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Zaida Hernandez vs Biljana N Dekic
Dresden Olympiad (Women) (2008), Dresden GER, rd 7, Nov-20
Sicilian Defense: Scheveningen. Classical Variation (B84)  ·  1-0



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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
May-24-18  Patriot: Nevermind...38...Qe1+ 39.Rxe1 is "good enough".
May-24-18  stacase: I parted company at 43.a5. I would have gotten White's Bishop in on the party with 43.Bd5+.

You have to see that with 36.Rxe7+ White will win back the Rook in a few moves and then it's a King chase.

May-24-18  Walter Glattke: 42.a5 without check in the match is bad played: I think for mating by 42.Bd5+ Kc7 43.Qa7+ Kd6 44.Qd7+ or now 44.-Ke5 45.Qc7+ Kxd5 46.Qxg3 (44.-Kc5 45.Qc6#) or 42.-Kb8 43.Qb6+ Kc8 44.Qb7+ Kd8 45.Qd7# or 42.-Kc8 43.Qh8+ Kc7 44.Qg7 with similar ends, mate or Qxg3.
May-24-18  agb2002: White has a rook for a knight.

Black threatens Qh4+ and Bc5+.

The black bishop seems to be the best defender of the king. Therefore, 36.Rxe7+:

A) 36... Nxe7 37.Qh8+

A.1) 37... Rf8 38.Rd8+ Kxd8 39.Qxf8+ Kc7 40.Qxe7+

A.1.a) 40... Kc6(8) 41.Qd7+ followed by Qd2 + - [B].

A.1.b) 40... Kb6(8) 41.Qd8+ followed by Qd2, as above.

A.2) 37... Ng8 38.Qxg8+ Rf8 (38... Ke7 39.Qd8#) 39.Rd8+ Kxd8 (39... Ke7 40.Qxf8#) 40.Qxf8+ Kc7 41.Qc5+

A.2.a) 41... Kb7 42.Bd5+ Kb8 43.Qb6+ Kc8 44.Qb7+ Kd8 45.Qd7#.

A.2.b) 41... Kb8 42.Qb6+ Kc8 (42... Ka8 43.Bd5#) 43.Qxa6+ followed by the return of the queen to avoid perpetual.

A.2.c) 41... Kd8 42.Qd4+ as in A.1.a.

B) 36... Kxe7 37.Qg7+ Ke8 38.Qxf6 + - [R+B vs n].

May-24-18  abuzic: 36.Rxe7+ Nxe7 37.Qg7 Rf8 38.Qf7+! Rxf7 39.exf7+ Kf8 40.Rd8+ Kg7 41.f8Q+ Kh7 42.Qh8#.
May-24-18  Walter Glattke: 43.a5, all moves above one number more, I apologize.
May-24-18  AlicesKnight: I found the main game line fairly readily; the second R sacrifice was key, decoying a Black piece, as with J Mason vs Winawer, 1882
May-24-18  gofer: Knights are lousy at defending these sorts of positions and Rf6 is almost completely out of the game, so we just need to work on Be7. But during that I see the "classic" rook sacrifice winning R+N without loss of tempo! Our king looks a little defenceless, but we can probably track back to avoid the stalemate.

<36 Rxe7+ ...>

36 ... Kxe7?
37 Qg7+ Ke8
38 Qxf6 +-

<36 ... Nxe7>

<37 Qh8+ Rf8>

<38 Rd8+! Kxd8>

<39 Qxf8+ Kc7>

<40 Qxe7+ ...>

Okay, this is probably it. The white queen needs to get to d4 to cover squares that can give check to a king on h2 (i.e. d6, e5, f4 and h4) and therefore stop any possibility of stalemate.


How many of us can visualise everything after <40 Qxe7+>? I know I was lazy/couldn't. With the position displayed at that point I can see that...

40 ... Kb6 41 a5+ (Kxa5 Qd8+ mating) Kc6 42 Qd7+ Kc5 43 Qd5#

40 ... Kc6 41 Qd7+ Kc5 42 Qd5+ Kb6 43 a5+ (Kxa5 Qd8+ mating) Ka7/Kc7 44 Qd7+ Kb8 (Ka8 Bd5+ mating) 45 Qd8+ mating

So, if we see that, then we see that 40 ... Kb8 41 Qd8+ is the only defence worth looking at and 40 ... Kc8 41 Qd7 Kb8 42 Qd8+ transposes.

40 ... Kc8

41 Qd7 Kb8

42 Qd8+ Ka7 (Kb7 43 Bd5+ Ka7 44 Qd7+ Kb6 45 Qc6+ Ka5 46 b4+! Kxa4 47 Qxa6#)

43 Qd4+ ...

So at least I got that far...

May-24-18  mel gibson: Stockfish 9 says mate in 10:

36. Rxe7+

(36. Rxe7+ (♖d7xe7+
♘c6xe7 ♕h6-g7 ♕g3-h4+ ♔h1-g1 ♖f6xe6 ♗b3xe6 ♕h4-e1+ ♖d1xe1 ♔e8-d8 ♖e1-d1+ ♔d8-c7 ♕g7xe7+ ♔c7-b6 ♕e7-d8+ ♔b6-b7 ♖d1-d7+ ♔b7-c6 ♕d8-c7+)

+M10/67 52)

May-24-18  leRevenant: as per <al wazir> Most unusual for me to get Thursday. I'll quit while I'm ahead and take a month off.
May-24-18  cocker: White had been 5 points up since move 20, and missed Rxf5 on move 32 or 34.
May-24-18  malt: Went for 36.Qh8+ Rf8 37.R:e7+
( As Rd8+ wont work)
(37...K:e7 38.Qg7+ Ke8 39.Qd7# )
38.Rd8+ K:d8 39.Q:f8+ Kc7 40.Q:e7+
Premium Chessgames Member
  takchess: Im with Malts line. Thought that the king could take the sixth rank pawn on the Rxe7 line. Better luck next week hopefully.
May-24-18  Pchief: According to the engine, a more potent threat would be Q check at f7 and then exf7, Rd8+ promoting the pawn.
May-24-18  Walter Glattke: The threatening of Qh4+ and Bc5+ could end with 36.Qg7 Qh5+ 37.Kg1 Bc5+ 38.R7d4 Nxd4 39.Qd7+ Kf8 40.cxd4 Be7 41.axb5 axb5 42.Qxb5, threatening d5-d6 etc., counter threat not strong enough.
Premium Chessgames Member
  catlover: I also went with 36 Qh8+ but in any case it transposes into the game line with 36...Rf8 37 Rxe7 Nxe7 28 Re8+ and so on, because if 36...Bf8 37. QxR.
May-24-18  stacase: I said earlier <I would have gotten White's Bishop in on the party with 43.Bd5+.> Since then I've played around with it, and White's 43.a5 prevents Black's King from dancing away from his pursuers complicating what should be a "Won Game".
May-24-18  Pasker: After this nice tactic white played like an amateur. May be a blitz game but after achieving the material advantage white was not at all trying to checkmate black but playing unnecessary moves. She was probably worried about the perpetual check but I would personally go for a king hunt in this position without much of a thought. There will be a mate for sure and the number of moves to do it doesn't matter.
May-24-18  clma55: What if Qg7? No perpetual
Premium Chessgames Member
  Breunor: Hard to believe, but according to Stockfish, black is lost after d5 on move 11!

1) +5.80 (25 ply) 12.f5 Bc5 13.fxe6 O-O 14.exd7 Nxd7 15.Nxd5 Qxe5 16.Nb3 Bxd5 17.Bxd5 Rad8 18.Bf4 Qe7 19.Na5 Rc8 20.Bb7 Qe6 21.Re1 Qf5 22.Bxc8 Rxc8 23.Nb7 Nf6 24.Nxc5 Qxf4 25.Nxa6

Stockfish recommends 11 ... dxe5:

1) +0.48 (21 ply) 12.fxe5 Be7 13.Bxb7 Qxb7 14.Qg4 Nc6 15.Nxc6 Qxc6 16.Bf4 b4 17.Qxg7 Rf8 18.Ne2 Qxc2 19.Nd4 Qg6 20.Qxg6 hxg6 21.Rac1 Rh8 22.Rc7 Rd8 23.Bg3 Rh5 24.Nf3 Bc5

I'm just shiocked that black is lost after the real move 11

May-24-18  schachfuchs: Is the puzzle solved with my line 36.Rxe7+ Nxe7 37.Qh8+ Rf8 38.Rd8+ Kxd8 39.Qxf8+ Kc7 until 40.Qxe7+ ?
May-24-18  stacase: <Pasker: ...There will be a mate for sure and the number of moves to do it doesn't matter.>

And if you remember that you don't have to say check with the Queen every move you are absolutely right (-:

I've been playing with this thing all morning, and so long as White pays attention to Black's Queen and all of the possible moves, and doesn't blunder, Black is toast.

May-24-18  Walter Glattke: Playing the match, I saw 30.Qh6!?, while
I would play 30.Rxf5 gxf5 31.Qg7+ Kd8/Ke8
32.Bc6+ amd white wins rapidly.
May-24-18  Walter Glattke: After 31.-Ke8, white must play 32.Qh8+ Ke7 33.Qh7+ Ke8 34.Qxh5+ Ke7 35.Qh7+ Ke8 36.Qg8+ Rf8 37.Qg6+ Ke7 38.h4, that wins. 38.-Rh8?? 39.Qf7+ Kd8 40.Bc7+ Qd7 (Nd7 e7#) 41.Rxd7+ Nxd7 42.Qxd7#
May-24-18  cormier: Breunor: Hard to believe, but according to Stockfish, black is lost after 11...d5 .

1) +5.80 (25 ply) 12.f5 Bc5 13.fxe6 O-O 14.exd7 Nxd7 15.Nxd5 Qxe5 16.Nb3 Bxd5 17.Bxd5 Rad8 18.Bf4 Qe7 19.Na5 Rc8 20.Bb7 Qe6 21.Re1 Qf5 22.Bxc8 Rxc8 23.Nb7 Nf6 24.Nxc5 Qxf4 25.Nxa6

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