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Later Kibitzing> |
Feb-19-10
 | | scormus: Let's try it blind again. 36. Bxf5 gxf5 37. Rxf5+ Kg8 38 Rg1 Rb7 39 Qf2 looks promising. What could black do instead? if 37 ... Bf6 38 Qh4, if 38 ... Bf6 39 Qf2. If I'm right its a lot easier than yesterday, Of course black does have to take the B but that's no fun |
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Feb-19-10
| | scormus: Wow, first round TKO! but I meant <doesn't have to take the B ..> |
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| Feb-19-10 | | stacase: <nuwanda - strange "difficult" puzzle, is there anybody out there, who would not play 36.Bxf5 ?> I didn't seriously consider any other move. |
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| Feb-19-10 | | zb2cr: <David2009>,
If you look back at my original posts one page 1, you will note that my initial (admittedly sloppy) analysis of 37. ... Bf6 fell into exactly the same careless line as you did. I spotted it myself later and posted a correction. |
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| Feb-19-10 | | desiobu: 36. Bxf5 is simple enough, but finding the rest was a bit trickier for me. |
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| Feb-19-10 | | Patriot: <<nuwanda>: strange "difficult" puzzle, is there anybody out there, who would not play 36.Bxf5 ?> OTB I would probably play it with even less analysis than what I spent on this as a puzzle. Materially black is slightly better by about .25 pawns, but the fact that white gains the initiative means something in an otherwise close to equal game. Usually that's a sign that you should just play it as a learning process. |
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| Feb-19-10 | | lost in space: Too easy for a Friday, saw it in 5 seconds.
The last 4,5 to find 38. Rg1 |
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| Feb-19-10 | | CHESSTTCAMPS: White has rook for a knight and two pawns, but his big advantage is that the white king is safe behind a solid pawn shield, whereas the black kingside pawn shield is brittle. The sac on f5 is hollering to be played, and relatively little calculation is needed to establish its soundness: 36.Bxf5!
Even though the LSB is strong, white's majors are even stronger, controlling all kingside files. All black defenses are put down easily, starting with sac declines first: A) 36... e4 37.Bxg6+ Bf6 38.Qg5 wins
A.1) 37... Kg8 38.Bf7+ Kf8 (Kh7/h8 39.Rh1+ forces mate) 39.BxN+ eliminates the mate threat and wins. B) 36... Ke8 37.Bxg6+ Kd7 38.Rf7+ wins.
C) 36... Kg8 37.Be6+ followed by Rh1+.
D) 36... Bf6 37.Bxg6 Kg8 (otherwise 38.Qg5) 38.Qg4 Re8 (otherwise 39.Qe6+) 39.d7 Rd8 40.Qe6+ forces mate. D.1) 37... Ne3 38.Qxe3 Qxg6 39.Qxe5 with an easy win. E) 36...gxf5 37.Rxf5+ Bf6 38.Qf2 Kf7 39.Rf1 Nxd6 40.Rxf6+ Ke7 41.Qxc5 Rd8 42.Qxe5+ wins E.1) 37... Kg8 38.Qf2 and the threat of Rg1 can't be defended. E.2) 38... e4 39.Rxf6+ Ke8 (Kg8 40.Rg1) 40.Re6+ Kd8 (Kd7 41.Re7+) 41.Qh4+ Kf8 42.Re8+ Kb7|d7 43.Re7+ wins E.3) 38... Ke8 39.Rxf6 Rb7 (Ne3 40.Re6+) 40.d7+ Rxd7 41.Rxd7 Qxd7 42.Rf8+ wins. Time to see what happened... |
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| Feb-19-10 | | CHESSTTCAMPS: The immediate 38.Rg1 is certainly quicker than my E.1 line. |
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| Feb-19-10 | | patzer2: An even better improvement for Black than 19...Nc4 = is 19...Bh4!, when play might continue 20. Qh2 (not 20. Qxh4?? Qxc2+ 21. Ka1 Qxd1  ) 20...Nc4  (-1.18 @18 depth per Fritz 10) with a clear and strong advantage. |
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| Feb-19-10 | | patzer2: If 37... Bf6, one winning possibility is 38. Qf3 Kf7 39. Qd5+ Kg6 40. Qe6 Ne3 41. Rg1+ Kh7 42. Rh1+ Qh6 43. Qf7+ Bg7 44. Rxh6+ Kxh6 45. Rh5#. |
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Feb-19-10
 | | chrisowen: Not the wild hunt's i thought it was. As black Ioannis opens a small window and like a ray of sunshine the folks role in rearranging the
position.. bxf5 gxf5 rxf5+ leaves Stavriankis blue faced. The iron claws scatter his children.. Kg8 rook g1 which it ganes the queen lest her bishop steps in 37..Bf6 38.Qf3. The dark horse is comic and cannot give him hell, boy the nack is keeping the c-file not shut. |
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| Feb-19-10 | | stukkenjager: 36.Bxf5 gxf5 37.Rxf5+ Kg8 (37...Bf6 38.Qf3!) 38.Rg1! scores ± 12.24
good enough fo me. |
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| Feb-19-10 | | Eduardo Leon: Excuse me for the profanity and lolspeak, but...
36.♗xf5!
Surprise!
36...gxf5 37.♖xf5+ ♔g8
Huh? Everything is in order and you just gave me a free piece. 38.♖g1!
Surprise buttsecks, er... mate! |
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| Feb-19-10 | | wals: Rybka 3 1-cpu:3071mb hash:
How it may have been played out -
38. Rg1 Nd2+ 39. Kc1 Rb7 40. Qf2
Qxg1+ 41. Qxg1+ Rg7 42. Qf2 Kh8 43. Kxd2 Ba5+ 44. Ke3 Bd8 45. Rf8+ Rg8 46.
Rxg8+ Kxg8 47. Ke4 b4 48. axb4 cxb4 49. Kf5 Bg5 50. Kg6 Bf4 51. Qxf4 exf4 52.
d7 Kh8 53. d8=Q# 1-0 |
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| Feb-19-10 | | DarthStapler: I dismissed this line because of Bf6, guess I didn't look far enough |
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| Feb-19-10 | | hedgeh0g: Not difficult. |
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| Feb-19-10 | | ruzon: The puzzle's pawn formation reminds me of a running back that has just split the defensive line and finds no middle linebacker waiting to tackle him in the hole. |
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| Feb-19-10 | | cyclon: 36.Bxf5 and few lines: A) -Bf6 [King can't move] 37.Bxg6 and now f.e. -Kg8 38.Qg4/-Rd8 38.Qh4/-Ne3 38.Qxe3 Qxg6 39.d7, threats d8Q+, Qxc5+ and Rd6. B) -gxf5 37.Rxf5+ Bf6 [-Kg8 38.Rg1 Rb7/Bf6 [[-Qxg3 39.Rxg3+ should win]] 39.Qh2] 38.Qf3 Kf7 39.Qd5+ and now -Kf8 40.Rdf1/-Ke8 40.Qe6  Kg6 40.Qe6. C) -Ne3 [-Nxd6 37.Rxd6 gxf5 38.Rxf5+ Kg8 39.Rg6] 37.Qxe3 gxf5 38.Rxf5+ Bf6 39.Qxe5 Kf7 40.Qe7+ Kg6 41.Rxf6+ Qxf6 42.Rg1+. |
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| Feb-19-10 | | muralman: I solved the puzzle quickly with just one deviation. That is instead of the last move being Rg1, went with QxQ. That is just as fast, as the mate threat remains the same when Rh1. I am 4 for 4. this week. I have no doubt tomorrow's puzzle will punish us. |
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| Feb-19-10 | | Eduardo Leon: <muralman>, 38.♕xg7+?? is a mistake: 38...♔xg7 39.♖g1+ ♔h6 40.♖f2 ♔h5 41.♖h2+ ♗h4. |
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| Feb-19-10 | | Eduardo Leon: In the previous line, I overlooked 40.♖f8, which might still win for white, but 38.♖g1 is still better than 38.♕xg7+. |
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| Feb-19-10 | | johnlspouge: Friday (Difficult)
R Robson vs I Stavrianakis, 2009 (36.?) White to play and win.
Material: R for N+2P, with Bs of opposite color in a midgame. The Black Kf8 has 3 legal moves, all light squares. White has the light-squared B. The advanced White Pd6 takes the dark flight square e7 from Kf8. The White Rf8 pins Pf5 to Kf8, and Rf1 can reload Rf1. The White Qg3 x-rays Qg7 though Pg6, and Kf8 protects Qg7, suggesting a possible decoy. The Qg3 also x-rays the loose Rb8 through the White Pd6 and Black Pe5, but clearance of Pe5 seems unlikely. The obvious sacrifice Rxf5 seems powerful, because the Black Kf8 cannot abandon Qg7. The White Kb1 is secured from check, except for the pointless …Nd7+. Candidates (36.): Rxf5+, Bxf5
[36.Rxf5+ gxf5 and White has nothing]
36.Bf5 (leaving Rf5 after acceptance, which is desirable) 36…gxf5 [else, Black loses a P without compensation for an open Kf8] 37.Rxf5+
(1) 37…Kg8 [Qf7 38.Rxf7+ Kxf7 leaves White with Q for B+N] [37…Qf6 38.Rxf6+ Bxf6 also leaves White with Q for B+N] [else, 38.Qxg7] 38.Rg1 (threatening 39.Qxg7#; …Nd2+ being irrelevant) 38…Qxg3 [Rb7 39.Qf2, after trading R for Q, leaves White with Q for B+N] [38…Bf6 39.Rxf6 Qxg3 40.Rxg3+ Kh7 41.Rf2 and Rh2 - Lawnmower #] 39.Rxg3+ Kh7 [or Kh8] 40.Rh5#
(Black can avoid immediate mate in some variations by sacrificing Nc4, but is then hopelessly down in material.) (2) 37...Bf6 38.Qf2 (threatening 39.Rxf6+)
38…Kf7 39.Rdf1 (threatening 39.Rxf6+)
White will have R for N after capturing Bf6. |
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| Feb-19-10 | | muralman: Eduardo. Gee I got a response, and a good one. Yes, the black rook would gum things up. Thank you. |
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| Feb-19-10 | | muralman: Eduardo, I looked at it again. After QxQ KXQ, Rg1+ Kh7, f5Rh5+ checkmate. |
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Kibitzing
sac: 36.Bxf5