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Jan-06-18
 | | OhioChessFan: 28. Rg1 Rg6 and pretty much the rest follows the game. |
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Jan-06-18
| | OhioChessFan: Okay, <plumb> already got there. |
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Jan-06-18
 | | al wazir: <OhioChessFan: 28. Rg1 Rg6> 29. Nc2. Now what? |
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| Jan-06-18 | | mel gibson: I saw that first move straight away.
It just puts more pressure on the g2 square.
Stockfish 8 says:
27. Qf2 c5 (27. .. c5 (c6-c5 ♖d1-g1 ♖h6-g6 ♗g2xb7 ♖g6xg1
♗b7-g2 ♖g1-c1 ♘a3-c2 ♕g7-h6 b2-b3 ♗b8-d6 ♘c2-e1 c5xd4 ♖d2xd4 e6-e5 ♖d4-d5
♗d6-e7 ♘e1-f3 e5xf4 ♕f2-b2+ ♕h6-g7 ♕b2xg7+ ♖g8xg7 e3xf4 ♖c1-c2 ♖d5-d2
♖c2xd2 ♘f3xd2 ♗e7-d6 ♔h2-g1 ♗d6xf4 ♘d2-b1 ♖g7-c7 ♘b1-a3 ♖c7-c1+ ♗g2-f1
♔h8-g7 ♔g1-g2 ♔g7-f6 ♗f1-c4 ♔f6-e5 ♔g2-f2 ♔e5-e4 ♔f2-e2 ♖c1-h1 ♗c4-d3+
♔e4-e5 h3-h4 ♖h1xh4 ♘a3-c4+ ♔e5-e6 b3-b4 ♖h4-h2+ ♔e2-f3) +3.45/35 147) score for Black +3.45 depth 35 |
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| Jan-06-18 | | plumbst: <al_wazir> 29.Nc2 cxd4. The e-pawn and Rook are overworked, and the other capture 30.Nxd4 e5 leads to a fatal opening of lines. |
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| Jan-06-18 | | The17thPawn: On 28.Rg1 I though ...Qg4 did the trick. |
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| Jan-06-18 | | WorstPlayerEver: Took me a quarter before I figured out the toughest variation pfewwww |
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| Jan-06-18 | | engmaged: 12...Nxd5 what a nice move? resisting the discovery ... instead targeting the f4 bishop. Is it theory? |
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| Jan-06-18 | | WorstPlayerEver: At some point I thought I had a déjà vu regarded to c6-c5. Like I had seen the position before. But that is what you get after 20 hours of chess ;) |
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| Jan-06-18 | | patzer2: Today's Saturday puzzle (27...?) was an extremely difficult one, requiring a subtle preparatory move to initiate a decisive attack. The strongest solution is the game move 27...c5!, when Stockfish 8 gives best play as 27...c5! 28. Rg1 Rg6 29. Bxb7 Rxg1 30. Bg2 Rc1 -+ (-4.10 @ 30 ply). My attempt was 27...Rg6, which appears to be winning after 27...Rg6 28. Nc4 b5 29. Ne5 Rg3 30. Nf3 c5 31. Bh1 c4 32. a4 b4 -+ (-2.60 @ 35 ply, Stockfish 8). P.S.: White's game takes a turn for the worse with 18. Qe2 Rf6 19. Rd2? Rh6 ∓ (-0.83 @ 29 ply, Stockfish 8). Instead, 18. Ne2 = (0.00 @ 28 ply, Stockfish 8) would have held it level. And 19. Nb1 Qd7 20. Nd2 = (0.00 @ 33 ply, Stockfish 8) would also have given White an even game. |
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| Jan-06-18 | | yadasampati: I had 27. ... c5. For me that is good enough! |
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| Jan-06-18 | | gofer: I think the main idea to see in this POTD is that Bg2 is stuck defending Ph3.
If Bg2 goes walk-about, then there is a nice little mate in four on offer...
click for larger view1 ... Rxh3+
2 Kxh3 Qg4+
3 Kh2 Qh5+
4 Qh4 Qxh4#
Once I saw this, the c6-c5 pawn push is obvious, because we can open the h1-a8 diagonal with impunity. Bb7 is not subject to any form of attack and is free to travel along that diagonal at will. <27 ...c5>
I think the secondary idea that we needed to see was that Bb8 isn't quite in the game at the moment, but easily could be if we can open up the h2-b8 diagonal. For this reason, I feel that <28 dxc5> must be flawed and cannot be expected as a response after the pawn push. The reason
being, the line that was played <28 ...e5>, does start to open up yet another attacking line to the poor old white king. Instead, while Pd4 stays on d4, Bg8 is kept out of the game. I felt <28 Nc2> offered more chances for white. One continuation for black seemed to be to make use of the pawn majority it has and play <28 ... c4>, but I was already in the realms of guess-work... One nice thing in hindsight was seeing that rook sacrifice was still played! 1 ... Rxh3+
2 Kxh3 Qg4+
3 Kh2 Qh5+
ended up being
31 ... Rxh3+
32 Kxh3 Qg4+
33 Kh2 Qh5+
Not quite for exactly the same reasons, but with a more or less deadly outcome! <gofer> half a point, maybe more. |
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| Jan-06-18 | | malt: Took a while to see, to decoy the Bishop with <27...c5>
(28.B:b7 R:h3+ 29.K:h3 Qg4+ 30.Kh2 Qh5+ mates)
28.Rg1 Rg6
or 28.dc5 opening the file, and a threat of 29.c6 |
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| Jan-06-18 | | Marmot PFL: Black needs the bishops to continue the attack, so at least the first move is not too difficult. 27...c5 28 dc5 e5 and now both bishops are active. 29 Bxb7 loses to 29.. Rxh3+ and 30...Qg4+, while 29 fe5 Qxe5+ is equally bad. |
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Jan-06-18
 | | agb2002: Black has the bishop oair for a bishop and a knight. White is probably about to play Nc4-Ne5.
If the white bishop were removed from the board, Black would deliver mate in four with 27... Rxh3+ 28.Kxh3 Qg4+ 29.Kh2 Qh5+ 30.Qh4 Qxh4#. This suggests 27... c5: A) 28.Bxb7 Rxh3+ as above.
B) 28.dxc5 e5 looks very strong.
C) 28.Nc4 cxd4 seems to win (29.Rxd4 Qxg2+; 29.exd4 Bxf4+ 30.Qxf4 Qxg2+ 31.Rxg2 Rxg2+ 32.Kh1 Rxh3+ 33.Qh2 Rhxh2#. D) 28.Rg1 Rg6 pinning the bishop followed by cxd4 or e5 looks very good for Black. E) 28.d5 Bxd5 wins a pawn at least. |
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| Jan-06-18 | | hdcc: I spent some time looking at this and couldn't spot a thing, so I applied the WWIDITWMG ("What would I do if this were my game") principle (Chris Owen would really love that). Funnily enough, I plumped for the unobtrusive c5, but I admit that I didn't foresee all that transpired after that (I need my vision to catch up to my intuition). |
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| Oct-04-19 | | RandomVisitor: The computer likes 28...Bxg2, but 28...e5 also works. |
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| Oct-04-19 | | EIDorado: c5 is very easy to see. The problem is this position is a "calculate till checkmate" position. Going into a variation jut because it "looks good" is a recipe for disaster. |
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| Oct-04-19 | | mel gibson: What's going on?
All the replies including an old reply from me are talking about move 27
when the puzzle calls for move 28. |
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| Oct-04-19 | | Walter Glattke: No senseful sacrifice, 29.-e5 breaks the balance: 29.Rg1? exf4 30.exf4 Rxh3+ 31.Bxh3 Bxf4+ 32.Qxf4 Qxg1# 29.e4!? exf4!? 30.Qd4 f3+ 31.Kh1 -+ or 31.e5 Qg3+ 32.Kh1 Rxh3+ 33.Kg1 Qe5 -+ 29.Rd7 exf4 30.Rxg7 fxe3+ 31.Kg1 (31.Kh1 Rxh3#) exf2+ 32.Kxf2 Rxg7 33.Rd8+ Rg8 34.Rxg8+ Kxg8 35.Bxb7 Rxh3 -+ |
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| Oct-04-19 | | Walter Glattke: 29.-Bxb2 should be better, so the M.G. Computer Shows. |
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Oct-04-19
 | | Willber G: <mel gibson: What's going on? All the replies including an old reply from me are talking about move 27 when the puzzle calls for move 28.> It was previously a Saturday puzzle starting a move earlier. |
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| Oct-04-19 | | dhotts: My first choice was 28...Bxg2 to clean up the mess (reduce complexity) in the ensuing phase 29.Qxg2 Rg6 30.Qf1 then play 30...e5 with much greater effect! |
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Oct-04-19
| | agb2002: Level 3: 23.?
Capablanca vs O Chajes, 1913
click for larger view |
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| Oct-07-19 | | patzer2: <RandomVisitor: The computer likes 28...Bxg2, but 28...e5 also works.> Indeed! As the solution to our Friday Oct 4, 2019 puzzle (28...?), Black wins easily with 28...e5 -+ (-5.73 @ 42 ply, Stockfish 10) or 28...Bxg2 29. Qxg2 Rg6 -+ (9.06 @ 42 ply, Stockfish 10). P.S.: So where did White go wrong? White's game went bad with 19. Rd2? allowing 19...Rh6 ∓ to -+ (-1.61 @ 30 ply, Stockfish 10). Instead, 19. Nb1 Rh6 20. Nd2 = (-0.09 @ 31 ply, Stockfish 10) would have held it level. |
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+ sac: 30...Rxb8