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Reynaldo Vera Gonzalez-Quevedo vs Manuel Leon Hoyos
27th Cappelle-la-Grande (2011), Cappelle la Grande FRA, rd 4, Feb-28
Zukertort Opening: Kingside Fianchetto (A04)  ·  0-1



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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Jun-04-15  morfishine: Black Knight covers <e2> so the attack starts with <34...Rxf1+> forcing 35.Kxf1 Bh3+ 36.Kg1 Qc6 or 36.Kf2 Qf7+
Jun-04-15  Moszkowski012273: Good lord... A whole bunch of stuff wins here...
Jun-04-15  zb2cr: I found the game line, fairly quickly.
Jun-04-15  awfulhangover: I solved this very quickly, took me far less time than Tuesday' puzzle. Strange.
Jun-04-15  CHESSTTCAMPS: White is up a pawn, but black's pieces have far more mobility, with long-range striking power that the white pieces do not. White's light-squared bishop is about the only piece defending the king position. Eliminating it allows a decisive invasion on the light squares:

34... Rxf1+ 35.Kxf1 (Kg2 Qc6+ 36.Kxf1 Qh1+ 37.Kf2 Qxh2+ 38.Kf3 [Kf1 Bh3#] Qe2#) Bh3+ 36.Kg1 (Kf2 Qf7+ 37.Kg1 Qf1#) Qc6 and 37... Qg2# can only be avoided by spite check (Qa8|c8+) or 37.Ne3 Bxe3#

Time for review...

Jun-04-15  morfishine: <houtenton> Excellent advice defining pattern recognition
Premium Chessgames Member
  Penguincw: After solving a puzzle for the first time in 2 weeks yesterday, I also got this one (probably the first time in ages I got a Thursday).

I found 34...Rxf1+ 35.Kxf1 Bh3+ 36.Kg1 Ne2+ 37.Kf2 Qf7+ 38.Kxe2 Qf1+. That was as far as my brain could imagine.

Jun-04-15  dfcx: Looks like a mate

A) 35.Kxf1 Bh3+

A1) 36.Kg1 Ne2+ 37.Kf2 (Kh1 Qc6#) Qf7+ 38.Kxe2 Qf1+ 39.Kd1 Bg4#

A2) 36.Kf2 Qf7+ 37.Kg1 Qf1#

B) 35.Kg2 Qc6+ 36.Kxf1 Bh3+ 37.Kg1/Kf2 Qg2#

Jun-04-15  Tiggler: <rebjorn: I saw
34. Bh3 Bxh3 35. Ne2+ and the queen gives mate
34. ..Bd3 35. Qc6 36. Ne3 Bxe3+ 37. Bf2 Bxf2#>

You interchanged black and white moves. I also chose 34. ..Bh3, which wins, but I overlooked the defense 35. Bf2 which seems to be best (-M21).

The game continuation is clearly best (-M6)

Jun-04-15  mel gibson: I didn't think there was a mate but I did see that white's Queen was trapped with:

.... Bc8 (queen check )
Qa8 Bb7
Qxf8+ KxQ

It's hard to know if the puzzle is to solve for mate or gain the most powerful piece.

Premium Chessgames Member
  whiteshark: It’s deja vu all over again.
Jun-04-15  Mating Net: The White pawn on g3, creating the weak point on g2, was the pattern that called for the elimination of the White LSB. That's what made the first move so inviting. Black had plenty of good followup options besides the text moves as many kibitzers have pointed out.
Premium Chessgames Member
  Fusilli: Against 36.Kg1 I saw Qc6, which mates faster, doesn't it? (Or white drops the queen and then gets mated.)
Premium Chessgames Member
  AvidChessMan: I got as far as 34. Qa6 Rf1 35. Kf1 Bh3 36. Kg1 Ne2 37. Kf2 Qf7 but could not see beyond that. I didn’t really notice black’s well placed bishop at h6. White’s king if forced to d1 and the black queen finishes him off at f3. A good rook sac by black.
Premium Chessgames Member
  Bubo bubo: Black is down a pawn, but his pieces are by far more active than there white counterparts, allowing him to start a decisive attack with 34...Rxf1+.

White has to capture because of

A) 35.Kg2 Qc6+ 36.Kxf1 Bh3+ 37.K~ Qg2#

Therefore B) 35.Kxf1 Bh3+, and now

B1) 36.Kf2 Qf7+ 37.Kg1 Qf1# or

B2) 36.Kg1 Qc6!, and White can stop Qg2# only at his queen's expense (37.Qc8+)

A rather easy Thursday, but I am delighted by the contrast between the superb teamwork of the black pieces (even the knight and the DSB, which do not move at all, do a good job by covering e2 resp. e3), and the miserable performance of the white pieces which loiter uselessly on the rim (here the knight and the DSB do even worse, hampering their teammates by blocking the second row resp. e1) !

Premium Chessgames Member
  kevin86: The black knight is trapped and the exchange sac brings the beleaguered horse into the fray. Mate will follow soon.
Premium Chessgames Member
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Jun-04-15  BOSTER: < Fusilli: I saw Qc6 >. Some pieces, like some people, do have principles.
Jun-04-15  Jamboree: Doesn't 34. ... Bh3!! win even faster than the line played in the game?

It's mate in 3 or 4 in almost all lines after Bh3.

If white tries 35. Bxh3 or 35. Bg2, then there are various fatal mating lines all starting with 35. ... Ne2+.

The only way I can see to stave off immediate mate is the variation

34. ... Bh3!!
35. c5 Rxf1+

...and black mops up all of white's pieces and mates a few moves later anyway.

What am I missing?

Jun-04-15  BOSTER: < Jamboree: ...34.Bh3!! >.


Jun-04-15  Tiggler: <BOSTER: < Jamboree: ...34.Bh3!! >.


35. .. Bxf1 36. Rxc1 (36. Ne1 Qf7 -M9 37. Rb2 Bh3 38. c5 Be3 -M7) 36. .. Bxc1 37. Kxf1 (37. Qb5 37. .. Rxf2 -M12 38. Qd5+ Qf7 -M11 39. Qxf7+ Rxf7 40. h4 Bd3 -M9 41. Ne1 Rf1+ 42. Kg2 Rxe1 -M7) (37. Ne1 37. .. Qf7 -M6) (37. h4 Qc6 38. Ne1 Qe4 -M9) 37. .. Qf7 38. Qxb6 Qxc4+ 39. Kg2 (39. Kg1 Qxc2 -M15 40. Kg2 (40. Qa7 Bb2 -M9) 40. .. Qe4+ 41. Kh3 (41. Kg1 Bb2 -M13) 41. .. Qf5+ 42. Kg2 e4 -M12

Jun-04-15  rebjorn: Yep that's what I missed, thanks Tiggler
Jun-04-15  Jamboree: BOSTER and Tiggler:

Ah, OK, interpreting all the complicated lines given after Bf2, what everyone seems to be saying is that yes, 34. ...Bh3 does indeed win as well, but with best defense, white can actually last LONGER in that line than in the line from the game. Right?

As long as Bh3 still wins (which it seems to, even with perfect computer defense), then I'm happy!

Premium Chessgames Member
  Let The Wookiee Win: Stockfish confirms that 34....Qc6 wins as well. Perhaps this is what black had in mind with 33...Bd7, but he then saw the checkmate with Rxf1.
Jun-05-15  patzer2: Here's my look at some key moves and the Thursday June 4, 2015 puzzle (34...?) with the Opening Explorer (OE) and Deep Fritz 14:

<7. Nc2> According to the OE, this is the second most popular move at Master level.

Most often played is 7. Be2, which develops and avoids the second move of a piece in the opening, as in Van Wely vs Khalifman, 2015.

An interesting alternative is 7. f3 as in White's impressive win in W So vs R Mamedov, 2015.

<11. b3> Creating a self-pin on the Rook with 11. b3 can't be best. Indeed, Black already has the advantage early in the opening after <11...Nc5!> (-0.44 @ 22 depth, Deep Fritz 14)

More often played is 11. Na3 = as in M Vachier-Lagrave vs A Istratescu, 2012.

<29. g3?> This is a critical mistake which sets White on the path to defeat.

Better is 29. Rxe4! = or 29. Re1 =.

<29...Bh6!> This simple retreat looks to be decisive for Black.

<30. Rxf5?> White can put up much more resistance with 30.Re1 but appears to still be lost after 30... Rac8 when play might continue 31. Ne3 Bxe3 32. Rxe3 Bxc4 33. Bxc4+ Qxc4 34. Qxb6 Qc6 35. Qxc6 Rxc6 36. Bb2 Kg7 37. Ref3 Kg6 38. h3 h5 39. Kg2 h4 40. Rd3 Rf7 41. Re3 Rfc7 42. g4 fxg4 43. hxg4 Rc2 44. Ree2 Rxe2 45. Rxe2 Kg5 46. Kh3 Rf7 47. Re3 Rf2 48. Bxe5 dxe5 (-2.05 @ 26 depth, Deep Fritz 14).

<32. Qxa4?> This makes the win much easier for Black.

Putting up more resistance but still losing to strong play is 32. Re1 Qf7! when play might continue 33. Qxb6 Bd2 34. Bxd2 Nxd2 35. Bg2 Nxc4 36. Qb7 Qf2+ 37. Kh1 Nxa3 38. Qe7 Bf7 39. Qg5+ Kh8 40. Qe3 Bd5 41. Bxd5 Nxc2 42. Qxf2 Rxf2 43. Rb1 Ne3 44. Kg1 Rd2 45. Be6 a3 46. Ra1 Rg2+ 47. Kh1 Rb2 48. b5 Rxb5 49. Kg1 Nc2 50. Rc1 Rb2 51. Rf1 Nd4 (-7.81 @ 20 depth, Deep Fritz 14).

<36...Rxf1+> This solves the Thursday, June 4, 2015 puzzle by forcing mate-in five.

After <35. Kxf1 Bh3+ 36. Kg1 Ne2+ 37. Kf2 Qf7+ 38. Kxe2 Bf1+ 0-1>, White resigns in lieu of 39. Kd1 Qf3#.

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