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Mark Kremer vs Lars Schandorff
DEN-ch int U18 (1982), Soro DEN, rd 5
Sicilian Defense: Chekhover Variation (B53)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Aug-28-15
Premium Chessgames Member
  Penguincw: Darn it! I actually thought I got the puzzle. My first move was 23.Bh6, taking advantage of the pin. However, a bishop move or even g6, and it's all shut down.

I was hoping for 23...Bf8 (is that even the best move) 24.Rxg7+ Kxg7 (is that even a legal move) 25.Qg5+ Kh8 26.Qf6# 1-0 (is that even checkmate). :||||||||||||||||

Aug-28-15
Premium Chessgames Member
  al wazir: I saw the whole combination in seconds, except for 27. e5. I'd like to think I would have found it OTB, but if not there are other ways to win. All uglier.
Aug-28-15
Premium Chessgames Member
  LucB: 27.e5+! Nice! 'gotta remember that motif!
Aug-28-15
Premium Chessgames Member
  CHESSTTCAMPS: White has B+N for the bishop pair. Black's pressure along the semi-open c-file is of little concern because c2 is well-protected, but white's pressure on the semi-open g-file is worth a forced win:

23.Bxe7 Rxe7 24.Rxg7+! Kxg7 (Kh8|f8 25.Rg8+ forces transposition to other lines) 25.Rg1+ and now

A) 25... Kf8 26.Qh6+ Ke8 27.Rg8#

B) 25... Kh8 26.Qh6 Rg5 (Qxd4|f6|f5 27.Qf8#) 27.Qf8+ Rg8 28.Qxg8#

B.1 26... Re8 27.Qg7#

C) 25... Kf6 26.Qf4+ Rf5 27.e5+! de 28.Qh6#

D) 25... Rg5 26.Qxg5+ K-moves 27.Qg8#

Time for review...

Aug-28-15
Premium Chessgames Member
  CHESSTTCAMPS: <LucB: 27.e5+! Nice! 'gotta remember that motif!> Yes, 28.Qh6# is way cool (both h5 and Rg1 unneeded in the checkmate position).
Aug-28-15
Premium Chessgames Member
  patzer2: The clearance move 23. Bxe7! forces 23...Rxe7 which allows 24. Rxg7+! with a mating attack to solve today's Friday puzzle.

Black's decisive error is 22...Rc5?? Instead, 22...Qc5 23. Bxe7 Rxe7 24. Nb3 (+0.78 2 23 depth) makes a fight of it.

Earlier Black can fully equalize with 20...h6 21. Be3 Nh7 = (instead of 20...a5?).

Aug-28-15  Moonwalker: So close yet so far! Nice finish..
Aug-28-15
Premium Chessgames Member
  gofer: Easier than yesterday...

<23 Bxe7 Rxe7>
<24 Rxg7+! ...>

24 ... Kh8 25 Qh6 mating

24 ... Kf8 25 Qh6 mating

<24 ... Kxg7>
<25 Rg1+ ...>

25 ... Kh8 26 Qh6 mating

25 ... Kf8 26 Qh6+ mating

25 ... Rg5 26 Qxg5+ mating

<25 ... Kf6>
<26 Qf4+ Rf5>
<27 e5+ dxe5>
<28 Qh6#>

~~~

Yep...

Aug-28-15
Premium Chessgames Member
  agb2002: White has a bishop and a knight for the two bishops.

The white bishop blocks the way of the queen and the rooks to g7 and can eliminate the best defender of the black castle at once. This leads to consider 23.Bxe7:

A) 23... Rxe7 24.Rxg7+

A.1) 24... Kxg7 25.Rg1+

A.1.a) 25... Kf6 26.Qf4+ Rf5 27.e5+ dxe5 28.Qh6#.

A.1.b) 25... Kf8 26.Qh6+ Ke8 27.Rg8#.

A.1.c) 25... Kh8 26.Qg2(h6) wins.

A.1.d) 25... Rg5 26.Qxg5+ and mate next.

A.2) 24... Kf(h)8 25.Rg8+ Kxg8 26.Rg1+ transposes to A.1.

B) 23... e5 24.Rxg7+

B.1) 24... Kxg7 25.Qg5+ Kh8 26.Bf6#.

B.2) 24... Kh8 25.Bf6 or 25.Qh6 and mate is imminent.

Aug-28-15
Premium Chessgames Member
  morfishine: It's cool how the Black King suffers the same theme, trapped by his own rook, whether he goes to the back rank or comes out
Aug-28-15
Premium Chessgames Member
  Oxspawn: The first time I have almost got there on a Friday - but I did not find 27. e5
Got lost after
27. Qh6+ Ke5
28. Qg7+ Rf6
......
Not using a board so can't see the options any further. I feel like White is still on a winning trail.
Aug-28-15  wooden nickel: The "funnest" part is picking the right check in the follow-up 26.Qf4+ or Qh6+ or just e5+


click for larger view

they all win, however the played line 26.Qf4 Rf5 27.e5! tops it all.

Aug-28-15
Premium Chessgames Member
  whiteshark: <28.Qh6#> Worth a diagram


click for larger view

(note: ♘d4 and ♖g1 are not neccessary to give mate in the position)

Aug-28-15  saturn2: My first idea was win the rook by 24 Qg5, double attacking g7 and Re7 (f6 does not help). BUT alas, there is a black rock on the 5th rank. So I checked the sacrifice 24Rxg7 and it worked. I also decided that 25 Rg1+ is better than 25 Qg2+. 27e5+ is nice of course, but I think 27exRf5 also works. Full point this friday.
Aug-28-15  wooden nickel: <whiteshark: <28.Qh6#> Worth a diagram> Yeah, looks like an epaulette mate with a wrinkle!
Aug-28-15  paavoh: Great final move. Bxe7, followed by Rxg7+ was easy to see. Then it took quite a bit of time to finish it up.
Aug-28-15  dfcx: Black's king side looks weak. White can attack but also needs to guard its own back rank.

23.Bxe7 Rxe7
24.Rxg7+ Kxg7 (Kf8/Kh8 25.Qh6 mates)
25.Rg1+

A. 25...Kh8 26.Qh6 Qxc2+ 27.Ka1 Qc1+ (f6 28.Qf8#) 28.Rxc1 Rxc1+ 29. Qxc1

B. 25...Kf8 26.Qh6+ Ke8 27.Rg8#

C. 25...Kf6 26.Qf4+ Rf5 27.e5+ dxe5 28.Qh6# -- what a beauty, white had three choices for check at move 26 and ends up using all three for mate.

Aug-28-15
Premium Chessgames Member
  thegoodanarchist: after 27...dxe5, White has something akin to an epaulet mate with 28.Qh6#

An epaulet mate is typically formed with the king on his first rank, and his rooks one either side.

Here instead the usual constraint, the edge of the board, is replaced with Black pieces lined up on the e-file.

In fact, five of Black's chess men form a sort of <cup> into which the Black king has fallen. Maybe it should be called a "cup mate"

Aug-28-15
Premium Chessgames Member
  offramp: Superb. I didn't see it at all.

Black ends up in a version of the Good Anarchist mate (q.v.).

Aug-28-15  M.Hassan: "Difficult"
White to play 23.?
Equal

23.Bxe7 Rxe7
Back rank becomes undefended
24.Rxg7+ Kxg7
25.Rg1+ Kh8
26.Qh6 threatening mate on g7/f8

A) 26........Qxd4
27.Qf8#

B) 26.........Rg5
27.Qxg5
B1) 27......Re8
28.Qg7#
B2) 27.......Qxd4
28.Qf8#
=============
25.........Kf6 did not occur to me

Aug-28-15  dark.horse: Love 27.e5+!! The square needed covering, no white piece can do it, so force a black piece to occupy e5.
Aug-28-15
Premium Chessgames Member
  gawain: Oh, I see! The Black king is going to be trapped in the middle of the board, with the connivance of his own pieces.

Nice.

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