is followed by a queen check and brutal follow ups.|
|Jul-07-15|| ||whiteshark: The operation is really easy-peasy. (:D|
|Jul-07-15|| ||DrGridlock: <White avoids the humdrum Qg5+ in favour of a massive attack!|
25 ... Bxf5 >
And what if black plays h6 instead of Bxf5?
Both Qg5 and Rxf5 are winning, but the attack after "humdrum" Qg5 is certainly more "massive" than that after Rxf5.
|Jul-07-15|| ||morfishine: Thanks <DrGridlock> I much enjoyed reading your posts today. There are many interesting variations!|
|Jul-07-15|| ||starry2013: Eventually I got a conclusive win. Took long enough|
1.Rxg7+ Kxg7 2.g4 Ne4 3.Bxe4 dxe4 4.gxf5 Bxb3 5.f6+ Kh8 6.Qh6 Qc7 7.Nhg6+ Kg8 8.Ne7+ Qxe7 9.Qg5+ Kh8 10.fxe7 Rg8 11.Qxg8+ Bxg8 12.e8=Q h5 13.Rf8 Kh7 14.Rxg8 bxa4 15.Rg6 Rxg6+ 16.Qxg6+ Kh8 17.Nf7#
I always saw the rook sacrifice to start off but couldn't get a good continuation for a while, looking to get the queen in for the check when it didn't work for me.
|Jul-07-15|| ||Cheapo by the Dozen: I just got to two pieces and a pawn or two for the rook.|
|Jul-07-15|| ||morfishine: <starry2013> As long as you found the way, thats all that matters! Happy, Chess!|
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