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| Jul-24-09 | | Patriot: Initial candidates: Rxc7+,Nc5+,Qxe6
A) 37.Rxc7+
A1) 37...Qxc7 38.Nc5+ Kb6 (38...Kb8 39.Na6+ wins) 39.Qxc7+ Kxc7 40.Nxe6+ Kc8 41.Nxd8 Kxd8 42.Kc2 should win easily. A2) 37...Ka8/Kb8 38.Qxd8+ 
A3) 37...Ka6 38.Qa4+ Qa5 39.Ra7+ Kxa7 40.Qxa5+
Variation A is already winning, so this could be played immediately. But I'll go ahead and sample the other candidates to decide which is best. B) 37.Nc5+ Qxc5 38.dxc5 Rxd7 39.c6+ Kc8 40.cxd7+ Kxd7 looks dangerous for white due to the pawns on e6 and d5. This gives black possible counterplay so scratch this candidate. C) 37.Qxe6 -- A quiet move, which tells me to use extreme caution! It appears variation A is best because of it's more forcing nature. One possibility here is 37...Rd6 threatening both 38...Rxe6 and 38...Qxd4. Not good. Another possibility is 37...Qxe6 38.Nc5+ Kc8 39.Nxe6 Rd7 40.Rxc7+ Rxc7 41.Nxc7 Kxc7 looking almost like variation A but with the black king one step closer to the queenside--another bad sign. So I choose variation A. |
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| Jul-24-09 | | remolino: RoseBuster: Yes of course, Kb6 is better for Black, I was simply focusing on the exchange variation, and overlooked the obvious fork if Black plays Kb8, thanks |
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| Jul-24-09 | | CHESSTTCAMPS: Material is even, but white is clearly winning with the pin on the bishop forcing black into passivity. White has a choice of forcing continuations, each of which should be examined carefully. Tempting is 37.Nc5+?, intending to meet 37... Kb8? with 38.Na6+ and 37... Ka7? with 38.Qa4+ Kb8 39.Na6+ winning. However, black has 37... Qxc5 38.dxc5 Rxd7 39.c6+ Kc8 40.cxd7+ Kxd7 41.Rg1 Bxh2 42.Rxg4 Bd6 and with black's connected passed pawns and his a-pawn protected, white is going to have trouble in this ending. However, the simplication 37.Rxc7+! forces an ending that is a piece of cake: 37... Qxc7 38.Nc5+ Kb6 (Kb8? 39.Na6+) 39.Qxc7+ Kxc7 40.Nxe6+ and black can resign. A reasonable winning procedure is 40... Kd7 41.Nxd8 Kxd8 42.b4 Kc7 43.Kc2 Kb6 44.Kb3 Kb5 45.Kxa3 Kc4 46.b5 (Ka4 Kxd4 46.b5 Kc5 47.Ka5 also wins by a tempo and skewer) Kxb5 47.Kb3 Ka5 48.a4 Ka6 49.Kb4 Kb6 50.a5+ Ka6 51.Kc5 followed by Kxd5 and promotion of white's d-pawn. Alekhine generally dominated Bogoljubov; was this an exception? |
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| Jul-24-09 | | backrank: Difficult? I just wonder. I got this one at once, while I failed to solve some of the 'medium' or even 'easy' puzzles.
Everything's forced here, there are no side lines, and all it needs is to realize that the resulting pawn endgame is winning for white. |
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| Jul-24-09 | | CHESSTTCAMPS: <gofer: I don't see why white had to make this end game so difficult by playing b4?
42 Kc2 <snip>> I agree that 42.Kc2 also wins easily, but it's not critical to preserve white's b-pawn to demonstrate a win. In my first post, I chose the line with 42.b4 (which happens to match the game line almost to the end) because it reduces the analysis needed to prove a win. Experienced players know that the outside, passed a-pawn wins. This is a good example to demonstrate to inexperienced players why this is true. |
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| Jul-24-09 | | tivrfoa: 37. Rxc7+ is better, but I think 37. Qxe6 is not so bad. :/ 37. Qxe6 Qxe6
38. Nc5+ Kb6
39. Nxe6 Rc8
40. Nxc7 Rxc7
41. Rxc7
end ups the same thing. but if black doesn't exchange the queens? 37. Qxe6 Bxh2 (Qxd4?? 38. Nc5+ Kb8 39. Na6+)
38. Qxg4 ... |
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| Jul-24-09 | | kevin86: The key was not winning material,but simplification-the pawns will win the game. |
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| Jul-24-09 | | David2009: <ounos:> David2009:
Alekhine chose Rxc7+! [snip] < Bogo would have been really sad by a remark like this. Nobody believes that it was <he> who won the game, for once, not Alekhine!> OUCH!!. Thanks, <Ounos> This really IS a bad blunder! Not my day. Incidentally 37 Qxe6 may not even win - 37 ...Bxh2 38 Nc5+ Ka7 39 Qe7+ Ka8 40 Nd7 Rxd7 41 Qxd7 Qxd4 42 Rc8+ Bb8
43 Qc6+ Ka2 
click for larger view and Black is alive and kicking. |
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Jul-24-09
 | | doubledrooks: I went with 37. Rxc7+ Qxc7 38. Nc5+ Kb6 (not Kb8?? 39. Na6+) 39. Qxc7+ Kxc7 40. Nxe6+ Kd7 41. Nxd8 Kxd8 42. Kc2 and white has a won endgame. |
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| Jul-24-09 | | YouRang: I saw the whole thing, or at least that first sequence of moves that causes all the pieces to come off. I probably wouldn't have been so confident that white had a winning king and pawn endgame, but with the passed b-pawn, I would figure I (as white) was better off. |
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| Jul-24-09 | | gerpm: Got the first couple of moves |
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| Jul-24-09 | | YouRang: <YouRang><I probably wouldn't have been so confident that white had a winning king and pawn endgame, but with the passed b-pawn, I would figure I (as white) was better off.> Looking at it again (having moved forward to move 42), I think it's quite clearly a winning endgame for white, so the exchanges starting at move 37 were well justified. It helps that the exchanges ended with the black king on the back rank. :-) |
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| Jul-24-09 | | eainca: Talk about nit picking! The game as played is much more elegant than
42.Kc2, Kc8(opposition)
43.Kc3, Kc7
44.Kb4, Kb6
45.Ka3, Ka5
46.Kb2, Kb4 and black, while lost, can drag it out for quite some time (if so inclined). |
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| Jul-24-09 | | waustad: I don't usually see Friday puzzles so fast, if at all. |
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| Jul-24-09 | | fporretto: Would someone please help me cook 37. Nc5+?
It appears to win substantial material in all
variations:
37. Nc5+ Kb8
38. Qxd8+ Bxd8
39. Nd7+
37. Nc5+ Ka7 or Ka8
38. Qa4+ Kb8
39. Na6+ Kb7 or Ka7 or Kc8
40. Rxc7+
37. Nc5+ Ka7 or Ka8
38. Qa4+ Kb8
39. Na6+ Ka8
40. Nxc7++
What have I missed? |
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| Jul-24-09 | | Patriot: <fporretto: Would someone please help me cook 37. Nc5+?
It appears to win substantial material in all
variations: ...What have I missed?
>
You missed 37...Qxc5! I looked at this first since white's queen is also hanging. See my previous post variation "B". |
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| Jul-24-09 | | butilikefur: Hey <David2009>
After <37. Qxe6 Bxh2 38. Nc5+ Ka7 39. Qe7+ Ka8 40. Nd7 Rxd7 41. Qxd7 Qxd4 42. Rc8+ Bb8 43. Qc6+ Ka7> White should still have a won endgame. <44. Qc5+ Qxc5 45. Rxc5 g3> 45...d4 46. Rd5 d3 47. Rxd3 g3 48. Rd7+ Kb6 49. Kc2 Kc5 50. Kd3 <46. Rxd5 Bf4 47. Rd4 Be5 48. Rg4 Kb6 49. Kc2> |
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Jul-24-09
| | OBIT: OK, looking at this, I'll be real surprised if the first move is not 37. Qxe6. Then if 37...Qxe6 38. Nc5+ Kb6 39. Nxe6 Rd7 40. Nxc7 Rxc7 41. Rxc7 Kxc7 is an easily won K+P endgame. So, Black must have something better than 37...Qxe6, except, um, 37...Qxd4 38. Qc6+ wins the bishop with check, and every other Black move just looks clearly better for White. Seems too easy for a "difficult" puzzle. Looking at the answer should be enlightening - can't wait to see what I missed. |
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| Jul-24-09 | | Coigach: This seemed to me the most straightforward combination this week. There is a fairly narrow range of options, unlike Monday, and no tricky sting in the tail, such as on Wednesday. It just requires seeing that winning a pawn while liquidating to a pawn ending leaves a straightforward win. |
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| Jul-24-09 | | dzechiel: <MohdSalah: Sorry I found this puzzle is silly not because it's easy or not but because that player did all that just to win a pawn!> I think you fail to see the big picture here. Bogo played the combination because it was the clearest and easiest way to win the game, it just happened to be that this was accomplished by winning a single pawn. |
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| Jul-24-09 | | YouRang: <OBIT: OK, looking at this, I'll be real surprised if the first move is not 37. Qxe6. Then if 37...Qxe6 38. Nc5+ Kb6 39. Nxe6 Rd7 40. Nxc7 Rxc7 41. Rxc7 Kxc7 is an easily won K+P endgame. > Interesting, but not as forcing. Instead of 37...Qxe6, black might opt to create a passed pawn threat with 37...Bxh2. I'm not sure that the win is so clear for white then. |
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Jul-24-09
| | OBIT: <YouRang>Yeh, I've been looking at this. David2009 suggests 37...Bxh2 after 37. Qe6, and after 38. Nc5+ Ka7 I'd play 39. Qxg4 before trying to penetrate with the rook and queen. Black has a very hard position to defend, IMO. Having said that, the line played in the game reaches the K+P ending by force, so there is nothing else to consider - point taken. |
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| Jul-24-09 | | YouRang: <dzechiel><Bogo played the combination because it was the clearest and easiest way to win the game, it just happened to be that this was accomplished by winning a single pawn.> Right. Lots of games are won by recognizing when and how to simplify to a winning endgame. This is a good example of Bogo doing just that. |
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| Jul-24-09 | | lzromeu: The easiest of the week until now.
What could white will do? |
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| Jul-24-09 | | WhiteRook48: first I thought of 37 Rxc7+ but couldn't see the follow-up
stupid blindness |
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sac: 37.Rxc7+