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| Dec-21-08 | | goodevans: Strange sort of Sunday this. Checked it out this morning and very little kibitzing, and now again at the end of the day (UK time) and not much more. Why is this? I guess because (a) the Rxd6+ sac was so obvious, and (b) working out whether it works is so difficult. To me the other big question I was wrestling with this morning was whether to play the sac straight away or exchange B for N (12 Bxf6) first. I was worried about moves like 12 Rxd6 Nxe4 which looked really messy, but I see now that johnlspouge has posted a refutation to that line. In a game, if I’d have been brave enough to play the sac at all then I think I’d have traded B for N first. Would this have been wrong? |
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| Dec-21-08 | | johnlspouge: < <goodevans> wrote: [snip] To me the other big question I was wrestling with this morning was whether to play the sac straight away or exchange B for N (12 Bxf6) first. > I looked at 12.Bxf6 as well, so I put it through Toga. It yields a little pull for White, but no win. I rejected it, because (as in the game) the White dark square B squeezes the Black K. |
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| Dec-21-08 | | dzechiel: White to move (12?). Material even. "Insane."
The move that immediately announces itself to me is
12 Rxd6
But that's about as far as I want to take it. Should black capture the rook with 12...Bxd6
then
13 Qxd6
leans on the remaining black bishop and gives white time to play 14 e5. But the fly in the ointment is the fact that black is not obligated to take the rook. He can choose to move the light squared bishop, or protect said bishop with the queen or rook. I wish I had more time to work on this. Time to check and see how it all went down. |
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| Dec-21-08 | | TheBish: The only thing I'm looking at is 12. Rxd6!, which I believe leads to a winning attack. Can't see it to a conclusion (which helps to make it insane), but I would call it an intuitive sacrifice, since if 12...Bxd6 13. Qxd6, not only doesn't Black ever castle, but White is threatening not only 14. Qxc6+ but also 14. e5. One defense is 12...Nxe4 13. Nxe4 Bxe4, but it looks like that can be met strongly by 14. Rhd1, threatening 15. Rd8+ and also with ideas of 16. Qe5 planning 17. Rxe6+. If Black declines the rook offer (wise), with either 12...Bb7 or 12...Rc8, White should continue 13. Bxf6 gxf6 14. Bh5!, threatening 15. Rxe6+. Beyond that, I can't see it to conclusion (probably a dozen or so moves to go), but it looks like a crushing attack, with White winning the e6 pawn along the way in many lines. |
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| Dec-21-08 | | MaczynskiPratten: It's been an interesting week - the theme seems to have been that a one-mover intuitively jumped out of each position as soon as you looked at it. BUT .. on some days the followup was so complex as to be almost incalculable (Thu, Sun), in one case the intuitive sacrifice didn't work due to a sucker counterpunch (Wednesday's "spoiler") and on Sat the intuitive move nearly works (fxg6) but there is a much stronger move available (Re1). And Fri was an endgame where the first move looked fairly obvious but it wasn't easy to see exactly why it was best - a subtle zugzwang. Altogether, a nice mix, thanks Chessgames (as always). |
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| Dec-21-08 | | PinnedPiece: I really think that taking the Rook at move 12... holds out longer but definitely loses. 12...Bxd6 13.Qxd6 Bd7 14.Rd1 0-0-0 15.e5 h6 16.exf6 hxg5 17.fxg7 Rhg8 18.Nd5 exd5 19.Rxd5 g4 20.b4 Qa3+ 21.Kb1 Kb7 22.Rd3 Qa4 23.Qe7 Kc8 24.Bxg4 Bxg4 25.Rxd8+ Rxd8 26.Qxd8+ Kxd8 27.g8=Q+ Ke7 28.Qxg4 
click for larger view |
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| Dec-21-08 | | njchess: I got this one. I think White's 15. Bh5 was the most difficult part of the puzzle. I'll post more tomorrow when I have time. |
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| Dec-21-08 | | zzzzzzzzzzzz: i got it. |
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| Dec-22-08 | | zzzzzzzzzzzz: i think white only has + = after rxd6 but after rxe6+ he has+ - |
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| Dec-22-08 | | njchess: I think for most who analyzed this position, Rxd6 was at least a possibility. Most I think examined it in the context of 12. Rxd6 Bxd6 13. Qxd6 Qb6, and, if it was rejected, it was because the resulting position didn't justify exchanging a rook for a pawn and a bishop. I disagree. The following position results after 12. Rxd6 Bxd6? 13. Qxd6 Qb6: 
click for larger viewBlack cannot castle much less get his king side rook into the game from this position. He has already spent a move (Qb6) defending hanging pieces and will need to spend more to secure his king. After 15. Bh5! Qb7 16. Qxe6+ Kf8 17. Qd6+ Kg8 Black's other central pawn falls. 13. ... Rc8 is slightly better for Black but is still losing (e.g. 12. Rxd6 Bxd6 13. Qxd6 Rc8 14. e5! Qc7 (best?) 15. Qxc7 Rxc7 16. exf6 Rg8). White has a bishop, a knight and a pawn for his rook, and the better position. To Black's credit, I think he saw Bxd6 as intuitively bad and played 12. ... Rc8. Also playable was Bb7, but backward bishop moves can be difficult to see, and Black may simply have wanted to get his rook to the half open c-file. After 13. Bxf6 gxf6 14. Bh5! must have been a shock for Black. It's tough to see moves from the rear like that especially when all the action is happening right on your doorstep. 14. ... Bh6+ is a natural reply if you have already concluded that Bxd6 is losing. At this point, Black is headed for a bad endgame position at best. 15. Kb1 b4? is a costly mistake. Black thought to perform a nifty tactical fork with his pawn and queen, but defending his king should have been the priority. The text move also shows that he completely missed the subtle Rxe6+. Slightly better would have been Ke7, though e5 would be a concern. The more forceful 17. Qd6+ is played by White over the quieter but equally sound Qf3. From there, Black is forced to trade pieces as well as lose pieces in exchange for protecting his king. At the end, down four pawns, Black resigns. This game also illustrates how far Najdorf theory has progressed. 7. Qf3 is played with the intent of moving the queen to g3. It is little played because White will usually need to play f4 at some point, and committing the queen this early in the game is premature. Black's reply of 7. ... Bd7 is even more unusual. h6, Nbd7 are the more common responses. Be7 is also playable. The text move forces Black to play Nc3 if he wants to develop his knight. I'm not a fan of 9. ... Qa5 because 1) after 10. Bxf6 gxf6 11. Qxf6 Qe5 12. Qxe5 Bh6+ 13. Kb1 Nxe5 14. Rhf1 I think White is better, and 2) it also allows White to play Qg3 without loss of tempi. Better is Be7. |
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| Dec-24-08 | | patzer2: For the Sunday Dec 21, 2008 puzzle solution, White exploits the weak Black King position with the exchange sacrifice 12. Rxd6!! |
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| Jan-02-09 | | xrt999: < JG27Pyth: I think you've followed the board wrong. Your notation 19...Rab8 doesn't make sense which leads me to believe you misplaced that rook when you analyzed the line... there's a rook on c8, so if 16...Qe7 white has 17.Qxc8+> Ok, sorry about that, I misplaced the rook when I set the board up,,, |
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| Feb-20-22 | | Brenin: I saw immediately that 12 Rxd6 Bxd6 13 Qxd6 was possible, within a minute that Black had no immediate refutation, and within a few minutes more that it gave White a commanding position, e.g. 13 ... Rc8 14 e5, or 13 ... Qb6 or Bb7 14 Bh5 threatening 15 Qxe6+. All these lines were analysed thoroughly back in 2008, including the decline of the R sac, and there is little I can add to that. |
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| Feb-20-22 | | mel gibson: I saw the first ply after about 20 seconds
as the only way forward.
Stockfish 14 is giving only a tiny
advantage to White -
it's close to a draw.
12. Rxd6
(12. Rxd6 (♖d1xd6 ♖a8-c8 ♗g5xf6 g7xf6 ♗e2-h5 ♗f8xd6 ♕g3xd6 ♕a5-c7 ♕d6xe6+ ♔e8-f8 ♕e6xf6
♖h8-g8 ♕f6-h6+ ♖g8-g7 ♗h5-g4 ♖c8-d8 ♗g4-f3 ♕c7-d6 ♕h6-e3 ♕d6-d4 ♘c3-d5
♕d4xe3+ f2xe3 ♖g7-g6 h2-h3 ♖g6-e6 ♖h1-d1 ♖e6-d6 ♖d1-f1 a6-a5 a2-a3 f7-f5
♘d5-c3 f5xe4 ♘c3xe4 ♗c6xe4 ♗f3xe4+ ♔f8-e7 b2-b4 h7-h5 b4xa5 ♖d6-a6 ♖f1-f5
♖a6xa5 ♔c1-b2 h5-h4 ♖f5-h5 ♖d8-d2 ♗e4-c6 ♖a5-a6 ♗c6xb5 ♖a6-e6 a3-a4 ♖d2xg2
a4-a5 ♖g2-g7 ♗b5-d3 ♖e6xe3 a5-a6 ♔e7-d6 ♖h5xh4) +1.45/42 238) score for White +1.45 depth 42. |
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Feb-20-22
 | | An Englishman: Good Evening: Back in my playing days, this would have counted as a "sac first, think later" type of position. 6/7 for the week, flubbed Saturday. |
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| Feb-20-22 | | Lloyd Gross: I tried 12 Rxd6 Bxd6 13 Qxd6 Rd8.
It sure looks like a "sac first, think later" position. |
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| Feb-20-22 | | agb2002: Black threatens Nxe4 and b4.
The first idea that comes to mind is 12.Rxd6:
A) 12... Bxd6 13.Qxd6 (threatens Qxc6+ and Bh5-Qxe6) A.1) 13... Rc8
A.1.a) 14.Bh5 Bd7 (14... Nxh5 15.Qe7#) 15.Bxf6 gxf6 16.Bxf7+ Kxf7 (16... Kd8 17.Bxe6 with three pawns for the exchange) 17.Qxd7+ Kg6 (else 18.Qxc8+ wins) 18.Qxe6, unclear (Black has Rxc3). A.1.b) 14.e5 Ng8 15.Rd1, with the threats Bf3 and Bh5, must be winning. A.2) 13... Bd7 14.Rd1 Rd8 (14... Ra7 15.Qb8+ wins decisive material) 15.e5 A.2.a) 15... Ng8 16.Bxd8 Qxd8 (16... Kxd8 17.Qxd7#) 17.Nxb5 axb5 18.Bxd7 wins decisive material. A.2.b) 15... b4 16.exf6 gxf6 (16... Qxg5 17.Qe7#) 17.Bxf6 wins. A.3) 13... Qb6 14.Bxf6 gxf6 15.Bh5 Qb7 16.Qxe6+ Kf7 (16... Kd8 17.Rd1+ followed by Bxf7 or Qxf7) 17.Qxf6 with three pawns for the exchange. B) 12... Nxe4 13.Nxe4 Bxe4 14.Rd4
B.1) 14... Bd5 15.Rxd5 exd5 16.Qe3+ Kd7 17.Rd1 looks very good for White. B.2) 14... Bc6 15.Rhd1
B.2.a) 15... Be7 16.Bxe7 Kxe7 17.Qd6+ wins.
B.2.b) 15... Qxa2 16.Rd8+ Rxd8 17.Rxd8#.
B.2.c) 15... f6 16.Bh5+ Ke7 (16... g6 17.Bxf6) 17.Bf4 must be winning. B.3) 14... Bb7 15.Rhd1 looks similar to B.2.
B.4) 14... Bg6 15.Qf3 Rc8 16.Qb7 Qc7 17.Qxc7 Rxc7 18.Rd8#. C) 12... Bxe4 13.Bxf6
C.1) 13... Bxd6 14.Qxd6 gxf6 15.Nxe4 Qd8 (15... Qxa2 16.Nxf6#) 16.Qc6+ is winning [B+N+P vs r]. C.2) 13... gxf6 14.Nxe4 Bxd6 transposes to C.1.
D) 12... Rc8 13.Bxf6 looks similar to A.1. |
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| Feb-20-22 | | parch: 12.R:d6 B:d6 13.Q:d6 Bb7
14.Bh5 looks good (14.e5 Rd8 ) ...Qd8
(14...g6 15.B:f6 )
15.Q:e6+ Qe7 16.Q:e7+ K:e7 17.e5 |
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| Feb-20-22 | | Pointtaken: I set up the position in Fritz with the engine Switched off to analyse 12.Rxd6 which White's attack arrows point to, lo and behold, it's a book move, (I hadn't closed the opening book!) as are moves 13-16 (based on this game). I think Bh5 is a great move. |
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| Feb-20-22 | | parch: 10...Rc8 looks to be an equal position, instead of
10...b5. |
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Feb-20-22
 | | chrisowen: Rob it i ves auldy Rxd6 finish able it leeway a guff quiff it rob it i ves auldy dazzles it had it hal its walt it wept it v o peg it verb brig bork quickly it vim fan cj u z it sh mad nuy it v i log it want pet barbeque cj it z rc oo ai a jap kid cj it v i hades it i v oh it hi c it v he cc again kong aqua it v oggy bog tog achtung munch body ox i accomodate v it v i muck o for adam it v i na it v i off pac flush muff hi it wash it wash ms acid mid blush hmm it v o cog dr beef v it v he log it v i jock flush mc ban z heed it v i bush cc heed it v i mach it v aced it v i fog ji it shh dj ak it v i slam nn ho it v i had cnds deaf fade it v i jigs jo ho hack hmm v it in lo cc dt he ha be din it v i c z it sad a cab use it biff hell jerk gremlin it to bald fakes it v im tab dr tod hand it v i sash am joch it v i lack then it v i chacha jim mosh dash jo hatch it v i chime it v i hem ja jo c it v i snatch hash chef aus heil bern reg z it v i shin feel it zach it v uber gern heh if it sauce nah it v sam i joch it v i he dt c hash er c ha bruges it v elf it in the chez it v i saul chef grebe it rhine z its hog o c bond it rock x Rxd6 ebb; |
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| Feb-20-22 | | 1stboard: Am I missing some thing in Black resigning ??
If black plays 23 Qc5 then what move does white play on move 24 ?? His ( white ) queen is enprise and has to defend against the black threat of Qxc2 and the bank rank mate. |
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| Feb-20-22 | | King.Arthur.Brazil: Good lucky today! I found the continuation moves: 12.♖xd almost immediately, with possibilities 12...♗xd6 13. ♕xd6 ♖c8 14. e5 or 13...♗d7 14. e5 ♘g8 15. ♖d1 ♖d8 16. ♗xd8 ♕xd8 17. ♕xa6. I really don't calculate much. Black refused the Trojan horse 12...♖c8 If 12...♕c7?? ♖xe6+ win the ♕, while 12...♕b6 pins his own ♕. Other possibility, 12...♗d7 13. ♗xf6 gxf6 14. ♖xd7 ♔xd7 15. ♖d1+ ♔e8 White will have the attack.
Up to 21...♖f8 I would play the same, without hesitation, cause it seems the lonely possible continuation in reality. The King thought in the move 22. ♕a7 ♕xd5 23. ♕xa6 threatening again the f6 p, answering possible 23...♖a8 with 24.♗f3! keeping the advantage and pressure. The game move is also good, because, answer possible 23...♕c5 <2ndboard> (lgs) with 24. ♖c6! is enough. |
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| Feb-20-22 | | Brenin: <1srboard>: <If black plays 23 Qc5 then what move does white play on move 24 ??> 24 Rc6. |
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| Feb-20-22 | | Hercdon: A great lesson for protecting your king. Instead Black horses around with his queen, Allowing white to attack the central king position with Rd6 And eventually realizing a theme around the potential mate at e7 with e5 (the knight cannot move) compelling unwanted exchanges Maybe I can�t walk the block but I�m trying to talk the talk |
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