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Nigel Short vs Erik Blomqvist
Sigeman & Co (2017), Malmo SWE, rd 1, May-10
Spanish Game: Closed Variations. Flohr System (C92)  ·  1-0
ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Jan-02-18
Premium Chessgames Member
  Penguincw: Ah, Tuesday puzzle. 2/2 this week and year now.

Queen sac on Tuesdays though...

Jan-02-18
Premium Chessgames Member
  patzer2: Today's Tuesday puzzle solution 36. Qg7+! is the second move of a mate-in-five combination starting with 35. Qg4+.

For a Black improvement in this Ruy Lopez opening, our Opening Explorer indicates Black has had more success with the computer choice 14...h6 = to ⩱.

Jan-02-18  Skewbrow: I'm afraid my inelegantly wired brain told me to go with a direct Rb8 to pin the bishop. Black has a few spite checks (Qh1, Rc3,...) but I didn't see them leading anywhere. Did I miss a defence?
Jan-02-18  morfishine: <36.Qg7+> forces Black's DSB off the back rank allowing the rook mate

*****

Jan-02-18  Sularus: 36. Qg7+ BxQ
37. Rb8+ Rc8
38. RxR+ Bf8
39. RxB++
Jan-02-18
Premium Chessgames Member
  agb2002: White has a knight for a bishop and a pawn.

The quickest way to win is 36.Qg7+ Bxg7 37.Rb8+ and mate in two.

Jan-02-18
Premium Chessgames Member
  Once: One interesting thing about this puzzle is that it has five possible mating solutions, each exploiting a different weakness in the black position.

The clearest and best is Short's 36. Qg7+, exploiting the fact that the black back rank is weak. It's mate in 4.

Next comes 36. Ne7 threatening Qg8#, relying on the weakness of the g8 square (plus the aforementioned weak back rank). It's mate in 7.

Then we have the slow but deadly 36. Rb8, pinning the weak Bf8 which can't be protected by another piece. It's mate in 8 (after all the spite checks have run out).

In fourth spot is the cunning 36. Nh6 with a double attack threatening both Nxf7# and Qg8#. 36...Bxh6 falls to the familiar back rank weakness after 37. Rb8+. It's mate in 9.

And finally we have the torturer's delight with 36. Qh4 targeting the weak black f6 pawn. Mate in 14.

The problem with the longer mating lines is that they are ... well ... longer. There's always the danger that one of those lines might contain a saving resource for black. That's why Short's line is the best as it needs less calculation.

Jan-02-18  cocker: 36 Ne7 also works, and is slightly quicker than 36 Nh6 or 36 Rb8.
Jan-02-18
Premium Chessgames Member
  agb2002: <Skewbrow: I'm afraid my inelegantly wired brain told me to go with a direct Rb8 to pin the bishop. Black has a few spite checks (Qh1, Rc3,...) but I didn't see them leading anywhere. Did I miss a defence?>

It does win: 36.Rb8 Qg1+ 37.Kg3 Rc3+ 38.f3 and Black runs out useful checks.

Jan-02-18  jffun1958: There are two mate patterns:
1. If the 8th rank were free then Rb8.
2. If g7 were unprotected then Qg7.

Thus:
36. Qxg7+ Bxb7 (forced) 37. Rb7+ ... and mate can only be deferred.

Jan-02-18
Premium Chessgames Member
  malt: 36.Qg7+ B:g7 37.Rb8+ Rc8 38.R:c8+ Bf8
39.R:f8#
Jan-02-18  WorstPlayerEver: The shortest way to the win is 36. Qg3 Qg1x
Jan-02-18  Ratt Boy: <Once: …The clearest and best is Short's 36. Qg7+, exploiting the fact that the black back rank is weak. It's mate in 4.

I was thinking it's mate in 3. Mist the …Rc8 interposition.

Jan-02-18  raju17: This is Monday
Jan-02-18  saturn2: Check, check, checkmate
Jan-02-18
Premium Chessgames Member
  OhioChessFan: I found 2 winners, Rc8 and Nh6, immediately- but not the game continuation.
Jan-02-18  Cheapo by the Dozen: Wouldn't it be nice to get the bishop out of the way ... what if we pin it ... wait, that isn't even necessary!
Jan-02-18  QueenMe: OhioChessFan: You meant Rb8, right?
Jan-02-18
Premium Chessgames Member
  TheAlchemist: It's Short, shouldn't it be Kg3-h4-h5 etc.
Jan-02-18
Premium Chessgames Member
  ajk68: Went with Rb8...didn't compute how long the spite checks and piece sacrifices lasted.
Jan-02-18  NBZ: <WorstPlayerEver>: I think you'll find that 36. g3 Qg1# is ever so slightly shorter. The g-pawn is lighter than the black queen and so can move a little more quickly to g3.
Jan-02-18  WorstPlayerEver: <NBZ> I concur.
Jan-02-18
Premium Chessgames Member
  patzer2: Instead of 18...Qc7 allowing 19. dxc6 Qxc6 20. axb5 ⩲ (+0.42 @ 29 ply, Stockfish 8), Black can keep it evel with 18...cxd5 19. Nxd5 Bxd5 20. exd5 Qc7 21. Bb3 Reb8 = (+0.08 @ 30 ply, Stockfish 8).
Jan-02-18  chesst: a...ll the beuty of the fruit forbidden...
Jan-02-18  chesst: a...ll the beuty of
the fruit forbidden
...
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