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| Sep-11-09 | | zooter: Hmmm...I think I would have played dxc6 but didn't see the full line after Ba4... |
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| Sep-11-09 | | Whitehat1963: I actually saw the first two moves pretty clearly, but as for beyond that .... |
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| Sep-11-09 | | whiteshark: White is always one threat ahead. |
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| Sep-11-09 | | MiCrooks: I think some were missing the reason why Qb3+ Kh8 was so bad. I don't think it is Ng5, though not a bad move. Simply cxb7 was threatened winning back the piece up several pawns. As it turns out, the "weak" Nxc6 probably gives up the least material though you have a losing game at that point. The other lines at least mix it up a bit perhaps giving Black chances if White messes up. |
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| Sep-11-09 | | remolino: Recovering the bishop leads to no glory and to material equality. I would play 11. dxc6 as it is "faster" than 11. Qb3. Multiple responses for Black, but white will at least win a pawn |
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| Sep-11-09 | | Athamas: I believe Bxb2 is probably the strongest move, thought Nxc6 gives up the same amount of material... at least according to what I saw. |
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| Sep-11-09 | | MiCrooks: I went and dumped the position into the computer and my thoughts were correct. Actually any move other than cxb7 after Kg8 is a big mistake, throwing away an easy win to play in a double edged position. What people who discussed this line must have forgotten is that White is already a piece down, so that Nf7+ is not that big of a threat. So if Ng5 Black simply plays Nc6 developing and winning back a pawn then when the Knight goes to f7 he takes with the Rook. You end up in a double edged position where Black has two Knights for a Rook and a pawn (the d3 pawn will drop quickly). It looks to me like Black has the advantage, but even if you say there are chances for both sides it is still much worse for White than cxb7 was. The game move of Ba5 was one of the worst of the reasonable responses, and since the continuation was pretty much forcing one that Black should have seen coming and avoided. |
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| Sep-11-09 | | Deji: This one was pretty tough. Nice observation by ONCE as touching the c pawn and the french defence |
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| Sep-11-09 | | agb2002: White has a pawn for a knight. White can pose some threats against the black king and b7 simultaneously with dxc6 and Qb3. The move order seems to be important: after 11.Qb3 cxd5 12.bxc3 White has the better position and an extra pawn but there is a lot to play. Therefore, 11.dxc6: A) 11... Ba5 12.Qb3+ (12.cxb7 Bxb7 13.Qb3+ Bd5 - +)
A.1) 12... Qd5 13.Qxd5+ Nxd5 14.Ne5 (threatens 15.Bxd5+) A.1.a) 14... Rd8 15.c7 Rd6 16.cxb8=Q Rxb8 17.Nc5 Bc7 18.Nxd6 + - [R]. A.1.b) 14... bxc6 15.Nxc6 (threatens 16.Nxa5 and 16.Bxd5+) Nxc6 16.Bxd5+ Kh8 17.Bxc6 + - [2P]. A.1.c) 14... Be6 15.cxb7 Na6 16.bxa8=Q Rxa8 + - [R+P vs N]. A.2) 12... Kh8 13.cxb7 Bxb7 14.Qxb7 Nbd7 (14... Qd5 15.Ng5 Qxb7 16.Bxb7 Nbd7 17.Bxa8 + - [R+2P vs N]) 15.Qb5 + - [2P]. B) 11... Nxc6 12.bxc3 and White is a pawn ahead and has a much easier game since he only needs to complete his development and push his central pawns. C) 11... Bxb2 12.cxb7 Bxb7 13.Bxb2 (13.Rb1 Bxc1 14.Rxb7 Bh6 (14... Ba3 15.Qb3+ + - [B+P]) 15.Qb3+ Kh8 16.Ne5 is not clear because, although the threat Nf7+ will win the exchange at least, White is still a piece down) and White will push his passed, extra pawn. D) 11... bxc6 12.bxc3 is more or less similar to B.
E) 11... Be6 12.cxb7 + - [R+P vs N].
Not quite convinced but can't spend much time on this puzzle. |
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| Sep-11-09 | | patzer2: For today's Friday puzzle, Ivanov's clever 11. dxc6!! passes up an "obvious recapture" in order to play a deep combination, emphasizing the double attack but also using multiple supporting tactics, in order to win back the temporarily sacrificed material with interest. In the game continuation, I expect the surprise move for Black is 14. Ne5!, which utilizes the discovered attack, pinning, and double attack tactics as threats to win back the temporarily sacrificed material with interest -- in this case an unstoppable outside passed pawn. If 14...Rd8, then the deflection 15. Bg5! sets up a winning knight fork after 15...Rd6 16. Nc4  . |
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| Sep-11-09 | | BOSTER: I'd call this puzzle Petrosian's lessons continuation.
Moving F7-f5 black has opened the gate into his castle-diagonal a2-g8 is opened for invasion,and squre f7(and e6) now has invited Nf3 to come in.
So, 11.dxc6 Nxc6
12.Qb3 Kh8
13.Qxc3 White pawn ahead.
Or line 11.dxc6 Ba5
12.Qb3 Kh8
13.cxb7 Bxb7
14.Qxb7 Nbd7
15.Ng5 Rb8
16..Qa6 and white two pawns ahead. |
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| Sep-11-09 | | patzer2: <TheBish> Good analysis! I enjoy your informative posts. |
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| Sep-11-09 | | A Karpov Fan: I got most of it, dunno, tough to stay motivated atm :-( |
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| Sep-11-09 | | CHESSTTCAMPS: Black temporarily has a piece for a pawn, but the material will be level after the routine 11.bxc3 Nxd5 (or cxd5). Black is a tempo behind in development, has vulnerabilities along the b3 and g2 diagonals, and has given up the bishop pair. At this cost, black has the better pawn structure. White can steal a pawn by playing a finesse: 11.dxc6!!
A desperado pawn! If black tries to rescue the bishop with A) 11... Ba5, white plays 12.Qb3+ Qd5 13.Qxd5+ Nxd5 14.Nd4! (Ng5? bxc6 is fine for black) Rd8 15.Bg5! Rd6 16.Be7! Rg6 17.Bxd5+ Kh8 18.fxg7 and black can resign. A.1) 12... Kh8 14.cxb7 Bxb7 15.Qxb7 Nbd7 16.Ng5 (or Bf4) leaves white two pawns up with an ongoing initiative. A.2) 14... bxc6 15.Nxc6! Nxc6 16.Bxd5+ Rf7! 17.Bxc6 Bb7 18.Bxb7 Rxb7 19.Rd1! (19.b3 Rd8 followed by R7d7 gets a pawn back) Rd8 20.Kf1 R7d7 21.Ke2 and white holds a two pawn advantage. A.3) 15... bxc6 16.Bxd8 Bxd8 17.Nxc6! again shatters the black position. Alternatives also leave black down in material and position: B) 11... Bxb2 (dualing desperados) 12.cxb7 Bxb7 13.Bxb2 keeps a solid pawn advantage and 2B advantage. B.1) (white alternative) 12.Ng5 might be better e.g. Bxa1 13.cxb7 Bxb7 14.Bxb7 N8e7 15.Qb3+ Kh8 16.Bxa8 Qxa8 17.Ba3! (not as good is 17.Nf7+ Rxf7 (Kg8?? 18.Nh6+ is the familiar Philidor's Legacy mate) 18.Qxf7) Bd4 18.Bxf8 Qxf8 19.Nf7+ Kg8 20.Ne5+ Kh8 21.Nxd7 Nxd7 22.Qd5 with a winning fork. C) 11... Nxc6 12.bxc3 and white has an extra pawn, the 2Bs, and black still has to deal with the threats of Ng5 & Qb3+. Time to check the game... |
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| Sep-11-09 | | DarthStapler: I got it but didn't analyze much since it just wins a pawn so I thought there was something better. |
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| Sep-11-09 | | CHESSTTCAMPS: A couple of interesting positions from my first post. After the game move 16.Bxd5+ (equivalent to A.2 in my analysis) the following position arises:
click for larger viewFWIW, I thought that black could save tempi (at the cost of exchanging bishops) with 16... Rf7 (instead of Kh8) 17.Bxc6 Bb7 18.Bxb7 Rxb7. White also can avoid the bishop exchange with 18.Ba4. With a 2-pawn advantage for white, it probably does not make much difference, but some comparative engine analysis might be worthwhile. Another position of interest is reached after 11... Bxb2 12.Ng5!?? (line B.1 in my first post): 
click for larger viewInstead of 12...Bxa1, black improves with 12... Bxc1! 13.Qb3+ Kh8 14.cxb7 Bxb7 15.Qxb7 Bxg5 16.Qxa8 Qd4 (Analysis by ChessMaster) and black is far better off than in the simple line 12.cxb7 Bxc7 13.Bxb2 (my line B) that was mentioned by other kibitzers. Desperado tactics can be difficult to track correctly! |
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| Sep-11-09 | | johnlspouge: Friday (Difficult):
V L Ivanov vs N Pushkov, 1991 (11.?) White to play and win.
Material: Down P for N. The Black Kg8 has 2 legal moves. White can (re)capture 11.Pb2xBc3 or capture 11.Pd5xc6. The White Kg1 is secured from check. Candidates (11.): dxc6
11.dxc6
(threatening 12.bxc3 or 12.Qb3+ then 13.bxc3 or 13.Qxc3, winning a P) In addition, 12.Qb3+ can inaugurate a light-square assault on both sides of the board, with 13.Ng5 or 13.cxb7 next. Because White can also play 12.cxb7 13.bxc3 winning a P even if Black recaptures, Black must move Bc3 or drop at least a P. I had a tough day at work, so I am going to forgo a detailed analysis. |
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| Sep-11-09 | | donehung: LOL "desperado pawn" |
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| Sep-11-09 | | donehung: I didn't quite look 25 moves ahead but the pawn capture looked like the best counter play for white. |
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| Sep-11-09 | | tacticalmonster: 1) white is down a piece but he can easily regain it. White is also up a pawn but black can regain it if he is not careful 2)The a2-g8 diagonal is partially blocked by the d5 pawn which lead to the black king 3) The g2 bishop is aimming at the h1-a8 diagonal. The diagonal can be blasted open after dxc6 candidate: Qb3 and dxc6
a.Qb3
1. cxd5 2 bxc3 black position is full of hole
1. Nxd5/Qxd5 2 bxc3 kh8 3 c4 
b. dxc6
1. Bxb2 2.Qb3+ Qd5 3.cxb7 Bxb7 4.Qxb2 Bc6 5.Bf4 white is up a pawn plus pressure down the a8-h1 diagonal 1. Ba5 2. dxc6+ Qd5 3. Ne5 Qxb3 4. axb3 5.Nxc6 Nxc6 6. Bxc6 Rb8 7. Rxa5 Rxb3 8.Rxa7 Rxd3 white is up a pawn I choose dxc6 |
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Sep-11-09
 | | Jimfromprovidence: Thanks to <TheBish>,<agb2002> and <CHESSTTCAMPS> for pointing out the alternative 11...Bxb2, which I completely missed. 
click for larger view It looks like this line wins just a pawn for white, where the text after 17 Bxc6 wins two. Maybe this was the difference between losing and drawing for black. |
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| Sep-11-09 | | WhiteRook48: I was looking at 11 Qb3 |
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Sep-11-09
 | | LIFE Master AJ: <<Sep-11-09 <Once>: Cute.> This is the bigger brother of yesterday's puzzle. We have the same motif - queen check on b3 plus an attack on b7, but with the added complication of more black defences to consider including Qd5.> I was going to ask if anyone had a case of "deja-vu" looking at this problem ... |
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Sep-11-09
| | LIFE Master AJ: I had this eerie feeling that dxc6 and Qb3 was the answer, as soon as I looked at the problem. (Just like yesterday's problem.) Of course, this was only because I spent so much time analyzing the tactical tricks of yesterday's problem. Here is how I saw this sequence, (after about 10 minutes of checking the various lines): 11.dxc6!!, B-moves; (Prolly a5) 12.Qb3+, Qd5; (the only challenging move, otherwise White wins material with the same pawn fork on b7 as yesterday ... ALSO supported by the Queen). 13.QxQ/d5, NxQ/d5. Now the only hard move - for me at least - was 14.Ne5! (discovered attack) Now the Knight on d5 cannot move, neither can the c8-Bishop. This means that 14...bxc6 might be forced. If it is, White has the winning plan of NxP/c6! and BxN/d5+, coming out several pawns ahead. |
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| Sep-12-09 | | A Karpov Fan: anybody know how much Kasparov is charging for tuition? I'm sure he will give me a discount if I email him, cos it has to be more satisfying to help someone add 1000 points to their rating in a year than just 50 :-) |
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Kibitzing
sac: 10.exd5