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| Feb-13-08 | | just a kid: I was looking for a win also!I found that 43.Bc7! was a draw,but I kept searching for a win.Then I agreed just to go for the draw.After a fairly easy week last week Chessgames is coming back with a hard one. |
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| Feb-13-08 | | aazqua: CG needs to specify win or draw. I saw the draw quickly as well but assumed there must be a way to win given how loose black was. |
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| Feb-13-08 | | TrueBlue: the key was to see that black was very close to getting a queen, so draw was good. Yes, a little tricky but got it after 10 minutes. |
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| Feb-13-08 | | johnlspouge: Wednesday (Medium/Easy): White to play and draw
Material: B for N, down 3Ps. Because of the Black Pb2, White probably needs to mate. He has the Rf1 and Qf6 battering ram on the f-file, but his Bd8 is not in a good position to take advantage of the weak dark-square complex around the Black K. The Qc5 must defend against Qf8#. Candidates (43.): Qxe6+, Be7, Bb6, Bc7
43.Bc7
threatening perpetual check with (1) Qd8+, Qf6+, and Qh4+; (2) Qf7+ and Qf6+; and mate with (3) 44.Qd8+ Kg7 45.Bxe5+ Kh6 [Qxe5 46.Qf8#] 46.Qh4# The Kg8 cannot move. The Qc5 cannot stop threats (1) and (3); and the Rb7 cannot stop threat (1). The Ne5 can stop threat (2) only with 43...Nd7 or 43...Ng4, but the simplest way to demonstrate a draw is to note that 44.Qd8+ Kg7 45.Be5+
renews threats (1) and (3) after capture of Be5, because of 45...Kh6 46.Qh4#.
Time to peek. This was brutal. I went through four candidates, always looking for the win that was not there. Finally, I decided it was tough even to find a draw. To convince myself, I had to prove the position could be drawn. Here's the proof of Wednesday's theorem (:>O
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| Feb-13-08 | | zb2cr: Rotgut. Because of Black's threat to immediately Queen, I totally dismissed any move that wasn't a check--and figured 43. Qxe6+ had to be it. |
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| Feb-13-08 | | johnlspouge: <dzechiel: Once the mating attack is shown not to be there (the real work in the position)> I needed a lot of confidence in my own judgment to stop looking for a non-existent win. I personally had to calculate a lot to call the position a draw. <dzechiel: it's not THAT difficult to find the line that forces the draw.> It's not THAT easy either ;>) Although Bd7 obviously needed to improve its position, I went through all the B's candidates before noting the obstruction of the Rb7. Unless a failed candidate was particularly instructive, my failed candidates are usually the only Cheshire smile I leave of all my wrong turns. I believe our respective styles are appropriate, however, so thanks, <dzechiel>, for letting us see your processes on this puzzle. <dzechiel: Thanks for keeping us on our toes, chessgames.> Likewise, thanks, chessgames. |
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| Feb-13-08 | | johnlspouge: <tallinn: But Fritz showed me the hole in my calculation: Bb6 Qd6 Bc5 Ng4! and white is lost.> Thanks, <tallinn>, for using Fritz. The quality of posts benefits enormously from chess programs. Just in case anyone does not know, my chessforum contains instructions for downloading chess freeware. |
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| Feb-13-08 | | YouRang: I see I wasn't the only one looking (in vain) for a win. One mustn't presume... So, the best I can do is pretend that if I HAD considered looking for a way to draw, that I might have found 43...Bc7!!. :-) |
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| Feb-13-08 | | kevin86: I was looking for a win-but I guess there was none to be had. |
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| Feb-13-08 | | mworld: i gotta say, looking for a draw is tough! Anytime I see a puzzle mid week I think it has to have material/mate to be an answer. Darn! |
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| Feb-13-08 | | YouRang: <aazqua: CG needs to specify win or draw. I saw the draw quickly as well but assumed there must be a way to win given how loose black was.> Well, if you saw the draw quickly, you solved it. :-) But I disagree with the suggestion that cg.com must tell us which outcome to aim for. Being able to properly assess a given position is an important chess skill to develop. Today, a bunch of us didn't assess it well or (more likely) didn't bother to assess it at all. |
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| Feb-13-08 | | wals: Noting think-
What principal variation fits the strategic demands of the positiion?
43.Rf1-c1...Q x c1+ 44.Kh2...Ng4+ puts black in command
bang goes the white lady.
43.Bd8-b6 if R x b6 44.Qd8+ looks a winner
43.Bd8-b5 if Q x b6 44.Qf8+ decivise
The outcome depends on what black plays
PM =
Certainly a brilliant move by white and the only one to save him from defeat. |
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| Feb-13-08 | | wals: Garry Kasparov - V Tukmakov, USSR 1982
Analysis by Fritz 11: depth 25/44 time 13.5min
1. = (0.00): 43.Bd8-c7 Rb7xc7 44.Qf6-d8+ Kg8-g7 45.Qd8-f6+ Kg7-g8 2.  (-7.43): 43.Bd8-b6 Qc5-d6 44.Bb6-c5 Ne5-g4 45.Bc5xd6 Ng4xf6 46.Rf1-b1 Nf6xe4 47.Bd6-a3 Ne4-f2+ 48.Kh1-h2 Nf2-d3 49.Ba3xb2 Nd3xb2 50.Rb1-a1 a5-a4 51.Kh2-g3 Kg8-f7 52.Kg3-f3 Rb7-b3+ 53.Kf3-e4 (, 14.02.2008)
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Feb-13-08
 | | playground player: Found the draw, but couldn't find a win. Guess I'd have to tell Kasparov, "On me you shouldn't depend." |
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| Feb-13-08 | | johnlspouge: <<wals> wrote: 1. (0.00): 43.Bd8-c7 Rb7xc7 44.Qf6-d8+ Kg8-g7 45.Qd8-f6+ Kg7-g8 2. (-7.43): 43.Bd8-b6 Qc5-d6 44.Bb6-c5 Ne5-g4 45.Bc5xd6 Ng4xf6> Thanks for today's analysis of the second-best move, <wals>! (I am beginning to miss <MostlyAverageJoe>...) |
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| Feb-13-08 | | wals: Of all the 10 to the power of 128 positions available I had to miss that one! |
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Feb-13-08
 | | eternaloptimist: This puzzle is too tough for a Wednesday. I never even looked @ the move ♗c7. I was too busy looking for a win instead of a draw. I was too much of an optimist :-). Basically Kasparov's idea was to vacate the d8 square for the ♕ to get a perpetual. |
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| Feb-13-08 | | TheaN: 3/3
Woah! Got into the exact direction I neeeded to into, not knowing White only could get a draw. 43.Bc7! salvages at least a half point with the Qd8 with Bxe5+ threats. Black has a few ways to respond: 43....Qxc7?? 44.Qf8#
43....b1=Q?? 44.Qd8+ Kg7 (Qf8 45.Qxf8#) 45.Bxe5+ Kh6 (Qxe5 46.Qf8#) 46.Qh4# 43....Nd7/Ng4 44.Qxe6+ Kh8 45.Qe8+ leading to a definite draw. Although it might be winning those lines are getting me crazy and Black should play optimal anyway. 43....Rxc7 44.Qd8+ Kg7 (Qf8 45.Qxf8#) 45.Qf6+ Kh6 (Kg8 46.Qd8+ Kg7) 46.Qh4 = perpetual. Great play by Garry.
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| Feb-13-08 | | DarthStapler: I was looking for a win so I didn't even have the idea of going for a perpetual |
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| Feb-13-08 | | patzer2: For today's Wednesday puzzle solution, Kasparov forces a draw by perpetual with the surprise clearance sacrifice 43. Bc7! See <Wal>'s Fritz 11 analysis for more detail. |
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| Feb-13-08 | | Marmot PFL: Harder than the usual 2 star. Bc7 is not an obvious move. |
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| Feb-13-08 | | jovack: I actually didn't solve this one. I kept trying to solve for a win, and eventually gave up because I saw nothing that could be done. Perhaps next time it should say white to play and draw... like other puzzles, but whatever, now I'm aware that these puzzles just imply "best move" not necessarily "win". |
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| Feb-13-08 | | jovack: I bet Vladimir started getting excited "yes I'm gonna beat the world's best!!" |
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| Feb-13-08 | | YouRang: <eternaloptimist><Basically Kasparov's idea was to vacate the d8 square for the Q to get a perpetual.> Yes, but as with all clearance sac's, the piece 'doing the vacating' must carry a payload of its own. In this case, only ...Bc7!! delivers, since it prevents both the white rook & queen from guarding d8, making the perpetual possible. |
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| Dec-27-19 | | Howard: According to the Informant, White missed 2-3 wins all on the same move... ...but I don't recall which move except that it was around the 41st move. |
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