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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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| Feb-19-10 | | Minty: <Eduardo Leon: <muralman>, 38.Qxg7+?? is a mistake: 38...Kxg7 39.Rg1+ Kh6 40.Rf2 Kh5 41.Rh2+ Bh4.> 41. Rf8 still wins, though not very quickly. |
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| Feb-19-10 | | BOSTER: <dzechiel> <36.Bxf5 gxf5, 37.Rxf5 Bf6, 38.Rxf6 >
I don't think that this sacr. is correct. After 38...Qxf6 39.Rg1 black should play 39...Kf7-moving the King to the center and to activate the rook on b8, and if now 40.Qh3 black can play 40...Rh8. 41.Qd7+ Kf8. |
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| Feb-19-10 | | SamAtoms1980: My analysis of the position ran 36 Bxf5 gxf5 (if Black turns this sacrifice down, he still ends up in a big mess) 37 Rxf5+ Kg8 and then I went with 38 Qxg7+, which still wins: 38 ... Kxg7 39 Rg1+ Kh6 40 Rf8 Kh7 41 Rf2, and against Black best defense White will end up ahead a rook. If 36 Bxf5 gxf5 37 Rxf5+ Bf6 38 Qf3 scores the bishop (38 ... Kf7 39 Rf1). |
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| Feb-19-10 | | WhiteRook48: I was right - 36 Bxf5 gxf5 37 Rxf5+ but after 37...Kg8 I got off track
wanted some Qh3?! w Rh1?! |
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| Feb-19-10 | | Minty: <Minty: <Eduardo Leon: <muralman>, 38.Qxg7+?? is a mistake: 38...Kxg7 39.Rg1+ Kh6 40.Rf2 Kh5 41.Rh2+ Bh4.> 41. Rf8 still wins, though not very quickly.> On the other hand, 40... Bg5 seems to be the correct defence. |
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| Feb-19-10 | | turbo231: This puzzle doesn't work on my Rybka. Rybka doesn't make the silly simple moves that Stavriankis made. Rybka moves the bishop down to block. When i tried to solve this puzzle i worried about the bishop. Rybka doesn't make silly and simple moves as was made in this puzzle. |
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Sep-04-10
 | | LIFE Master AJ: After 36.BxP/f5. gxf5; 37.RxP/f5+, Black played 37...Kg8. Several questioned this and said it was a poor move, however, Fritz 12 indicates that ...Kg8 was forced. Even worse was: </= 37...Bf6?!; 38.Qf3! Kf7; 39.Qd5+ Kf8!?; 40.Qe6, "  " and White wins without any problems. |
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| Aug-21-19 | | Cheapo by the Dozen: Material starts out pretty balanced, so declining the line-opening sac after 36 Bxf5 isn't a good option. However, White should only play 36 Bxf5+ gxf5
37 Rxf5+ Kg8
if he's willing to exchange queens, for otherwise his attack will stall. The real solution to the puzzle is to recognize that 38 Rg1 works better than an immediate exchange of queens does, because whatever Black does to avoid mate will lead to loss of a piece or more, usually in the form of a pinned and doubly-attacked bishop that can't be doubly defended. |
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| Aug-21-19 | | goldfarbdj: <Cheapo by the Dozen>: Are there really lines involving bishop pins? After 38 ... Bf6 White can just take the bishop right off. Seems to me the best available is 38 ... Rb7 39 Qf2 Qxg1+ 40 Qxg1+ Rg7. Aside: check out that decade-old comment by chrisowen above! He was actually lucid once. |
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| Aug-21-19 | | agb2002: White has a rook for a knight and two pawns.
The airy position of the black king suggests 36.Bxf5: A) 36... gxf5 37.Rxf5+
A.1) 37... Bf6 38.Qf2 Kf7 (38... Nd2+ 39.Rxd2 Kf7 40.Qxc5 + - [R+P vs b]) 39.Rf1 ends up with a decisive material advantage. A.2) 37... Kg8 38.Rg1
A.2.a) 38... Rb7 39.Qf2 wins decisive material.
A.2.b) 38... Qxg3 39.Rxg3+ Bg5 (39... Kh7(8) 40.Rh5#) 40.Rgxg5+ Kh7 (40... Kh8 41.Rg1 Rb7 42.Rh5+ Rh7 43.d7 wins) 41.Rg1 Kh6 42.Rf2 wins. B) 36...g5 37.Be4+
B.1) 37... Ke8 38.Bc6+ wins the queen.
B.2) 37... Kg8 38.Bd5+ Kh7 39.Rh1+ (or 39.Bf7) 39... Qh6 (39... Kg6 40.Qd3+ e4 (40... Kf6 41.Rd(h)f1#) 41.Qxe4+ Kf6 42.Rd(h)1#. B.3) 37... Bf6 38.Qf2 Kf7 39.Bd5+ wins decisive material. C) 36... Kg8 37.Be6+ is crushing. |
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| Aug-21-19 | | saturn2: After the game line 36. Bxf5 gxf5 37. Rxf5+ Kg8 I went for
38. Qh2 Ne3 39. Rf3 Bg5 40. Rg1 |
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| Aug-21-19 | | stacase: 36.Bxf5 clears the way for a tremendous amount of ugliness and badness for for Black. If Black refuses the Bishop sacrifice the second Pawn is removed with a discovered check and the end is in sight. |
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| Aug-21-19 | | Lambda: Even after 38.Qxg7+ Kxg7 39.Rg1+ Kh6 40.Rf2 white is going to win the bishop with a pin on h4 or g5, though since black can take the d6 pawn while he's doing that, he's going to end up with two rooks and three pawns against rook, knight and four pawns. Not sure if that's enough to win. |
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| Aug-21-19 | | malt: Have 36.B:f5 Bf6
(36...gf5 37.R:f5+ Kg8 38.Rg1 Q:g3 39.R:g3+ )
37.B:g6 Ne3 38.Q:e5 N:f1 39.R:f1 Q:g6 40.R:f6+ |
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| Aug-21-19 | | patzer2: Black's decisive mistake was 19...Nc5? which allowed 20. Nxc5 dxc5 21. f6! +- (+3.86 @ 35 ply, Stockfish 10) with a crushing positional advantage. Instead, 19...Bh4! ∓ to -+ (-1.10 @ 34 ply, Stockfish 10), with ...Nc5 to quickly follow, is near winning for Black. |
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| Aug-21-19 | | TheaN: Oh whoops. I missed that after 36.Bxf5 gxf5 37.Rxf5+ Bf6 (after Kg8 I was almost planning to play the sub optimal Qxg7+?!, but it's winning) 38.Qxg7+? Kxg7 39.Rg1+ Kf7 40.Rgf1? Nd2+ -+ picks up Rf1 and wins the game. 38.Qf3 is straightforward but a bit hidden. |
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| Aug-21-19 | | wtpy: Robson's 32 Rhf1 was not near as strong as 32 Be6 Nd6 33 Rh7 Rb7 34 Bd5. |
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| Aug-21-19 | | NBZ: The key move to see here, and the one that truly makes this a deadly combination, is 38. Rg1! |
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| Aug-21-19 | | drollere: 35. .. g5 is better, a little. |
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| Aug-22-19 | | areknames: At first glance, 11...b4 looks pretty good to me. |
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Kibitzing
sac: 36.Bxf5
