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Kinga Zakoscielna vs Krzysztof Bulski
Cracovia op A (2008), Krakow, rd 1, Dec-27
Sicilian Defense: Najdorf Variation (B94)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Feb-26-18  Steve.Patzer: I was wondering what if 43....Qb6?
Feb-26-18  cocker: Good start to the week.
Feb-26-18  morfishine: Standard stuff: <44.Rxf8+> followed by mate

*****

Feb-26-18  malt: 44.R:f8+ K:f8 45.Rd8#
Feb-26-18  zb2cr: I'm with <ChessHigherCat> on this one. 44. Rxf8+, Kxf8(forced); 45.Rd8#.
Feb-26-18
Premium Chessgames Member
  patzer2: More interesting than the mate-in-two solution 44. Rxf8+ Kxf8 45. Rd8# solution to today's Monday (44. ?) puzzle is the game itself in which a women's FIDE Master takes down a strong GM.

So where does the GM go wrong playing the Black pieces against the lower rated player? It's not in the opening. Even though Black plays an apparent novelty with 9...Rc8 to = (after 9...Rc8 10. Nd5 = -0.14 @ 30 ply, Stockfish 8), steering away from the computer choice and normal development with the previously played 9...e6 ⩱ (-0.44 @ 32 ply, Stockfish 8 ) as in Black's win in D Lintchevski vs Karjakin, 2005, the game is well played by Black for the first 27 moves.

Black's first significant mistake is 28...Bh6?, allowing the surprisingly strong 29. a3! ± (+0.87 @ 31 ply, Stockfish 8). Instead, 28...Rbc8 29. b3 Bb7 ⩱ (-0.54 @ 33 ply, Stockfish 8) keeps the initiative and the advantage with Black.

One mistake leads to another as 29....Rbc4? allows White to unpin with the practically decisive 30. Nxe4! +- (+2.22 @ 31 ply, Stockfish 8).

Instead of doubling down with 29...Rbc4?, Black should cut his losses and concede the loss of a pawn with 29...Rb7 30.Nxe4 Qxb2+ 31.Qxb2 Rxc1+ 32.Ka2 Rxb2+ 33.Kxb2 Kg7 34.Ng3 Rg1 35.Nh5+ Kf8 36.g3 ± (+1.16 @ 30 ply, Stockfish 8).

Feb-26-18  1.e4effort: Why am I reminded of the old Pat Travers song?
Feb-26-18  Pasker: Solved under a second!
Feb-26-18  mel gibson: Pawns can be powerful in that configuration.
Feb-26-18
Premium Chessgames Member
  Fusilli: This is quite easy and of course Rxf8+ is the way to go, but g7 would also win. It would have been more interesting if the knight on e4 had been a bishop instead, where g7?? would allow a stalemate with Qd1+, so that Rxf8+ would be the only solution.
Feb-26-18
Premium Chessgames Member
  whiteshark: <44.Rxf8+ Kxf8 45.Rd8#> ends the game.
Feb-26-18  WDenayer: Okay, 44.g7+ also wins (indeed, more sadistic), even 44.gxf7+ wins. 44.Ng5 also wins, even 44.Nd2 :- ).
Feb-26-18  dumbgai: The position is comical overkill. White chose the correct way to the fastest win but there are so many other ways that white could have also won. Surprised that black didn’t resign at some point.
Feb-26-18  shakh.i.shekh: If white plays P-g7 and Black plays K-h7, then if White captures Bishop and does not promote to Knight, Black can play Q-d1+ and force stalemate.
Feb-26-18  lzromeu: The longest and sadistic way is:
44. g7 Qxe4+ 45. Rxe4 Kh7 46. Ree8 Be7 47. Rh8#

46ree8 ... zwgzwang to avoid stalemate

Feb-26-18  BOSTER: About a stalemate. If the pos was
like in the next diagram, and white played Rd8 black'd search for stalemate.


click for larger view

Feb-26-18
Premium Chessgames Member
  patzer2: Correction: 28...Rcb8 ⩱ to ∓ improves over 28...Bh6? 29. a3! ±.
Feb-26-18  Geronimo: What do people think about 41.Kb1? Is this the « quiet move » that allows for the fatal combination? Fun Monday puzzle in any case.
Feb-26-18  cormier:


click for larger view

Analysis by Houdini 4

26...h5 27.a3 e3 28.R5d3 Qxf5 29.Qc2 Qe6 30.Rd8+ Rxd8 31.Rxd8+ Bf8 32.Qg2+ Qg6+ 33.Qxg6+ fxg6 34.Re8 h4 35.Rxe3 g5 36.Kc2 Bg7 37.Kd3 Rd4+ 38.Ke2 Kf7 39.Rh3 Ke6 40.Rh1 Kf5 41.Rf1+ Kg4 -+ (-2.90) Depth: 17

26...h5 27.Rg1 Rxc3 28.bxc3 Rxc3 29.Qb2 Rg3 30.Qb8+ Kh7 31.Rxg3 Qa1+ 32.Kc2 Qxa2+ 33.Kd1 Qxd5+ 34.Ke1 Qxf5 35.Qd8 a5 36.Qg5 Qxg5 37.Rxg5 Kh6 38.Rg2 f5 39.Rf2 Kg5 40.Rg2+ Kf6 41.Rh2 a4 42.Ra2 h4 43.Rxa4 Kg5 44.Ra7 Bc3+ 45.Ke2 h3 46.Rh7 Kg4 47.Ke3 Bf6 -+ (-2.77) Depth: 18

26...h5 27.Rc1 h4 28.Qd1 Rb8 29.Ka1 h3 30.Rd6 Qg5 31.f6 Bxf6 32.Rxf6 Qxf6 33.Qg4+ Qg7 34.Qxh3 Rcb4 35.Rc2 Qg1+ 36.Nb1 Qd4 37.Rg2+ Kf8 38.Qh6+ Ke8 39.Qh2 R8b7 40.Rd2 Qf6 41.Qh3 Rb8 42.Nc3 Rd4 43.Rh2 Ke7 -+ (-3.08) Depth: 19

Feb-26-18  cormier:


click for larger view

Analysis by Houdini 4

25...h5 26.cxb4 h4 27.a3 e3 28.Rh1 Kf8 29.Rh3 Rc2 30.Nd4 Rd2 31.Qxe3 Rxd4 32.Rxd4 Qxd4 33.Qxd4 Bxd4 34.Rxh4 Bg7 35.Re4 Re8 36.Rxe8+ Kxe8 37.a4 Ke7 38.Kc2 Kd6 39.b3 Ke5 40.Kd3 Kd5 41.a5 Kc6 42.Kc4 Bf6 43.Kd3 Kb5 -+ (-2.08) Depth: 21

25...h5 26.cxb4 h4 27.a3 h3 28.R5d2 e3 29.Qxe3 Qxf5+ 30.Qd3 Qxd3+ 31.Rxd3 h2 32.Rh3 Rc2 33.Rd8+ Rxd8 34.Kxc2 Be5 35.Ng3 Rd6 36.Nf1 Rf6 37.Nxh2 Rf2+ 38.Kd3 Bxh2 39.b3 Kg7 40.Ke4 Bd6 41.Kd5 Rf6 42.Rh4 Be7 43.Rg4+ Kh6 44.Ke4 Rg6 45.Rf4 Re6+ 46.Kf3 Kg7 47.Rg4+ Rg6 48.Re4 -+ (-2.51) Depth: 22

Feb-26-18  cormier:


click for larger view

Analysis by Houdini 4

25.a3 bxc3 26.Nxc3 Qe7 27.Rg1 Kh8 28.Qb6 R4c6 29.Qb4 Qxb4 30.axb4 Bxc3 31.b5 axb5 32.bxc3 Rxc3 33.f6 Rb3+ 34.Ka2 Rf3 35.Re1 Rxf6 36.Rxe4 Ra8+ 37.Kb2 Rf2+ 38.Kb3 Rf3+ 39.Kb2 Rg8 40.Re2 b4 41.Rd4 b3 42.Rb4 Rgg3 43.Rh2 Kg7 44.Rbh4 f5 45.Rxh7+ Kf6 46.R7h6+ Kg5 47.R6h5+ Kf4 48.Rh8 Ke5 49.Re8+ Kd4 50.Rd2+ Kc4 51.Rc8+ Kb4 52.Rb8+ Kc5 -+ (-1.96) Depth: 24

Feb-27-18  newzild: Of course 44. g7 also wins, but White has to be careful of two stalemate tricks:

44. g7 Qxe4+
45. Rxe4 Kh7
46. gxf8=B!!
Followed by 47. Bg7+ Kh7 48. Rh8#

As half-correctly pointed out by <shakh.i.shekh>, White has to promote to either a knight or bishop after the alternative 44...Kh7, as otherwise Black can force a stalemate with 45...Qd1+.

Feb-27-18
Premium Chessgames Member
  Once: <newzild> Here's the position after 44. g7 Qxe4+ 45. Rxe4 Kh7


click for larger view

It is true that white could now blunder with 46. Rxf8 or 46. gf, both of which are stalemate draws. Instead white could win quickly with an underpromotion to knight or bishop.

But white doesn't need to be so fancy. He is ahead by two rooks to a bishop. Any non-drawing move wins.

I like 46. Rg4 but frankly almost anything works. Carrying on our sadistic theme we could play the quiet 46. Ka1


click for larger view

Now 46...Kg8 allows promotion with check. Moving the bishop to any other square other than 46...Bxg7 allows 47. Rh8# And 46...Bxg7 47. fg leaves white two rooks up with no stalemating tricks.

In other words, white doesn't have to underpromote to bishop or knight. He can sit on his hands for a move as black is more or less in zugzwang.

Feb-27-18  newzild: <once>, True, although an under-promotion on move 46 forces mate in three whereas most alternatives allow our victim a slower death with 46...Bxg7, as you point out yourself.

However, your 46. Rg4 also mates in three.

Feb-27-18
Premium Chessgames Member
  patzer2: <Cormier> Your Houdini 4 analysis shows 26...h5 is winning for Black after 27. a3?, 27. Rg1?, 27. Rc1? and 27. cxb4? and that's true. However, White has a stronger move available, after 26...h5, with 27. Rd8+ = which fully equalizes.

Position after 25...bxc3 26. Nxc3:


click for larger view

26...h5 27.Rd8+ Rxd8 28.Rxd8+ Qxd8 29.Qxc4 Bxc3 30.bxc3 Qd1+ 31.Kb2 Qd2+ 32.Kb3 e3 33.Qc8+ Kg7 34.f6+ Kh6 35.Qh8+ Kg6 36.Qg7+ Kf5 37.Qxf7 e2 38.Qxh5+ Kxf6 39.Qh8+ Kf5 40.Qc8+ Kg5 41.Qg8+ Kf6 42.Qh8+ = (0.00 @ 32 ply, Stockfish 8)

P.S.: A move earlier 25...h5, which can be met by 26. cxb4 = (0.00 @ 30 ply, Stockfish 8), is also apparently only good for equality.

So the game moves 25...bxc3 = and 26...Bf8 = were probably as good as anything Black had available.

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