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Dec-21-07
 | | Jimfromprovidence: <UdayanOwen> <As usual, your defensive ideas are proving more resilient to my eye than my positional intuition gave them credit for.
I agree that the proper evaluation is "strong attack for white" but no clear forced win.
It took me a while to come up with a line that seems to really leave black struggling.
22...Kxg7 23.g6 Kh8 is the line we are analysing. 24.gxf7 is my response. Black has to ply 24...Q or Nxf7 (24...Re7 25.f8=Q#, or 24...Rf8 25.Ne6 ).> I agree that it looks like white should win, with his well-conceived plan of attack, but after 22… Kxg7, the execution of the plan proves extremely thorny.
I believe black would play 24… f5 after 24 gxf7.
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| Dec-21-07 | | UdayanOwen: <Jimfromprovidence: I believe black would play 24… f5 after 24 gxf7.> But Jim, isn't the black f pawn gone after 24.gxf7 ?(not a bad move question mark) |
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Dec-21-07
| | Jimfromprovidence: <UdayanOwen> <But Jim, isn't the black f pawn gone after 24.gxf7 ?(not a bad move question mark)> Sorry. I misread it as gxh7.
<UdayanOwen> <Let's look then at the more resilient move in this line, 24...Nxf7.
The best move I have found so far is 25.Qg4, putting immediate pressure on a black weakness.
26...Ne5 (if it doesn't come back now it will after white threatens mate on g7) 27.Qh3 retaining the pressure.> I think you meant 25...Ne5 (if it doesn't come back now it will after white threatens mate on g7) 26.Qh3 retaining the pressure. Anyway, this exchange demonstrates just how complex the position is. Black plays 26…Bf6
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| Dec-21-07 | | Shams: <?(not a bad move question mark)> put the question mark in brackets. :) |
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| Dec-22-07 | | UdayanOwen: Jim.... Yeah I meant 25...Ne5.
I guess you're right that black can play 26...Bf6, because if 27. Nxe6 Qd7, and white will have to go in for an exchange of queens, with just an extra pawn (and considering the doubled isolated b-pawns, this ending is not exactly a fantastic outcome from the strong attack). I did underestimate black's defensive resources when judging 22...Kxg7 23.Kg6 as cruncing for white. I would, however, like to see what a good chess computer says about the position after 23.g6, because I might not be finding the best moves... I still think that the reason black played the way he did was that he was more afraid of letting white open the lines... A GM might be able to find a much more effective way to press the attack than what I have found. At GM level, the idea of positionally sacrificing material to close lines, in an opposite sides castling situation, is not uncommon. The most famous example I know of is Bagirov-Gufeld, 1973. Gufeld sacrafices a knight to keep the lines closed, and wins 16 moves later. Gufeld refers to this as his "immortal game", and Gary Kasparov refers to it as a "mona lisa of chess". It is stunning, and it is on the chessgames database. |
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| Feb-25-08 | | notyetagm: What a way to win a game, 29 ♕g2-g6+!!.
click for larger view |
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| Feb-29-08 | | D.Observer: 32. ... Bf2 33. Rxf2#. |
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| Jun-16-12 | | zakkzheng: Blacks king has no black pawns in front of the king, which makes it a little easier to destroy |
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| Apr-16-20 | | Cheapo by the Dozen: 29 Nxe5 is hugely winning, because Black has to respond to the mate threat at g6. The game line, of course, is better yet. |
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| Apr-16-20 | | Walter Glattke: Nothing brings , if Pe4 was on Pf3 instead, 29.Qg6+ hxg6 30.hxg6+ Kxg7 31.Bh6+ Kf6 32.Bg5+ Kxg6 33.Bxe7+ Kxf7 .. is only a change, so I tested 29.Nxe5 dxe5? 30.Qg6#, but 29.-Rxg7 30.Qxg7+ Qxg7 31.Rxg7 Kxg7 32.Nd7 brings a piece then, while 32.h6+ Kh7 33.Rg1, that wins. 29.Nxe5 Qf6 30.Ng5. But I had a pawn on f3, with Pe4 instead, so 29.Qg6+ Nxg6 30.hxg6+ Kxg7 31.Bh6+ Kf6 32.Ndf1+ is not check, but mate then. |
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Apr-16-20
 | | al wazir: The ♕ sac certainly suggests itself, but why go for brilliance when plain old slogging away also wins: 29. Nxe5 Rxg7 (29...Qf6 30. Nd7, winning the ♗ on b6) 30. Qxg7+ Qxg7 31. Rxg7+ Kxg7 32. Rg1+ Kh8 (32...Kh7 33. Bxb6 Bxe4+ 34. Nxe4 Rxb6 35. f6+ Kh6 36. Nf7#; 32...Kf6/Kf8 Nd7+ wins a second piece) 33. Nf7+ Kh7 34. h6 Bxe4+ 35. Kc1, and now Rg7# can't be stopped. |
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| Apr-16-20 | | goldfarbdj: As often happens with a Thursday puzzle, the first move was instantly obvious, and it was just a matter of calculating the followup to confirm that it worked. It's kind of remarkable how the knight covers all the dark squares, though. |
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Apr-16-20
 | | agb2002: White has a bishop, a knight and two pawns.
Black threatens Qf7 and Bxe3.
White can deliver mate with 29.Qg6+ Nxg6 30.hxg6+ Kxg7 31.Bh6+ Kf6 32.Rdf1+ and mate in two. |
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| Apr-16-20 | | Brenin: For me, the "instantly obvious" move was 29 Nxe5, winning a piece, forcing liquidation on g7, and leading to a clearly won endgame (the h pawn will be decisive). However, that seemed far too prosaic for a Thursday puzzle, and as has been quoted many times, "If you see a good move, look for a better one"; hence the elegant mate with 29 Qg6+, though OTB I would probably have taken the piece and missed it. |
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Apr-16-20
 | | OhioChessFan: 29. Ng5+ seems simple enough. |
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| Apr-16-20 | | goodevans: <OhioChessFan: 29. Ng5+ seems simple enough.> I think you mean 27.Ng5+. If so then that might have been a better place to start the puzzle. Best of all, I feel, would have been to have started it on move 26. Now that would have been a nice puzzle. An opportunity sadly missed. |
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| Apr-16-20 | | trnbg: Nice pun! |
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| Apr-16-20 | | Damenlaeuferbauer: After long pondering, my old Tajik friend Farrukh finally found the mate in 5 moves with the queen sacrifice 29.Qg6+!,Nxg6 30.hxg6+,Kxg7 31.Bh6+,Kf6 32.Rdf1+,Bf2 33.Rxf2#. This is one of the nicest mating combinations I have ever seen. |
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| Apr-16-20 | | malt: Went for 29.Qg6+ N:g6 30.hg6+ K:g7 31.Bh6+ Kf6 32.Rdf1+ Bf2 33.R:f2# |
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| Apr-16-20 | | saturn2: My choice was 29 Nxe5 winning a piece. There is another nice mate in this line. 29. Nxe5 Qf6 30. Qg6+ Qxg6 31. hxg6+ Kxg7 32. Bh-
6+ Kh8 33. Nf7 mate |
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| Apr-16-20 | | saturn2: Seems black ignored to long the kingside attack and started a feeble attack himself. I would have tried 12...e5 13. Nf5 Nc5.
In the Sicilian one wrong move in the opening can cost the game. |
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Apr-16-20
 | | Willem Wallekers: I found Qg6+, a good move, and didn't look for a better one. |
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| Apr-16-20 | | landshark: I haven't had much success recently with CG's daily puzzles but am 4-0 this week!
Today's winning move Qg6+ sort of screamed to be tried - and sure enough its sound. What fun to play such a move! Kudos to those with the skill to set the table for such artistry - |
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Apr-16-20
 | | chrisowen: Acey bid no? |
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| Apr-16-20 | | TheaN: <29.Qg6+ Nxg6 30.hxg6+ Kxg7 31.Bh6+ Kf6 32.Rdf1+ Bf2 33.Rxf2#> is surprisingly forced for a Thursday. Even more so, the key move near instantly jumped in my eye the moment the page opened. It's these 'cage' type mates where a head on queen sac works well: we don't have to use our most powerful piece to mate, as long as it does in the end. After playing 29.Qg6+ only then does one note how forced every followup move is: it's just one escape square every time until after 32.Rdf1+ there is none. Well, 4/4 so far, I'll work on my weekend puzzles for once. See you all tomorrow :> |
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sac: 29.Qg6+