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Bozidar Ivanovic vs Evgenij Ermenkov
EUR-chT (Men) 8th (1983), Plovdiv BUL, rd 2, Jun-25
Sicilian Defense: Modern Variations (B54)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
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Sep-20-13
Premium Chessgames Member
  patzer2: <al wazir> I can't find a win after 26. Rxf7 Bxf7!

White seems forced into a draw by repetion after 26. Rxf7 Bxf7! 27. Qh3+ Kg7 28. Qh7+ Kf6 29. Qxf7+ Ke5 30. Qd5+ Kf6 31. Qf7+ Ke5 32. Qd5+ Kf6 33. Qf7+ =.

Sep-20-13  gofer: The poor old king is trying to defend Pf7 and Ph7 - all on his own! White needs to open up the f file to allow 1 Rxh7+ Kxh7 2 Rxf7+ and then it will be all over. Losing a knight to achieve this is not a problem...

<22 f5! ...>

Black has a couple of responses, but to take the knight seems to be misguided...

22 ...exd5
23 fxg6 ...

23 ... hxg6
24 Rh7+ Kg8
25 Rfxf7 Ne5
26 Rhg7+ Kh8
27 Qh3+ mating

23 ... fxg6
24 Rxh7+ Kxh7
25 Rf7+ Kh8
26 Qh3+ mating

23 ... Nd5
24 Rxh7+ Kf8 (24 Kg8 25 Qh5 mating)
25 Rfxf7+ Nxf7
26 Rxf7+ Kg8
27 Qh3 mating

So black should probably take the pawn...

<22 ... exf5>
<23 exf5 ...>

23 ... Nf6
24 Nxf6 Qxf6
25 fxg6 winning easily

23 ... Bxd5
24 Rxh7+ Kxh7
25 gxf6+ winning

<23 ... Ne5>
<24 f6+ ...>

24 ... Qxf6
25 Nxf6 Nxg4
26 Nxg4 winning

24 ... Kh8
25 Rxh7+ Kxh7+
26 Qh3+/Qh4+ Kg8
27 Qh6 mating

24 ... Kf8
25 Rxh7 mating

<24 ... Kg8>
<25 Qh4 h5>
<26 Qg4 ...>

Hmmm, okay this final line seems quite resistent, but white has a pawn on f6! and black is going to have to give up the rook or knight to stop white from playing Qh6 and Qg7#. So it looks like this is the right approach...

~~~

Yep. But what is black's best defense?

Sep-20-13  Morttuus: I have found 22. f5, that's not very difficult to find. But then I have thought about 22. Nc7 prior, because after 22...Qxc7 the queen is completely out of play (either black loses a rook for a knight). Then I would play 23. f5 and so on.

Or...Does the black have any better answer that 22. Nc7 Qxc7?

Sep-20-13
Premium Chessgames Member
  morfishine: I had 4 candidates to look at: (1) <22.e5> (2) <22.Rxh7+> (3) <22.f5> & (4) <22.Ne3>

Referencing 22.f5, I thought Black could hold after <22.f5 exd5 23.Rxh7+ Kxh7 24.fxg6+ fxg6 25.exd5 Ne5 26.Qh5+ Kg7 27.Bxg6 Nxg6 28.dxc6 Rf8> and Black is safe

Nice puzzle

*****

Sep-20-13  bubuli55: < 22. f5 > obviously the only. If Black continue with < 22... exd5 > as I suspect, White can unload < 23. Rxh7 > game over:)

Play the game

Sep-20-13  bubuli55: < Referencing 22.f5, I thought Black could hold after <22.f5 exd5 23.Rxh7+ Kxh7 24.fxg6+ fxg6 25.exd5 Ne5 26.Qh5+ Kg7 27.Bxg6 Nxg6 28.dxc6 Rf8> and Black is safe >

Try 25. Rf7+ Kh6 26. Qh3+ Kg5 27. Qe3+ and mate follows in 2 moves. So no 25. exd5

Sandals :)

Sep-20-13  mistreaver: Friday. White to play. Difficult. 22?
White has obvious space advantage and attacking chances. But how can he extract anything out of that? The most obvious move is
22 f5!
But is it good enough? Black has some options, but the most challenging seems to be the capture of the piece 22 ... exd5
23 exd5 Bb7
Now white has to prove that his sacrifice was not just a bluff. 24 fxg6 fxg6 (if 24... hxg6 then 25 Rxf7+ might be decisive) 25 Rxh7+ and white probably wins
But black can probably play better
22 f5 exd5
23 exd5 Nf6
24 Qh4 h5
25 dxc6
but here white has just better position with material balance. I think that f5 is just winning here. Time to check and see how the game went, and too see if there is some hidden resource with my computer. ---
I was not very accurate, but the bottom line is that f5 wins.
Sep-20-13  avidfan: 22.f5 exd5 23.Rxh7+ Kxh7 24.fxg6+ fxg6


click for larger view

25. Rf7+ Kh6 26. Qh3+ Kg5 27. Qe3+


click for larger view

27...Kg4 28.Qf4+ Kh5 29.Rh7#

27...Kh5 28.Rh7+ Kg4 29.Qg3#

Sep-20-13
Premium Chessgames Member
  al wazir: <patzer2: I can't find a win after 26. Rxf7 Bxf7!> I seem to have overlooked that ♗.
Sep-20-13
Premium Chessgames Member
  agb2002: The material is identical.

Black threatens 22... exd5.

The first idea that comes to mind is 22.f5 to open lines:

A) 22... exd5 23.Rxh7+

A.1) 23... Kxh7 24.fxg6+

A.1.a) 24... fxg6 25.Rf7+ Kh6 (25... Kh8 26.Qxg6 wins) 26.Qh3+ Kg5 27.Qe3+ and mate in two.

A.1.b) 24... Kg7(8) 25.gxf7+ Kf8 (25... Kh8 26.Rf3 Nf6 27.Rh3+ Nh7 28.Qg6 wins) 26.fxe8=Q+ Kxe8 27.Qg6+ Ke7 28.Qf7#.

A.1.c) 24... Kh8 25.Qh5+ and mate in three.

A.1.d) 24... Kh6 25.Qh3+ Kxg6 (25... Kg5 26.Rf5+ and mate in three; 25... Kg7 26.Qh7+ Kf8 27.Q(R)xf7#) 26.exd5+ and mate soon.

A.2) 23... Kf6 24.fxg6+ Ke5 (24... Ke7 25.R1(h)xf7#) 25.exd5 looks disasterous for Black.

A.3) 23... Kf8 24.fxg6 (24.Rxf7+ also seems to win) 24... Ne5 (24... Re7 25.g7+ wins; 24... f6 25.Rf7+ Kg8 26.Qh5 and mate soon) 25.Rfxf7+ Nxf7 26.Rxf7+ Kg8 27.Qh5 and mate in two.

A.4) 23... Kg8 24.fxg6

A.4.a) 24... Ne5 25.Qh5 f5 (25... fxg6 26.Rh8+ Kg7 27.Qh7#; 25... Nxg6 26.Rfxf7, etc.) 26.Qh6 wins.

A.4.b) 24... f6 25.Qh5 as in A.4.a.

B) 22... Ne5 23.f6+

B.1) 23... Qxf6 24.Nxf6 Nxg4 25.Nxg4 + - [N vs P].

B.2) 23... Kf8 24.Rxh7 Qxf6 (24... Kg8 25.Rh8+ Kxh8 26.Qh4+ Kg8 27.Qh6 and mate in two; 24... Nxg4 25.Rh8#) 25.Nxf6 Nxg4 26.Nxg4 + - [N].

B.3) 23... Kg8 24.Qg5 with the threat 25.Qh6 looks winning.

B.4) 23... Kh8 24.Rxh7+ Kxh7 (24... Kg8 25.Rh8+ as in B.2) 25.Qh4+ Kg8 26.Qh6 and mate in two.

C) 22... g5 23.f6+ Kh8 24.Qxg5 Rg8 25.Rxh7+ Kxh7 26.Qh5#.

D) 22... Nf6 23.Nxf6 Qxf6 (23... Kxf6 24.fxg6+ wins) 24.

E) 22... f6 23.Rxh7+ Kxh7 (23... Kf8 24.Qxg6 and mate next) 24.Qxg6+ Kh8 25.Rf3 and mate in two.

Sep-20-13  M.Hassan: "Difficult"
White to play 22.?
I did it with a chess buddie named "Eric" and in a hurry:

22.f5 exd5
23.fxg6 fxg6
24.Rxh+ Kxh7
25.Rf7+ Kg8
26.Qg6+ Kh8
27.Qg7#
===============
Close but not quite!

Sep-20-13  gofer: I agree with <M.Hassan>, the best way to reply to

<22 f5 exd5>

is with

<23 fxg6 ...>

Black is in a huge hole with three files vunerable to attack and only the king to defend ALL three of them!


click for larger view

Which is why Ne5 is immune and black has to pay

<22 ... exf5>

Sep-20-13
Premium Chessgames Member
  Penguincw: All I did was guess the first move and that's good enough for me. :)
Sep-20-13  TimothyLucasJaeger: I was thinking f5, but more with ideas of f6+ and Qg5-h6. I'll try harder next time.
Sep-20-13  Patriot: 22.f5 looks interesting.

22...exd5 23.exd5 Bb7 24.Rxh7+ Kxh7 25.fxg6+ looks very dangerous for black.

There's a lot more to this. For example, 22...Nf6 or 22...Bxd5 although I'm not too concerned with those.

Sep-20-13  Nova: What a nice white attack! 16. Nd5! was a nice idea, I thought at first, with the idea that if ...exd5 then QxBe7. But after Black moves Bf8, white leaves the knight there! And builds an attack with Rf3-h3, Rf1 and Qg4. It seems to come from no where! Yet Black is tied down with nothing to do because of that pesky knight on d5! Amazing!!
Sep-20-13  montree: A powerful attack out of nothing! f5 screams for it. After 22. f5! defense just breaks like a house of cards.
22... ed5
23. Rh7+ is decisive.
Sep-20-13  Kikoman: <22. f5!> the winning move, and that's it!
Sep-20-13  nariga: How about 22...Nf8?

I dont see any threatening end here.

23. f6+ Kh8 24. Rxh7+ Nxh7 followed by either blocking hite bishop by e5, or taking white pawn on f6, or moving black R to g8, moving pawn to g5 etc.

Sep-20-13  M.Hassan: <gofer>:
What a nice observtion that we missed when attepting to solve the puzzle:

<Black King has to defend ALL three of them>

Sep-21-13  nariga: 22... Nf8 23. f6+ Kh8 24. Rxh7+ Nxh7
25. Qh3 e5 26. Qh6 Rg8 27. Rf3 Bd7
followed by g5 or Qf8 etc.

I think black can wriggle out of this.

Sep-21-13  bubuli55: < nariga: 22... Nf8 23. f6+ Kh8 24. Rxh7+ Nxh7 25. Qh3 e5 26. Qh6 Rg8 27. Rf3 Bd7
followed by g5 or Qf8 etc.
I think black can wriggle out of this. >

Perhaps ...

23. fxg6 fxg6

( 23...hxg6 24. Qf4 Qd2 25. Qh6+ Kg8 26. Qh8# )

24. Qf4 Qd2 25. Nf6 forks Q & R.

Another way Black can lose

22. f5 Nf8 23. fxg6 fxg6 24. Qf4 exd5 25. Qh6+ Kg8 26. Rxf8+ Rxf8 27. Qxh7#

Sep-22-13  nariga: <ubuli55:>...

23. fxg6 hxg6 24. Qf4 f5

Now White will have to soend a move or two to make his attack strong, giving Black some time to free up his Q/R, either take the white Knight on d5 with his B or p, or bring his B to d7 to support his f5 pawn etc.

It looks ugly, but I am wondering if Black can just about survive.

Sep-23-13
Premium Chessgames Member
  kevin86: I guess today was the day to sacrifice the rook!
Sep-23-13  nariga: Also, 22. f5 Rh8 seems to be interesting as well...
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