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| Jun-05-19 | | NBZ: I wondered why the same combo doesn't work on the 26th move: the reason is White's back rank is also weak. 26. Rxe8+ Qxe8 27. Qxd7 is met by 27. ... Rc1+!! 28. Rxc1 Qxd7. Which means 26. h4! is a fiendishly clever move. Now after 26. ... h5??(Black obviously has no clue what's coming) 27. Rxe8+ Qxe8 28. Qxd7 Rc1+ 29. Kh2! and White wins. |
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Jun-05-19
 | | al wazir: 27. Re7 also wins.
A) 27...Rd8 28. Rxd8 Rxd8/Qxd8 29. Qf6 Kf8 30. Qh8+ Ke7 31. Re1+ Kd6 32. Qe5#. B) 27...Rxe7 28. Qxe7 Ra2 29. Qxd7, etc.
C) 27...Nb8 28. Qf6. |
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Jun-05-19
| | al wazir: Why didn't white play 26. Rxe8+ Qxe8 27. Qxd7, etc.? |
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| Jun-05-19 | | agb2002: White has a bishop for a knight.
The weak dark squares around the black king suggest 27.Qf4, aiming a h6: A) 27... Rxe1+ 28.Rxe1
A.1) 28... Qd8 29.Qh6 Nf6 (29... f6 30.Qxg6+ Kf8 31.Qxc2 wins) 30.Bxf6 Qxf6 31.Re8#. A.2) 28... Ra2 29.Qh6 Rxa1 30.Rxa1 + - [R vs n]. A.3) 28... f6 29.Qh6
A.3.a) 29... Ne5 30.Bxe5 wins decisive material (30... fxe5 31.Qxg6+ and 32.Qxc2). A.3.b) 29... Nf8 30.Bxf6 Qd7 31.Qh8+ Kf7 32.Qg7#. A.3.c) 29... Kf7 30.Qh7+ Kf8 31.Qh8+ Kf7 32.Qxc8 wins. A.4) 28... Kh7 29.Qxf7+ Kh6 30.Qg7#.
A.5) 28... Qb8 29.Qxb8+ Nxb8 30.Re8+ Kh7 31.Rh8#. A.6) 28... Qb7 29.Re8+ Nf8 30.Qf6 wins (30... Rc1+ 31.Kh2 Qc7+ 32.g3). B) 27... Qd8 28.Qh6 as above.
C) 27... Nf8 28.Qf6 wins.
D) 27... Ra2 28.Qh6 as in A.2. |
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| Jun-05-19 | | agb2002: The text 27.Rxe8+ Qxe8 28.Qxd7 is far stronger than 27.Qf4, which is also winning. |
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| Jun-05-19 | | jith1207: Great inference, <NBZ>. |
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| Jun-05-19 | | gofer: Like <NBZ>, I saw the threat of <27 ... Rc1+> and thought <GREAT!> this is going to be a brilliant <spoiler>, but then realised there was an
escape for king... ...pity!
Isn't is about time for one?? |
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| Jun-05-19 | | mel gibson: The first move was obvious.
Stockfish 10 says:
27. Rxe8+
(27. Rxe8+ (♖e1xe8+ ♕c8xe8 ♕d6xd7 ♖c2-c1+ ♔g1-h2 ♖c1-e1
♕d7xe8+ ♖e1xe8 ♗a1-f6 g6-g5 d5-d6 ♖e8-e6 d6-d7 ♖e6-d6 d7-d8♕+ ♖d6xd8 ♗f6xd8
♔g8-h7 h4xg5 ♔h7-g6 ♖b1-c1 ♔g6-f5 ♖c1xc5+ ♔f5-e6 ♖c5-c6+ ♔e6-d7 ♖c6-f6
h5-h4 ♖f6xf7+ ♔d7-e6 g5-g6 h4-h3 ♔h2xh3 ♔e6-d5 ♖f7-c7 ♔d5-d4 g6-g7 ♔d4-d3
g7-g8♕ ♔d3-e2 ♕g8-e6+ ♔e2-d1 ♕e6-a2 ♔d1-e1 ♖c7-c1+) +M23/56 291) score for White mate in 23. |
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Jun-05-19
 | | Willber G: <al wazir: Why didn't white play 26. Rxe8+ Qxe8 27. Qxd7, etc.?> 27...Rxc1+ 28.Rxc1 (forced, the K has no escape) Qxd7 |
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| Jun-05-19 | | malt: Have 28.R:e8+ Q:e8 29.Q:d7 Rc1+ 30.Kh2 Re1 |
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| Jun-05-19 | | TheaN: The combo itself isn't really the problem here (though it took me a while to find the move order), the defense 28....Rc1+! is: that's White's reason for 26.h4, as now 29.Kh2! and we have two standoffs with Black to move, yet White wins. Intriguing. |
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| Jun-05-19 | | eblunt: White plays h4 , relieving the bank rank threat, black plays h5 believing he's done the same but it's an illusion; because of the bishop, h5 doesn't help at all. Black ends up missing more than just an angel, he loses a king |
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| Jun-05-19 | | patzer2: Got the first two moves of today's Wednesday puzzle with 27.
Rxe8+ Qxe8 28. Qxd7 +-.
For my third move (after 28...Qa8), instead of the game move 29. Qc6 +- (forces mate-in-13), I picked 29. Qc7 +- (forces mate-in-11). P.S.: So where did Black go wrong in this Benko Gambit game? I think it starts in the opening with the weak 10...Ne8?. Moving the Knight from a strong square to a weak square with 10...Ne8? goes backward in development, and gives White full compensation for the gambit pawn after 10...Ne8? 11. 0-0 +- (+0.95 @ 32 ply, Stockfish 10). Instead of 10...Ne8?, our Opening Explorer indicates the popular move 10...d6 ⩲ to = has scored well for Black over the board. One notable example of 10...d6 is Black's win in Leko vs V Artemiev, 2015. |
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| Jun-05-19 | | 5hrsolver: Believe it or not I tried 27. Re6 intending 28.Rxg6 and the CG Engine still gives white some advantage! |
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| Jun-05-19 | | King.Arthur.Brazil: I considered immediately the check mate that comes from Q+B looking in a way to put the Q on f6 or e5. But the BN prevent both moves. So, before go on, the good combinations must in general avoid intermediate opponent moves beggining with check. Therefore, fistly 27. Rxe8+ Qxe8 (forced). In my mind, I saw that you cannot retire the Nd7 good position (there's no Rb8??? possibility). Only at this stage, I saw the mate with R+B. Then it turned easy: 28.Qxd7 Qa8 (I have to see black move, to proceed). Obviously: 28... Qxd7?? 29.Rb8+ and Rh8#.
Then I think, that's why I'm writing, that 29.Qd6! is the move, with several threats: 30. Qf6 or Qe5 followed by Qh8# or Qg7#, 30.Rb8+ winnning the Q or forcing the end again with Rh8#. The 30.Qf6 doesn't force the end, since a boring black would play 30... Rc1+ 31.Rx1 (forced) Qxf6 32. Bxf6 33. Rf8 prolonging the game unecessarily. Yes, I'm the chess King killer! (lgs). |
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| Jun-05-19 | | King.Arthur.Brazil: Complementing: for the sequence: 27.Qxd7 Rc1+ 28. Kh2! Re1! 29. Bf6! c4 30.d6 and black is in zugswang. (c3 Bxc3...). The move 29... Kh7 30.Qxe8 Rxe8 31. d6! wins too... Patzer2- I guess that black tried to recover the sacrificed P in a hurry. Therefore, he lose his strong B and his castle became seriously weak and damaged. Also the situation becomes unconfortable because he has no extra time to both capture the P (15... Rxa2?? 16.Rxb8 Rc2 17. Rb1 Nd6 18. Qd1, with a extra piece). The gambit is done on search of development and atack, black is not developed (both N out of play), lose the center control (hadn't done the preventing move d6) and the BQ is exposed to more time lost, since the white B enters in b2-h8 diagonal strongly. I guess that after Qxe2 the artificiality of black moves comes clear. Maybe, 12... c4 was more uneasy or complicated for white, which keep the problems up and gain a tempo for Nd6 and other developments. If you solve the white problems, why did you sacrificied a P? |
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| Jun-05-19 | | whiteshark: <27.Rxe8+ Qxe8 28.Qxd7>, and that's it. |
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| Jun-05-19 | | saturn2: I took 27. Re7 |
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| Jun-05-19 | | TheaN: <King.Arthur.Brazil: Complementing: for the sequence: 27.Qxd7 Rc1+ 28. Kh2! Re1! 29. Bf6! c4 30.d6 and black is in zugswang. (c3 Bxc3...). The move 29... Kh7 30.Qxe8 Rxe8 31. d6! wins too...> Woah, there's something as going too far... <27.Qxd7 Rc1+ 28. Kh2! Re1! 29. Bf6!> definitely deserves a ! from the surprise value <29....Qxd7 -+>. It works better after trading Queens: 29.Qxe8 Rxe8 30.Bf6 +- and Black has no way to protect against the d-pawn's advance. |
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| Jun-05-19 | | Patriot: <<agb2002>: The text 27.Rxe8+ Qxe8 28.Qxd7 is far stronger than 27.Qf4, which is also winning.> Yep! I wondered why you didn't have 27.Qf4 Rxe1+ 28.Rxe1 Qf8 as a direct defense? It doesn't work but it stops 29.Qh6 right away. I never considered 27.Qf4 which is a great candidate! But it was on my radar to take advantage of the Ba1 and so I finally came to rest on 27.Rxe8+ Qxe8 28.Qxd7! seeing the deflection 28...Qxd7?? 29.Rb8+ and mate in a few moves. |
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| Jun-06-19 | | NBZ: <Patriot>: I guess your idea for refuting the Qf8 defence is simply Qa4 forking rook and knight? (i.e. 27. Qf4 Rxe1+ 28. Rxe1 Qf8 29. Qa4) |
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| Jun-06-19 | | Patriot: <NBZ> Yes but my point is that is a direct attempt at stopping the Qh6 threat...not that it doesn't work. It's a candidate. |
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| Jun-06-19 | | agb2002: <Patriot: ...
I wondered why you didn't have 27.Qf4 Rxe1+ 28.Rxe1 Qf8 as a direct defense? It doesn't work but it stops 29.Qh6 right away.>The easy answer is that I'm still snoring when I approach the daily puzzle. This might explain why I failed to see the importance of the open b-file. The not so easy answer has to do with my routine: solving first and writing later often has the problem of forgetting some lines/details. In this case, I did see 28... Qf8, which is decisively met with the very simple 29.Qa4 as mentioned by <NBZ>, but remained in a parallel universe, or something. <I never considered 27.Qf4 which is a great candidate!> Curiously, I never considered 27.Rxe8+ Qxe8 28.Qxd7. I saw 27.Qf4 quickly and didn't bother to look for a better alternative. I should fix this old bad habit. |
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| Jun-06-19 | | Patriot: <agb2002> <Curiously, I never considered 27.Rxe8+ Qxe8 28.Qxd7. I saw 27.Qf4 quickly and didn't bother to look for a better alternative. I should fix this old bad habit.> "Look wide before you look deep." That's the advice my instructor would give me. But you're a damn good analyst! Especially if you went into that half asleep!! :-) |
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| Jun-07-19 | | agb2002: <Patriot: ... "Look wide before you look deep." That's the advice my instructor would give me. But you're a damn good analyst! Especially if you went into that half asleep!! :-) > Thank you! Actually, CG's puzzle is my first 'coffee' every morning and it's particularly effective each time I make an embarrassing blunder or even perpetrate an illegal move! |
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