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|Feb-26-05|| ||kevin86: The combination reminds me of the deeds of a pickpocket;it seems that nothing was happening and suddenly-white had two pieces under fire and lost one of them! |
|Feb-26-05|| ||yoozum: <<yoozum> This is a Saturday puzzle> |
Lol, good point. It seems I have some other issues besides not being able to solve this puzzle.
|Feb-26-05|| ||twitter: i, for one, think this is an amazing combination. i find the resulting mate after 21. Bxc4 (or anywhere else) to be extremely pleasing.
i personally didn't get this one. i went for ..Qxc3 but got hung up after the king went behind the bishop. very, very pretty! |
|Feb-26-05|| ||Hektor: I am impressed by how well black created weaknesses in white's pawn structure then exploited them with the double bishop. I so focused on looking at possibilities around 20. ...Qxc3 that I failed to give 20. ...c4! appropriate attention. That's probably why Balashov's name is in here and not mine! Very nice puzzle. |
|Feb-26-05|| ||Gypsy: A good, practical pattern: A nifty way to stop such an Q-exchange (or other piece exchange) sometimes. Of course, here White has to give up his piece because if 21.Be2 Qxc3+ 22.Kxc3 then exf4+ 23.Kxc4 Be6+ 24.Kc5 Be7+ 25.Kc6 Rdc8#. |
|Feb-26-05|| ||maxundmoritz: It's a very interesting game. Move 30.a3 was a mistake and 30...Bd5 with the double attack on b3 seems to be the best answer, because 31.exd5 Rxb3+ and White has no good defenses. Other options don't look any better for White. |
|Feb-26-05|| ||Happypuppet: 20... c4!... In my opinion, the move isn't truly difficult to see. I suppose it's a Saturday puzzle to be deceptive: I was calculating all sorts of sacrifices (a wild one can be expected on a weekend) and simply couldn't find one that worked. =P |
|Feb-26-05|| ||minimaxing: <Happypuppet> The reason c4 is so effective is because of the threat of the queen sac. The bishop is pinned by the threat of mate. If 21. Bxc4, then black has a forced mate after 21... QxN. Likewise, if 21. Be2, mate is once again forced by 21... QxN. While these variations weren't played in the game, you needed to calculate them to play c4, so I think this is an appropriate Saturday puzzle. |
|Feb-26-05|| ||Gypsy: <minimaxing> I agree with you. I think it is a fairly tough move to find (though not so hard to compute). The c4 being it a pawn move, it is naturally harder to see. It does not transparently open a line for a piece like, say, exf4 does. And there also is such a sense of urgency in the position, because of the pending Q-exchange, that, at a superficial glance, c4 just looks wimpy. |
|Feb-26-05|| ||CFC rating: I've been doing these puzles everyday for a week and this is the only one I didn't get... |
|Feb-27-05|| ||JL2: nowhere near
to be honest i looked at pawn c5-c4 for 5 seconds before moving on
|Oct-29-17|| ||RKnight: Well, I thought I'd partially solved it, noting that the B, N and b pawn are all pinned: 18...exf4, 19 gxf4 20 Be2 (it's immune, as 20 Qxe2 Qxc3+, 21 Kc1 Be7, etc.) and there must be a winning combo there somewhere. But, that's not what was played.|
|Oct-29-17|| ||sudoplatov: I got it through move 23 then I quit analyzing. However, my system displayed the puzzle from 18.Kb2 so I also found 18...c5 19.h3 Bc8 then 20.h3 is answered by 20...c5.|
|Oct-29-17|| ||mel gibson: I thought that
looked good, but it's not.
However the computer, DR4 64 bit, agrees with the text:
18. Kb2 c5 (18. .. c5 (c6-c5
h2-h3 ♗g4-d7 ♕d2-f2 c5-c4 ♕f2xd4 e5xd4 ♘c3-d5 c4xd3 c2xd3 ♗d7-b5 ♖f1-f3
♖d8-d6 ♘d5xf6+ ♖d6xf6 ♖h1-c1 ♖f6-c6 ♖c1xc6 ♗b5xc6 ♖f3-f2 ♔g8-f8 ♔b2-c1
♗c6-b5 ♔c1-d2 ♖b8-c8 ♖f2-f3 ♔f8-e7 g3-g4 ♔e7-e6 ♖f3-g3) +1.56/21 129)
score for Black +1.56 depth 21
|Oct-29-17|| ||agb2002: Black has the bishop pair for a bishop, a knight and a pawn.|
White threatens f5 and h3, trapping Black's lsb.
Black can try and exploit a number of pins with 18... exf4 19.gxf4 (19.Rxf4 Bg5 gets an exchange for a pawn) 19... Be2:
A) 20.Qxe2 Qxc3+ 21.Kc1 (21.Kb1 Qb2#; 21.Ka3 Be7+ and mate next) 21... Rxd3 22.Qxd3 Qb2+ 23.Kd1(2) Rd8 - + [q+b vs 2R+P].
B) 20.Rfg1 Bf3 wins an exchange.
C) 20.Re1 Bf3 21.Rhf1 Bxe4
C.1) 22.Rxe4 Qxe4 - + [r vs N].
C.2) 22.Re3 c5 with the threat c4 looks very good for Black.
D) 20.e5 Bxf1 21.exf6 Bxd3 wins an exchange.
|Oct-29-17|| ||groog: Yup, not too difficult for a Sunday, the moves seem to play themselves. However, saying that a very pretty puzzle.|
|Oct-29-17|| ||goodevans: What I completely failed to spot was that if white tries to save the piece with <21.Be2> black can win it anyway with <21...Qxc3+>.|
After <22.Kxc3 exf4+> white must return the Q with <23.Qd4> as <23.Kxc4> leads to a quick death as per <murraygd13>'s post of 2005.
|Oct-29-17|| ||devere: 18...c5 19.f5 c4 20.h3 Bg5 -+
This may be the easiest Sunday problem ever.
|Oct-29-17|| ||morfishine: There is no deflection tactic within today's combination. |
Below is an excellent example of a deflection:
click for larger view
With White to move, do you see the winning deflection tactic?
|Oct-29-17|| ||catlover: <morfishine> Nice. Rb8 Qxb8 deflects black's queen, permitting white to play Qxh4 followed by checkmate.|
|Oct-29-17|| ||patzer2: Black's game takes a slight turn for the worse with 15. Bd3 e5! ⩱ to ∓ (-0.36 @ 35 ply, chessgames.com Stockfish analysis). Instead, 15. Qe1 = (0.00 @ 42 ply, chessgames.com Stockfish analysis) keeps it fully level.|
Black's decisive mistake was the self-pin 18.Kb2? allowing 18...c5! -+ (-2.51 @ 39 ply, chessgames.com Stockfish analysis) which solves today's Sunday puzzle. Instead, 18. Kb1 ∓ (-1.10 @ 36 ply, chessgamees.com Stockfish analysis) would have put up much more resistance.
Here's the detailed analysis of 18...c5! by the chessgames.com Stockfish engine:
-2.51 (39 ply) 18...c5 19.h3 Bc8 20.Qf2 c4 21.Qxd4 exd4 22.Nd5 cxd3 23.cxd3 Ba6 24.Rd1 Rdc8 25.Rhf1 Bd8 26.f5 Kf8 27.h4 Bb7 28.Nf4 Be7 29.Ne2 Ba6 30.Rf3 Bd6 31.Rc1 Ke7 32.g4 Rxc1 33.Kxc1 Be5 34.Kd2 Bf6 35.Kd1 Rc8 36.Kd2 Kd6 37.Rh3 Ke5 38.a4 Be7
I was surprised to see our deep engine analysis was so close to the game continuation, following it exactly for the first seven moves of the combination.
P.S.: If 21. Be2, Black wins with 21...Qxc3+! -+ (-9.76 @ 23 ply, chessgames.com Stockfish engine). In our Sunday puzzle position 18...Qxc3+?? fails to 19. Qxc3 +- (+8.61 @ 22 ply, chessgames.com Stockfish engine) which is one good reason 18...c5! has to be played first. The threat of 21...Qxc3+! requires some preparation and 18...c5! fills the bill.
|Oct-29-17|| ||FSR: 18...c5 (threatening 19...c4) 19.Qf2 (19.Qe1 c4 20.Be2 Bxe2 21.Qxe2 exf4) c4 20.Be2 Qxc3+ 21.Kxc3 exf4+ 22.Kxc4 Be6+ 23.Kc5 Rb6 and 24...Be7#.|
|Oct-29-17|| ||Sneaky: <morfishine> Nice back-up puzzle for the weekend, thanks, much fun. Is that from a real game?|
|Oct-29-17|| ||patzer2: Correction: <White's> game takes a turn for the worse with 15. Bd3?! e5 ⩱ and White is lost after 18. Kb2? c5! -+. |
In between those two moves, instead of 16. g3?! ∓ our Stockfish engine indicates White can put up more resistance with 16. Na4 ⩱:
-0.35 (36 ply) 16.Na4 Qc7 17.g3 c5 18.Qf2 exf4 19.Bc4 Rxd1+ 20.Rxd1 Bg4 21.Rd3 f3 22.c3 Re8 23.Nxc5 Be7 24.b4 Bxc5 25.bxc5 Qa5 26.Bd5 Qa3+ 27.Kd2 Rb8 28.Bb3 Rc8 29.Ke1 Rxc5 30.h3 Be6 31.Bxe6 Qc1+ 32.Rd1 Qxc3+ 33.Qd2 fxe6 34.Qxc3 Rxc3 35.Rd7 Rc2 36.Rxa7 Rg2 37.Ra6 Rxg3 38.Rxe6 Rxh3
|Oct-30-17|| ||morfishine: <Sneaky> In this game, someone termed Black's tactic a 'deflection', which I doubted, so I searched 'deflection-examples' and found this position. I liked it for its simplicity: Black Queen has absolutely no wiggle room, she's tied to the d8-h4 diagonal but cannot move along it since e7, f6 & g5 are all covered. Once she's forced off that diagonal, its all over|
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