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Piotr Bobras vs Peter Schreiner
Bundesliga (2016/17), Berlin GER, rd 10, Mar-19
Spanish Game: Closed. Averbakh Variation (C87)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
Mar-23-17
Premium Chessgames Member
  whiteshark: <21. Nxg7!> gets the silicon preference
Nov-02-18
Premium Chessgames Member
  drollere: i got
27. Qc3+ Kg6 [Re5 f4]
28. Qf6+ Kh7
29. Qxh6+ Kg8
30. Nf6+ Kf7
31. Qh7+ Ke6
32. Qxe4+ Kf7
33. Qh7+ Kf8
34. Rxe8+ Qxe8
35. Nxe8
and Re5 produces a different way to exploit the weaknesses of the black K.
Nov-02-18
Premium Chessgames Member
  An Englishman: Good Evening: I found 27.gxh6+,Kxh6; 28.Qf4+,K-any; 29.Re3 and thought it would win out. The interesting lines occur when Black does not recapture the pawn, but they still seemed good for White, except for 27...Kf7, which looked a little unclear. What did I miss this time? Perhaps 27...Kxg6; 28.Qf4+,Kg7; 29.Re3,Qg4!?; 30.Rg3,Qxg3?
Nov-02-18
Premium Chessgames Member
  al wazir: I considered 27. Qc3+, but didn't see it all the way through to a win. (And I bet Bobras didn't either.)
Nov-02-18
Premium Chessgames Member
  Once: Odd puzzle. Fritz prefers the pretty obvious 27. gxh6+, which was also my pick. White opens up the black king and can pick off the Bd1 at his leisure.

27. Rxd1 also seems to give white an advantage.

So we have a puzzle with three possible solutions, one of which is the most obvious check on the board and another is the most obvious recapture on the board.

As I said, an odd puzzle.

Nov-02-18  SpamIAm: <drollere>, in your line with 32.Qxe4+, instead 32.Rxe4# is mate.
Nov-02-18
Premium Chessgames Member
  scormus: I wondered about 27 Qf3+ .... Oh, <al wazir> already wrote it.

OK, I think 27 gxh6+ is so obvious that the reason W played Qf3+ instead was he didn't see it right through OTB, so hedged his bets with the text move.

Nov-02-18  Walter Glattke: I proof 27.gxh6++ a) 27.-Kxh6 28.Qf4+ Kh7 29.Qh4+ wins B) 27.-Kf7 (Kf8,h8,h7 Qg7#) 28.Qf4+ Ke6 29.Qxe4+ Kf7 30.Qh7+ Kf8 31.Qg7#
Nov-02-18  TheaN: Friday 2 November 2018

<27.?>

Not really sure what to think of this one as Once properly posted. Was pretty certain gxh6+ was the best move, as this justifies White going down an exchange (and Black has to wary of the immediate Queen check followed by Re3. No, I didn't calculate a win, but it just looks so much better for White to begin with.

Nov-02-18
Premium Chessgames Member
  patzer2: < Once: Odd puzzle. Fritz prefers the pretty obvious 27. gxh6+, which was also my pick.> I also went with 27. gxh6+ +- (+3.94 @ 23 ply, Stockfish 9) which is apparently stronger than the game continuation after 27. Qc3+ Kh7 ± to +- (+2.08 @ 23 ply, Stockfish 9).

The availability of the stronger defense 27...Kh7 ± to +- (+2.08 @ 23 ply, Stockfish 9) also suggests 27...Re5?, allowing 28. f4 +- (+4.58 @ 20 ply, Stockfish 9), was a mistake.

Though your plan of something like 27. gxh6+ Kxh6 28. Rxd1 ± to +-(+2.15 @ 27 ply, Stockfish 9) is probably winning, the strongest follow-up involved with 27. gxh3+ is much more complicated than leisurely capturing the unprotected Bishop.

Indeed, the Stockfish 9 best play line after 27. gxh3 Kxh3 28. Qf4+ +- (+3.94 @ 23 ply, Stockfish 9 analysis of move 27.?) initiates an attack that ignores the unprotected Bishop.

One instructive line occurs after 27. gxh6+ Kf2, when the Black King declines the pawn capture and allows White a mate-in-six with 28.Qg7+ Ke6 29.c4! Bh5 30.Rxe4+ Kf5 31.f3 Bxf3 32.gxf3 Rxe4 33.Qf6#.

However, from a human perspective, I must admit I see a lot of merit in taking a clear advantage by capturing near decisive material, as opposed to ignoring an obvious material advantage and trying to figure out all the complications of a deep computer generated king pursuit combination.

P.S.: Earlier, Black's game took a big turn for the worse with 17...f5?, potentially allowing 18. Nd5 +- (+2.57 @ 20 ply, Stockfish 9) or the game continuation 18. Nf4 ± to +- (+1,84 @ 19 ply, Stockfish 9).

Instead, 17...Qd8 18. Nf4 Qg5 19. Qxg5 ⩲ (+0.56 @ 21 ply, Stockfish 9) would've given Black a better fighting chance.

In the opening, I prefer the computer choice 12...d5 = (-0.23 @ 21 ply, Stockfish 9) as in the drawn game A H T dos Santos Fier vs K Mekhitarian, 2012.

Nov-02-18
Premium Chessgames Member
  drollere: <in your line with 32.Qxe4+, instead 32.Rxe4# is mate.>

thank you. at that point i could see i would win the Q and one other piece and was completely distracted by the material carnage. too much videogaming, i think.

Nov-02-18
Premium Chessgames Member
  agb2002: White has a knight for a rook and a bishop.

The most forcing move is 27.gxh6+:

A) 27... Kf7 28.Qf4+

A.1) 28... Ke6 29.Qxe4+ Kf7 (29... Kd7 30.Nf6+ Kd8 31.Qxe8#) 30.Qh7+ Kf8 31.Qg7#.

A.2) 28... Kg6 29.Qf6+ Kh5 (29... Kh7 30.Qg7#) 30.Re3

A.2.a) 30... Bg4 31.Nf4#.

A.2.b) 30... Rf8 31.Nf4+ Kg4 32.Rg3#.

A.2.c) 30... Bf3 31.gxf3 exf3 32.Rxf3 Qg4+ (or 32... Re1+) 33.Kh2 seems to win decisive material to stop mate (33... Qh4+ 34.Rh3).

A.3) 28... Kg8 29.Qg5+ and mate in two.

B) 27... Kxh6 28.Qf4+, followed by 29.Re3, looks winning. For example, 28... Kh5 29.Re3 Bg4 30.Nf6+ Kg6 (30... Kh4 31.Rh3#) 31.Nxe8 Qxe8 32.Qxg4+ Kf7 33.Rxe4 Qc8 34.Qf3+, etc.

C) 27... Kf8(h7,h8) 28.Qg7#.

Nov-03-18
Premium Chessgames Member
  patzer2: <agb2002> In response to 27. gxh6+ Kf7, I also calculated the 28. Qf4+ line and saw some but not all of what you found.

However, when I checked 27. gxh6+ Kf7 with the computer, Stockfish 9 found the more efficient mate-in-six 28.Qg7+ Ke6 29.c4! Bh5 30.Rxe4+ Kf5 31.f3 Bxf3 32.gxf3 Rxe4 33.Qf6#.

Nov-04-18
Premium Chessgames Member
  agb2002: <patzer2> Thank you!

I looked at Qg7+ momentarily but didn't find c4.

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