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| Jun-20-15 | | Tiggler: <Tiggler: <dfcx: saw first three moves starting with 27.Qg6, but did not see 30.Bd5.> Same with me. I have trouble seeing the board more than 2-3 moves ahead. I chose 27.Qg6, though, intending to continue with 30.Ra7 . That also seems to win, though it is not so convincing as 30.Bd5 > I meant 30.Ra8, and yes it does win. |
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| Jun-20-15 | | thickhead: 30.Bd5 Bf5 31.Bg8+ Kh8 32.e6 Bxe6 33.Bxe6+ Kh7 34.Bg8+ Kh8 35.Bd5+ Kh7 and now defensive 36.Rf2 or aggressive 36.Rf7 should win for white. |
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| Jun-20-15 | | Patriot: <<al wazir> 27. Qg6 is an obvious choice and I would have played it OTB, since it costs white nothing. (He is assured of getting his material back). But I had no continuation in mind and no plan for converting it into a win. I probably would have played 30. Rf2 to defend the b-♙> Exactly! It's a perfectly safe blitz move at no cost. I considered 30.h4 and a few possibilities there plus 30.Re8 but after 30...Bf7 31.Re7 I didn't think about simply winning a pawn as <agb2002> pointed out. But I knew that with more thought if nothing panned out, there is always Rf2. I don't think a GM would want to use that thought process though because at that level it would be embarrassing to get into a drawn position so easily without thorough analysis. I'm amazed at how they often find best moves with subtle differences in evaluation. |
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| Jun-20-15 | | patzer2: <1. e4 c5 2. Nf3 e6 3. c4> This early alternative in the Sicilian is not bad. Fritz rates it equal, and actual results of Master games seem to support this assessment. Of 641 games played with 3. c4 in the chessgames.com Opening Explorer (OE,) White won 33.4% and black won 31.8%. Far more popular and slightly more successful is the usual 3. d4. Out of 23,575 games with 3. d4 in the OE, White won 35.7% and Black won 31%. <3...Nc6 4. Nc3 Nf6 5. Be2 Qb6> Most often played is 5... d5. Black seems to secure easy equality after 5...d5 6. exd5 exd5 when play might continue 7. d4 Be6 8. cxd5 Nxd5 9. O-O Be7 10. dxc5 Bxc5 11. Ng5 = (+0.24 @ 23 depth, Deep Fritz 14) as in the drawn Super GM game D Andreikin vs Jakovenko, 2012. <6. O-O d6 7. a3 Be7 8. Rb1 a5> This move is OK and should lead to equality. However, another playable try is 8... Nd4 9. b4 Qd8 10. d3 O-O = (+0.23 @ 20 depth) as in the drawn GM game J Smeets vs S Mareco, 2012. <9. d3 O-O 10. Be3 Ng4 11. Bd2 Nge5 12. Nxe5 dxe5 13. Nb5 Nd4 14. Nxd4 exd4 15. a4 e5 16. f4 exf4 17. Bxf4 Ra6> Though Fritz assesses it equal, 17...Ra6 looks awkward. My preference is 17... Bd6 when play might continue 18. Bg4 Bxg4 19. Qxg4 Bxf4 20. Rxf4 Rad8 21. Rbf1 Rd6 22. Rf5 h6 23. Qf4 Rg6 24. g3 Qb3 25. Rxf7 Rxf7 26. Qxf7+ Kh7 27. Qf3 Rf6 28. Qe2 Rxf1+ 29. Kxf1 Qxa4 30. e5 = (+0.07 @ 24 depth). <18. e5 Qd8 19. Bf3 Bg5 20. Bd5 Bxf4 21. Rxf4 Qe7 22. Qf3 Rb6 23. Rf1 Be6 24. Qg3 Qd8> Here I like <RV>'s suggestion 24...Kh8, where Fritz concurs with Rybka's assessment of equality after 24...Kh8 25. R1f2 = (+0.10 @ 26 depth). <25. Be4 Kh8 26. R1f2 h6?> This is the clear losing move. Instead, Black can hold on and make a fight of it with 26... Rb4 when Fritz indicates play might continue 27. Rh4 g6 28. Rf6 Rg8 29. Bxg6 fxg6 30. Rxe6 Rxb2 31. h3 Re2 32. Rf4 Rf8 33. Rd6 Qe7 34. Rff6 Rf7 35. Rde6 Qf8 36. Qf3 Re1+ 37. Kf2 Re3 38. Rxf7 Rxf3+ 39. Rxf3 Qh6 40. Kg3 Qg5+ 41. Kh2 Kg7 42. Rff6 Qe3 43. Re7+ Kh6 44. Rf3  (+0.81 @ 24 depth). <27. Qg6!> This solves today's Saturday puzzle. In my attempt at solving it, I found 27. Qg6! almost instantly but missed a winning follow-up. Tempting but not a clear win for White is 27. Rf6 as Black holds on after 26...gxf6 28. Rxf6 Bf5! 29. Rxf5 Qe7 30. Qf4  (+0.64 @ 24 depth). <27... fxg6 28. Rxf8+ Qxf8 29. Rxf8+ Kh7 30. Bd5> I missed this essential winning follow-up, settling too quickly for the passive 30. Rf2 =. <30...h5> If 30... Bf5, White wins after 31. Bg8+ Kh8 32. e6! Bxe6 33. Bxe6+ Kh7 34. Bg8+ Kh8 35. Bd5+ Kh7 36. Rc8 Rxb2 37. Rxc5 Rd2 38. Be4 Rd1+ 39. Kf2 Rd2+ 40. Kf3 Ra2 41. Rxa5  (+9.92 @ 22 depth). <31. h4 g5 32. Be4+ g6 33. Rf6 gxh4 34. Bxg6+ Kg7 1-0> Black resigns in lieu of 35. Bf7! when play might continue 35...Rxb2 36. Bxe6 Re2 37. Rf7+ Kg6 38. Rxb7 Rxe5 39. Bd5 Re1+ 40. Kf2 Ra1 41. Be4+ Kf6 42. Rc7 Rxa4 43. Rxc5 Ra2+ 44. Kf3 Ra1 45. Rxh5 a4 46. Kf4 a3 47. Rh6+ Ke7 48. Ra6 a2 49. Ke5 (+9.74 @ 21 depth). |
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| Jun-20-15 | | houtenton: And what about 27.Rf6 gxf6 followed immediate by 28.Qh4?
F.i. 28..Kg7 29.exf6+. |
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| Jun-20-15 | | TheaN: Did get the initial moves but missed 30.Bd5!! which is an amazing zugzwang move. I went for 30.h4?! directly, which keeps some advantage (due to the h5 threat) but surrenders the zugzwang idea. Typically, some engines have the option to analyze the threat of the opponent (so half ply ahead). A great resource, that makes it much easier to find the idea behind moves that look illogical at first sight. A zugzwang move is an amazing exception; the 'threat' of 31.Ra8 evaluates the same as 30.Bd5, truly showing it's black that's destroying his own position. After 30....h5 31.h4 he's out of any sensible moves. |
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| Jun-20-15 | | RandomVisitor: <houtenton>28...f5! = is the only weakness in that line. |
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| Jun-20-15 | | devere: This is a very subtle problem.
After 27. Qg6! fxg6 28. Rxf8+ Qxf8 29. Rxf8+ Kh7 30. Bd5 h5 31. h4 Black is in zugzwang. 
click for larger viewMy admiration to Ehlvest for actually seeing this over the board. After 27. Rf6 gxf6 28. Rxf6 Bd5!!
click for larger view
White has no better than a draw with 29. Qf4! |
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| Jun-20-15 | | CHESSTTCAMPS: Material is even, but white is directing overwhelming force at the black king-side and there is only one defender for the squares adjacent to the king. The first move that occurred to me was 27.Qg6, but I under-analyzed it and set it aside. Thinking there must be a winning attack against the castled position, I looked at 27.Rf6, considering 27...gxf6 28.Rxf6 (exf6 Rg8 29.Qh4 Qf8) Bg4 and black seems to hold, with a material advantage. Then I saw more tactical possibilities in the original idea: 27.Qg6! threatens mate and forces a dangerous passed pawn. 27... fxg6 (f5 exf6 e.p and black can't defend the two mate threats) 28.Rxf8+ Qxf8 29.Rxf8+ Kh7 30.Bd5!! The point! Black's pieces are tied up and white's pawns more dangerous. A. 30... Bf5 31.g4! Bxd3 (Bxg4 32.Bg8+! Kh8 33.Bd6+ Kh7 34.Bxg4 and black must spend the rook to stop the e-pawn) 32.e6 g5 33.e7 Bg6 34.Bg8+! Kh8 35.Bf7+ wins. B. 30... Bd7|g4 31.Bg8+ Kh8 32.Be6+ wins bishop and promotes the e-pawn C. 30... Bxd5 31.cxd5 c4 32.d6 cd 33.d7 d2 34.Rf1 ends counter-play. D. 30... g5 31.Bd4+ g6 32.Rf6! (a decisive pin) Ra6 33.Rxg6 Kh8 34.Rxh6+ Kg7 35.Rg6+ Kf7 36.Rf6+ Ke7 37.Bd5 trades off the remaining pieces. Time for review... |
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| Jun-20-15 | | Cheapo by the Dozen: Like many, I stopped after failing to find a win starting with Rf6. I saw a couple of defenses I couldn't beat, neither of which was <devere>'s. (One was ... Bf5.) |
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| Jun-20-15 | | CHESSTTCAMPS: Failed to analyze 30... h5 (the game defense), but it plays out very similarly to my line D. |
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| Jun-20-15 | | Whitehat1963: Don't know how far I was supposed to see, but I certainly saw the queen sac right away. What I didn't count on was that after the exchange both sides would be left with a rook and a bishop. And for some reason I thought 29. Rxf8+ would be 29. Rxf8# instead. |
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| Jun-21-15 | | pmukerji: What happens if 30...Bf5 in the game line? |
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Jun-21-15
 | | perfidious: <pmukerji: What happens if 30...Bf5 in the game line?> That is answered by 31.Bg8+ Kh8 32.e6. |
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| Jun-22-15 | | pmukerji: Got it...thank you...such cool tactics... |
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| Nov-23-24 | | alshatranji: I saw the first few moves including Bd5, but I wasn't sure it was a clear win. I ended up with 27. Rf6, which is not bad, but not as effective. I suppose this is what happens when you overthink the position. |
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| Nov-23-24 | | mel gibson: I didn't see that,
you'd have to be a brave player to sac your Queen.Stockfish 17 says:
27. Qg6
(27. Qg6 (1.Qg6 fxg6 2.Rxf8+ Qxf8 3.Rxf8+ Kh7 4.Bd5 h5 5.h4 Bg4
6.Bg8+ Kh6 7.e6 g5 8.e7 Bd7 9.Bf7 g6 10.Rg8 Kh7 11.hxg5 Bxa4 12.e8Q Bxe8
13.Rxe8 Rxb2 14.Ra8 a4 ) +5.03/45 300)
score for White +5.03 depth 45. |
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| Nov-23-24 | | King.Arthur.Brazil: The king's line is: 27. Rf6 gxf6 28. exf6 Rg8 29. Qh4 Rg6 30. Bxg6 fxg6 31. Qxh6+ Kg8 32. Qg7# However, B can defend with ingenuity: 27... Bc8 28. Rxf7 Rxf7 29. Rxf7 Qg8 30. Bd5 Be6 31. Rxb7 Rxb7 32. Bxb7 g6 33. Qf4 Qg7... W has only an extra ♙. For this reason, W can be more decisive with 28.Qg6!! (any other move, 29.Qh7#, so it's a forced reply) fxg6 29. Rxf8+ Qxf8 30. Rxf8+ Kh7 31. Rxc8 Rxb2 32. Rxc5 with an extra ♗ and better position. |
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Nov-23-24
 | | scormus: Oh, it's one of those puzzles that goes to a winning endgame position.
I didn't seriously look at 27 Qf6. I tried to make something out of 24 Rf6 but B can defend against the threats on the K. It also comes out with an advantage for W though not as good as the text. |
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Nov-23-24
 | | Teyss: I saw 27.Qg6, it's a classic theme at least since S Levitsky vs Marshall, 1912, as well as the following simplification, but wasn't sure White was winning since I missed the powerful 30.Bd5! Black cannot exchange the Bishops else the 2 central Pawns are too strong and if 30...Bf5, 31.Bg8+ Kh8 32.e6! better than 32.Be6+ just winning a Pawn. 
click for larger viewSo Black is stuck and White can quietly improve his position. The whole combination up to 30.Bd5! makes it Saturday level indeed. |
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Nov-23-24
 | | chrisowen: Like faith its wu divvy its z Qg6 get its huh its adagio its nug cat Qg6 co! |
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| Nov-23-24 | | Allderdice83: I obviously need some more practice at analysis. I had 27. Rf6 instead of 27. Qg6. That's still good, but after 27 ... gxf6, I had 28. exf6?? which loses to 28 ... Rg8 29. Qh4 Qf8. 29 ... Qf8 is really not that hard a move to see, but I somehow missed it. After 27. Rf6 gxf6 28. Rxf6 Bd5, 29. Rxb6 Qxb6 30. cxd5 f5 31. Bf3 Qc7, or 28 ... Bf5! 29. Rxf5 Qe7 30. Qf4 Kg7 31. Rh5 Rg8 32. Bd5 Rg6 , White is clearly better, but Black is hanging on. I saw 27. Qg6 fxg6 28. Rxf8+ Qxf8 29. Rxf8+ Kh7 but didn't see how White got any winning advantage from there, with material equal. |
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| Nov-23-24 | | Allderdice83: Also note; after 27. Rf6 gxf6 28. Rxf6 Bc8 (or Bd7), White has 29. Qh4, and on 29 ... Rxf6 30. exf6, White is in the 28. exf6 line with rooks traded but a move ahead, which makes all the difference between winning and losing. Black can only stave off mate a few moves with 30 ... Qxf6 31. Qxf6+ Kg8 32. Qxh6 f5 33. Bd5+ Be6 34. Bxe6+ Rf7 35. Qg6+ Kh8 36. Qxf7 f4 (or b6 or b5) 37. Qg8# |
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| Nov-23-24 | | King.Arthur.Brazil: Brilliant, <Alderdice>, but let me help a little my mistake too, using your good analyses: 7. Rf6 gxf6 28. Rxf6 Bd5, now reply 29. Qh4 too, when Rxf6 30. exf6 Bxe4 31. Qxh6+ Bh7 32. Qg7# in fact wins. Therefore, B must reply: Qxf6 31. Qxf6+ Kg8 32. Bxd5... end game. |
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| Nov-23-24 | | King.Arthur.Brazil: Another possibility: 27. Rf6 gxf6 28. Rxf6 Bg4 29. Qh4 Rxf6 30. exf6 h5 31. Qg5... |
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