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Simon Kim Williams vs David Guthrie
4NCL 2016/2017 (2017), Reading ENG, rd 7, Mar-04
Sicilian Defense: General (B20)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
Aug-31-18
Premium Chessgames Member
  al wazir: The first two moves are easy. The rest of the combo, not so easy.
Aug-31-18  TeaChess: Got the first two moves. Chose 27. Ne6 instead.
Aug-31-18  Mayankk: Got distracted by 25 Rxf7+ to open up Ne6 fork possibilities. Should the king move then 26 Rxh6 probably but the Ne6 threat is now gone...

Never realised that I should have swapped my first two moves.

Aug-31-18
Premium Chessgames Member
  OrangeTulip: Got the first 2 moves as well, hoorray!
Aug-31-18  greenfield67: I did the whole thing without Rxf7 and ...Rh8. I think it works too, although at some stage Black gets to go back to the 7th rank and you need a rook lift.
Aug-31-18
Premium Chessgames Member
  agb2002: White has a pawn for a knight.

The f-pawn prevents Ne6+. This suggests 25.Rxh6 and 25.Rxf7+.

In the case of 25.Rxh6 Kxh6 (else drop a pawn) 26.Rxf7:

A) 26... Rh8 27.Ne6

A.1) 27... Qd7(e8) 28.Qh3+ Nh4 29.Qxh4+ Kg6 30.Qh7#.

A.2) 27... Rxf7 28.Qh3+ Nh4 29.Qxh4+ Kg6 30.d4+ Rf5 (30... Nf5 31.Nxd8 wins decisive material -31... Rxd8 32.Qxd8-) 31.Nxd8 wins decisive material.

B) 26... Rxf7 27.Nxf7+ Kg7 28.Nxd8 Rxd8 29.Qc7 wins decisive material.

C) 26... Nh8 27.Qh4+ Kg6 28.d4+ Nf5 29.Bxf5#.

-----

In the case of 25.Rxf7+:

A) 25... Rxf7 26.Ne6+

A.1) 26... Kh7 27.Rxh6+

A.1.a) 27... Kxh6 28.Qh3+ Nh4 29.Qxh4+ Kg6 30.d4+ Rf5 (30... Nf5 31.Nxd8 wins decisive material -31... Rxd8 32.Qxd8-) 31.Nxd8 wins decisive material.

A.1.b) 27... Kg8 28.Rxg6+

A.1.b.i) 28... Nxg6 29.Qxg6+ Kh8 30.Nxd8 wins decisive material.

A.1.b.ii) 28... Kh7 29.Rg7+ and mate next.

A.1.b.iii) 28... Kh8 29.Qh4+ Rh7 30.Qf6+ Rg7 31.Qxg7#.

A.2) 26... Kh8 27.Rxh6+ Rh7 (27... Kg8 28.Rxg6+ transposes to A.1.b) 28.Rxh7+ Kxh7 29.Nxd8 Rxd8 30.Qc7 wins decisive material.

A.3) 26... Kg8 27.Nxd8 Rxd8 28.Rxh6 + - [Q+B+2P vs r+2n].

B) 25... Kg8 26.Rh7

B.1) 26... Bxg5 27.Qxg5

B.1.a) 27... Rf7 28.Rh8+ Kg7 29.R5h7#.

B.1.b) 27... d4 28.Qh6 Rf7 (28... Nf5 29.Qxg6+ Ng7 30.Qxg7#) 29.Rh8+ Nxh8 30.Qxh8#.

B.1.c) 27... Qe8 28.d4 Rc6 looks unnecessarily complex.

B.2) 26... Kg7 27.Rxg7+ Kxg7 28.Ne6+ wins decisive material.

-----

I think I'd play 25.Rxh6.

Aug-31-18  Walter Glattke: 25.Rxh6 Kxh6 27.Rxf7
A) 27.-Nf5 28.Rh7#
B) 27.-Rxf7 28.Nxf7+ Kg7 28.Nxd8 decisive material

C) 27.-Nf4 28.Qxf4 Qc7!? 29.Ne6+ Kg6 30.d4+ Kh5 31.Rh7#

C2) 28.-Qd8 29.Qh3+ Kg6 30.d4+ Nf5 31.Qh7+ Kxg5 32.Qxf5+ Kh4/h6 33.Rh7#

Aug-31-18  SpamIAm: I'm liking white's whole strategy to the game, particularly 2.Be2 and 11.Bd1. It's almost a Dada-like approach, a Grand Prix Attack with a passive bishop. In hindsight, black's taking a traditional Dragon formation seems to play into white's hands too much.
Aug-31-18  malt: Have 25.R:h6 K:h6 26.R:f7!
(26...R:f7 27.N:f7+ )
26...Rh8 27.Ne6 Nf5 28.R:f5 Qh4 (..Qe7)
29.Qe3+ Nf4 (29...Kh7 30.Rf7+ Kg8 31.Rg7# )

30.R:f4

Aug-31-18
Premium Chessgames Member
  patzer2: For today's Friday puzzle, I found the initial move 25. Rxh6! easy enough. However, after 25...Kxh6 I went for 27. Nxf7+ Rxf7 28. Rxf7 +- (+3.83 @ 31 ply, Stockfish 9) for my second move.

After seeing the stronger second move 27. Rxf7! +- (+7.47 @ 27 ply, Stockfish 9) and Black's reply 27...Rh8, I picked 27. Ne6 +- (mate-in-22, Stockfish 9) for the third move. Of course the game continuation 27. Qh3+ +- (mate-in-five, Stockfish 9) is the more efficient route to mate.

So where did Black's game start to go bad? The culprit appears to be 13...Nd7?! 14. Qg3 ± (+0.85 @ 27 ply, Stockfish 9) 14...Kh7?, allowing 15. c3 Nc6 16. f5! ± (+1.38 @ 27 ply, Stockfish 9).

Instead, 13...d5 14. c3 Nc6 = (+0.10 @ 32 ply, Stockfish 9) would have kept the game about level, and 14...d5 15. c3 Nc6 ⩲ (+0.45 @ 31 ply, Stockfish 9) would have put up much more resistance.

Aug-31-18  mel gibson: I didn't see that - I must be too tired after a long week.

Stockfish 9 says

25. Rxh6

(25. Rxh6
(♖h5xh6 ♔g7xh6 ♖f1xf7 ♖f8xf7 ♘g5xf7+ ♔h6-g7 ♘f7xd8 ♖c8xd8 d3-d4 ♖d8-f8 d4xc5 ♖f8-f6 ♕g3-c7 ♔g7-f7 ♕c7xb7 ♘g6-f4 h2-h4 ♘f4-e6 b2-b4 ♖f6-h6 g2-g3 ♖h6-f6 ♔g1-g2 a7-a5 ♗c2-d1 ♖f6-g6 ♔g2-h2 ♖g6-h6 ♕b7-d7 a5-a4 ♗d1-g4 ♘e6-f8 ♕d7-a7 ♘f8-h7 b4-b5 d5-d4 b5-b6 d4xc3 b6-b7 c3-c2 b7-b8♕ c2-c1♕) +8.32/34 111)

score for White +8.32 depth 34

Aug-31-18
Premium Chessgames Member
  MDKnight: The immediate 26. Qh3 Kg5 27. Qe3 works quicker.
Aug-31-18  Simuyi: 27.♘e6 clearly wins the game for white.
Aug-31-18  cormier: patzer2:

Instead, 13...d5 14. c3 Nc6 = (+0.10 32 ply, Stockfish 9) would have kept the game about level

Aug-31-18  landshark: <MDKnight> I chose 26. Qh3 too - to which -Nh4 puts up more of a fight: 27.Qxh4+ Kgg6 and I erred with 28.d4+ not seeing -f5 which saves Black. Better is what I found analyzing: 28. Qh7+ Kxg5 29. h4+ Kg4 30. Bd1+ Kg3 31. Rf3+ Kg4 32. Rxf7+ Kg3 33. Qg7+ Kxh4 34. Qh6+ Kg3 35. Qf4#. These all seem forced to me - I think 26.Qh3 is a viable way to go -

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