< Earlier Kibitzing · PAGE 2 OF 2 ·
|Oct-02-09|| ||Samagonka: This only seemed easy after looking after the solution...|
|Oct-02-09|| ||Chris1Clark: Am I being dumb surely 24. dxc6+ would be better d6+ queen then drops while Rxd1+ gives some compensation and is met with Bc1. I'm sure I am missing something but that was my line and I stopped there.|
|Oct-02-09|| ||randomsac: I saw it today. I figured Rxf7 was forcing since Qxh7 would be mate otherwise.|
|Oct-02-09|| ||goodevans: The key move is 21 Rxf7, which I think was pretty easy to spot. After that there seem to be several ways to win.|
What I had in mind was 21 Rxf7 Kxf7 22 Bc4+ d5 23 Qxh7+ Ke6
24 exd5+ Kd7 25 d6, which looks like a clear win to me (or am I missing something?).
|Oct-02-09|| ||patzer2: White's decoy 21. Rxf7!! drops like a cluster bomb to shatter Black's pawn structure and pursue his King for a mating attack. |
Following the strong and clear followup 22. Bc4+!, it appears Black's King might be safe after 22...d5 23. exd5 Rd8 24. d6+ Ke8.
However, at this point, White surprises him with a second and decisive decoy sham sacrifice in 25. Bf7+!
Now with the Black King exposed and on the run, his two extra pieces are powerless against White's onsalught.
In the final position, it's curtains after 27...Bf6 28. Qxf6#, 27...Ke5 28. Qf5#, or 27...Kd7 28. dxe7+ Kc8 29. exd8Q+ Qxd8 30. Qxc6+ Qc7 31. Rd8#.
|Oct-02-09|| ||patzer2: Forgot to mention that 21. Rxf7!!, in addition to providing an excellent example of a decoy and pursuit combination, also solves today's Friday puzzle.|
|Oct-02-09|| ||johnlspouge: Friday (Difficult):
E Berg vs C C Buhr, 2001 (21.?)
White to play and win.
Material: Even. The Black Kg8 has 3 legal moves, all dark squares, and is vulnerable to 21.Rg6+ and 21.Qxh7+. White has a local superiority in the K-field, with Rf6 and Bg5 occupying the weak dark squares around Kg8. White must spread his attack to light squares to threaten Kg8 seriously. Black threatens 21…Bxf6 22.Bf6, but the White Bf6 might be so powerful in conjunction with Qh3-h8-g7# that the threat of capture is no real threat. If not, White must move Rf6 or find a candidate counter-threat of at least loss of a R. In the long run, the White Rd1 and Bd3 might require activation. The White Kb1 is secured from check.
Candidates (21.): Rxf7
21.Rxf7 (threatening 22.Qxh7#)
Candidates (22.): Qxh7+, Bc4+
[22.Qxh7+ Ke6 and the Black K becomes a slippery fish.]
22.Bc4+ d5 [Kf8 23.Qh6#] [Kg7 23.Qxc3+ and mate soon] [Bd523.Bxd5+, etc.]
Candidates (23.): Qxh7+, Bxd5+, Rxd5
All three candidates look promising, but 23.Rxd5 appears the most difficult to meet.
<[I went for 23.Rxd5, overlooking that after 23…Bxd5+ 24.Kg7, Qc7 now prevents 25.Qc3+.]>
Like <dzechiel>, I recognized the common pattern initiated by 21.Rxf7, effectively deflecting Kg8 so Qxh7+ becomes possible.
|Oct-02-09|| ||LIFE Master AJ: I got as far as move 24, but then I went astray with 25.Re1. (Whicj I am pretty sure will win.) |
RULING: ChessGames, does this count as a solution?
|Oct-02-09|| ||cyclon: Very nice!|
|Oct-02-09|| ||chrisowen: I found it to my pleasure finding Rxf7 Kxf7 Bc4+ d5 exd5 Red8 dxc6+ Ke8 but was then unsure of the Bf7+ or Re1 follow up.|
|Oct-02-09|| ||Jimfromprovidence: 23 Qxh7+ Ke6 24 Qxg6+ Kd7 25 exd5! (threatening Qe6+) is forcing and looks very strong as well.|
click for larger view
|Oct-02-09|| ||BOSTER: Reading many different comments I finally made a little bit strange conclusion.
The most players are able to decide <CG> puzzles, and most solutions have the same way. The difference is: one can find the solutuion immediately, another in couple min. or after a cup of coffee.
What can you expect if about 40% of our puzzles have solution as mate or forced win in 1-4 moves. Because we have nice players like <Johnispouge> who said:<As a seasoned skeptic,I try to assume nothing> I have to prove my suggestion.
M,Sep-28-09 mate in 3 moves.
T, Sep-29-09 win after 1 move.
W,Sep-30-09 forced mate in 5 moves, and this is our typical picture at the beginning of the week.
I was surprised when some players were impressed by the winning combo ( more exectly by the winner), even sometimes the end of game looks like a cooperative mate, and I decided that somebody has to take the looser' side ( who takes a huge part in the building of the constrution which you can see on the diagram) . It would be nice to read his thoughts, his ideas to show how he created such position, or what mistakes he did in the game before you can enjoy the puzzle. Only couple players like <wals> pay attention what mistakes made a looser.
I believe that this is very useful, only one problem is here-we can read <wals>' evaluation when the discussion is almost finished.
Analysing looser' mistakes we can clearly understand how the critical point in the position was created, and try to avoid such mistakes.
|Oct-02-09|| ||gawain: I though I had it when I saw 21 Rf7 and the follow-up Bc4+ but it seemed far too easy. That's because I saw only 22...Kg7 23 Qc3+ and mate next move. |
Yes, I failed to see Black's defense with d5 (or Bd5). That produces complications to work through and makes this an interesting Friday puzzle in spite of the fact that it's messy because there are several ways to win.
It is striking how well-coordinated the White pieces are, and how badly the Black.
|Oct-02-09|| ||BOSTER: Looking at the position you can clealy understand that only the breach in the gate e8-e6 square e6 gives a possibility the King to escape from his cage.
After adventurous attempts like Rxf7 and then Qh7 I decided that timid move Bc4 is much better- to close the exit.-without continuation.|
|Oct-02-09|| ||butilikefur: Oh gosh, after 21. Rxf7 Kxf7 22. Bc4+ d5 23. Qxh7+ Ke6 24. exd5+ Kd7 25. dxc6+ Kxc6 26. Qxg6+ Kc5 the move <27. Rd5+> wins immediately - <27...Kb4 28. a3+ Kxc4 29. Qd3+ mate>|
|Oct-02-09|| ||RandomVisitor: 3 minutes per move:
Emanuel Berg (2500) - CC Buhr (2385)
Bundesliga 2001-2 Hamburg GER (4), 25.11.2001
[Rybka 3 ]
1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Be3 e6 7.f4 Be7 8.Qf3 a6 9.Bd3 Qc7 last book move
10.0-0-0 0.22/16 0-0 0.51/16
[Rybka 3 : 10...Bd7 11.Rhg1 h5 12.h3 Rc8 13.Kb1 b5 14.a3 Rb8 15.Qg3 0-0 16.Nxc6 Bxc6 17.f5 h4= 0.22/16 ]
[Rybka 3 : 11.Nxc6 bxc6 12.g4 Rb8 13.h4 d5 14.g5 dxe4 15.Nxe4 0.51/16 ]
[Rybka 3 : 11...Re8 12.h3 Nxd4 13.Bxd4 e5 14.Be3 exf4 15.Qxf4 Be6 16.Nd5 Qc6 17.c4 Nd7 18.Rhf1 0.26/14 ]
[Rybka 3 : 12.Rhg1 Nxd4 13.Bxd4 e5 14.fxe5 dxe5 15.Qg3 Bd6 16.Be3 Be7 17.Bh6 Nh5 18.Nd5 Nxg3 19.Nxc7 Bc5 20.Nxa8 Bxg1 21.Rxg1 Rxa8 22.Bg5 Nh5 23.Rf1 Bb5 24.c4 Bc6 25.Rf5 0.48/16 ]
13.Bxd4 0.23/16 Bc6 0.82/15
[Rybka 3 : 13...e5 14.fxe5 dxe5 15.Qg3 Bd6 16.Be3 Be6 17.Rhf1 Nd7 18.Qf3 Nc5 19.Nd5 Bxd5 20.exd5 Nxd3 21.Rxd3 Qd7 22.Qe4 f6= 0.23/16 ]
14.Qh3 0.61/17 e5 0.73/19
15.Be3 0.73/17 exf4 0.85/17
16.Bxf4 0.64/16 g6 1.05/17
[Rybka 3 : 16...Qc8 17.Rhg1 g6 18.Qg2 b5 19.g5 Nd7 20.h4 Ne5 21.Nd5 Bxd5 22.exd5 Qd7 23.h5 Rae8 24.Bxe5 dxe5 25.Rh1 0.64/16 ]
[Rybka 3 : 17.g5 Qd7 18.Qg2 Nh5 19.Be3 Qe6 20.Be2 f5 21.Rhe1 Ng7 22.Bf3 f4 23.Bd4 Qf7 24.h4 Ne6 25.Bg1 Rac8 1.05/17 ]
[Rybka 3 : 17...Qd7 18.Bh6 Qxg4 19.Qe3 Qe6 20.Bxf8 Rxf8 21.Qd4 Qe5 22.Bc4 Nd7 23.Bd5 Qxd4 24.Rxd4 Kg7 25.Bxc6 bxc6 26.Rc4 Ne5 27.Ra4 Ra8 28.Ne2 a5 29.Rd1 h5 30.h3 Nd7 0.58/22 ]
18.Bh6 0.98/17 Rfe8 2.28/17
[Rybka 3 : 18...Nd7 19.Bxf8 Rxf8 20.Nd5 Bxd5 21.exd5 Bf6 22.c3 Qb7 23.Bc2 b4 24.c4 Bd8 25.Qg3 Qc7 26.g5 Ne5 27.Rf4 Qd7 28.Qh4 0.98/17 ]
19.Bg5 2.28/16 b4 2.96/17
20.Rxf6 2.86/15 bxc3? 6.58/13
[Rybka 3 : 20...Bxf6 21.Bxf6 Re6 22.g5 h5 23.Nd5 Qb7 24.Nf4 Rxe4 25.Nxh5 Qc8 26.Qxc8+ Rxc8 27.Ng3 Re3 28.Bd4 Re7 29.Bxa6 Rce8 30.c3 Re1 31.Rxe1 Rxe1+ 32.Kc2 bxc3 33.Kxc3 Ra1 34.Bc4 2.86/15 ]
21.Rxf7 6.50/14 Kxf7 6.44/13
22.Bc4+ 6.23/14 d5? 10.98/12
[Rybka 3 : 22...Bd5 23.Rf1+ 6.23/14 ]
23.exd5 10.65/12 Red8? #6/4
[Rybka 3 : 23...Bxg5 24.Qxh7+ 10.65/12 ]
24.dxc6+ #6/4 Ke8 #5/3
25.Bf7+ #5/3 Kxf7 #3/3
26.Qxh7+ #3/3 Ke6 #2/3
27.Qxg6+ #2/3 1-0
|Oct-02-09|| ||butilikefur: lol. hey <onesax> look up.|
|Oct-02-09|| ||butilikefur: In the main line White should play <29. Qxe8+ Bd8> (29...Qd8 30. Qc6 mates quickly) <30. Bf4 Qxf4 31. Qxd8+ Ka7 32. Qxa8+ Kb6 33. Qc6+ Ka5 34. Qc5+ Ka4 35. Bb3+> mate. So, Black has to play <28...Bc5 29. Bxc5 Qxc5 30. Bxa8 Qb5 31. b3> with White simply up a piece - 31...Rxa8 32. Qg7+ Kb6 33. Rd6+ Ka5 34. Qxc7+ will mate.|
|Oct-02-09|| ||tivrfoa: nice mate|
|Oct-02-09|| ||YouRang: I pretty much got it. :-)
Leaping to the eye (okay, sort of a slow leap) is 21.Rxf7 -- threatening Qxh7#, thus forcing 21...Kxf7 which exposes the black king and leaves Ph7 unguarded.
Now we want to give check without allowing the king escape through e6, so 22.Bc4+ d5 23.exd5. I threaten d6+ (winning the queen) and a nasty looking attack with Qxh7+/Rf1 -- I don't see any good way out for black.
|Oct-02-09|| ||muralman: I got this one all the way to the resign. It was lots of fun, because I was sure of all my moves. There was some urgency to keep the king under attack because of the white king being quite vulnerable to checkmate. clearing the way for the white square bishop was necessary. I was taken aback by the message about an equally good attack. I didn't see that one through. |
This is my kind of puzzle. Chess skill and experience I have none. I am at a loss when theory is needed.
I am thinking I ought to learn a few openings.
|Oct-02-09|| ||WhiteRook48: I tried e5 with the intent of Qxh7+|
|Oct-02-09|| ||A Karpov Fan: I thought 23. Qxh7+, but the first two moves destroy Black's position anyway.|
|Oct-02-09|| ||patzer2: Correction to my initial post today: In the final position, 27...Kd7 is impossible as it moves the King into check. Don't know how I hallucinated and came up with a variation there.|
After the decoy 25. Bxf7+! Kxf7, White has several easy mate-in-four possibilities after 26. Qxh7+ (see <RV>'s post of Rybka 3 analysis).
The difficulty in the combination is seeing the initial 21. Rxf7!!, the follow-up 22. Bc4+! (for me the alternative given by CG.com is too much for OTB visualization) and the second decoy sacrfice 25. Bf7+! After that the mates are simple to calculate.
Of course trying to visualize multiple four-move mates six moves in advance (or 9 moves in advance if you calculate all the way to mate here) is not so easy.
P.S.: This combination IMO could be a good example for teaching how to calculate multiple forced mate variations. Start with the simple two three and four-move mates toward the end of the combination. Then progressively work backwards to the 25. Bf7+! decoy sacrifice and so on, until the student(s) can see the whole combination after 21. Rxf7+!!
|Oct-03-09|| ||TheBish: E Berg vs C C Buhr, 2001|
White to play (21.?) "Difficult"
Material is even. Candidate moves: 21. Rxf7 looks very strong and forcing.
21. Rxf7!! Kxf7 (Black also loses after 21...h5 22. Bc4 d5 23. exd5 Kxf7 24. d6+) 22. Bc4+!
The king must not be allowed to escape to e6!
Not 23...Kf8?? 24. B(Q)h6# or 23...Kg7?? 24. Qxc3+ and mate next move. Also, 23...Bd5 24. Bxd5+ Kg7 25. Bxe7 Qxe7 26. Qxc3+ Qe5 27. Qxe5 dxe5 28. Bxa8 Rxa8 29. g5! wins easily for White.
24. exd5 and now:
A) 24...Bxd5 25. Qxh7+ Ke6 (Kf8 26. Bh6#) 26. Qxg6+! Kd7 (or 26...Bf6 27. Qxf6+ Kd7 28. Qf5+! Re6 28. Bxd5) 27. Bxd5!, and Black loses after 27...Bd6 28. Qf5+ or 27...Bxg5 28. Bc6+ Ke7 29. Qg7+, winning the queen.
B) 24...Red8 25. dxc6+ (Black has some life after 25. d6+ Ke8 26. dxc7 Rxd1+ 27. Bc1 Bg5) Ke8 26. Bf7+! (bring the black monarch out of hiding!) Kxf7 (26...Kf8 27. Qh6+ forces a transposition) 27. Qxh7+ and now:
B1) 27...Ke6 28. Qxg6+ and mate next move with 28...Ke5 29. Qf5# or 28...Bf6 29. Qxf6#.
B2) 27...Kf8 28. Bh6+ Ke8 29. Qg8+ Bf8 30. Qxf8#.
B3) 27...Ke8 28. Qxg6+ Kf8 29. Bh6#.
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