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Oscar Humberto Castro Rojas vs Daniel Hugo Campora
Cucuta (1979)
Bishop's Opening: Vienna Hybrid (C28)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
May-09-15  diagonalley: hmmmm.... got the theme easily enough, but didn't anticipate 16.... O-O-O still, i reckon that's worth at least half a credit :-)
May-09-15
Premium Chessgames Member
  An Englishman: Good Evening: Got stuck after seeing the first two moves, so no credit for me. Have the silicon monsters looked at every Black defense after White's first two moves? What is the refutation of 16...f6; 17.e5,dxe5; 18.Bxe5,fxe5; 19.Qxe5+,Kf7? Or in the game continuation after 17.Nb5, how does White refute 17...Qc5 or 17...Qb6?
May-09-15  dfcx: I think I got the first 3 moves.
15.Rxd4 exd4 16.Qxd4

Black has several choices, none of them very good.
A.16...O-O-O 17.Nb5 winning the a7 pawn and weakening black's queen side.

B.16...O-O 17.Nd5 centralize with tempo. black's king side is already weakened.

May-09-15  stst: One line among the many options in an 'early' game:

15.Rxd4 exd4
16.Qxd4 Rg8
17.Nd5 0-0-0
18.Qxa7 Kd7
19.Qd4 Rg6
20.Re1 .....

try after some more pondering....

May-09-15
Premium Chessgames Member
  Gilmoy: Even after peeking, I had to hunt for the win.

<19.exd6> with N+PP for R. Black can trap the B, but White whips up dainty mate threats:

19..f4 20.Rd1 fxg3 <I looked at 20.Bxf4 gxf4 for a Q tour to the h3-d7 diagonal, but the Ng5 resource is very annoying> 21.Qg7 <breaks pin with mate threat> Qb6 <not Qc6 22.Nxa7+, nor Rxd6 22.Qxh8+ -- this is the brittleness in 16..O-O-O> 22.dxc7:


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This is the "ant major" mate pattern: now a white-diagonal Q check is matish.

22..Rxd1+ <it can't leave protection of d7> 23.Kxd1:


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Black is close to zugzwang.

23..Rf8 <stops a later Qf5+> 24.hxg3 and White ignores the Nh7 for 25.Qe7! Δ Nd6+.

23..Re8 <stops Qe7> 24.Qxh7 Δ Qf5+.

May-09-15
Premium Chessgames Member
  morfishine: Black's position is odd: 1 Knight placed forward. 1 Knight awkwardly off to the side & his King is uncastled. A straightforward exchange-sac <15.Rxd4> eliminates Black's only developed piece leaving White with a positional advantage. After 15...exd4 16.Qxd4 the White Queen targets the rook on <h8> and is ready to capture the a-pawn in the event of 16...O-O-O. Not to mention, the White Knight has a nice post at <d5>


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After all that, I figured Black's best chance was the risky 16...O-O

*****
<Gilmoy> Nice post on the ramifications of 19...f4

*****

May-09-15  stacase: I got the first two moves, but I wouldn't have done it over the board.
May-09-15  Romildo: <Gilmoy>, in your line, what happens if white plays 24.hxg3 and black goes for 24...a6?
May-09-15
Premium Chessgames Member
  Penguincw: 15.Rxd4 exd4 16.Qxd4 (castling) was obvious, but that's all I got.
May-09-15
Premium Chessgames Member
  Fusilli: <Gilmoy> et al. In your line, there is no need to rush to take the bishop. I suspect black must have something better.

I think it's more direct:

19... f4 20. Nxa7+ Kb8 21.dxc7+ Kxc7 22.Qc5+ Kb8 23.Qe5+ and black will have to give up material or face the smothered mate.

I suppose 22...Kd7 23.Rd1+ must be catastrophic too.

May-09-15
Premium Chessgames Member
  sfm: <Fusilli: I think it's more direct: ...
19... f4 20. Nxa7+ Kb8 21.dxc7+ Kxc7 22.Qc5+ Kb8 23.Qe5+...>
-,Kxa7
May-09-15  BOSTER: <Gilmoy: I had to hunt for the win>. After 17...Qc5 white has no any chance to win such game.
May-09-15
Premium Chessgames Member
  Fusilli: <sfm> Oops. Yeah, and it wouldn't be smothered mate with the a7 pawn gone anyway!

Now I asked Stockfish. After 19...f4 20.Nxa7+ Kb8 21.dxc7+ Kxc7


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22.Qe5+ Kb6 23.Nb5 wins.

May-09-15
Premium Chessgames Member
  morfishine: <BOSTER> You know BOSTER, I really don't like you that much, but I gotta admit, I think you are right about 17...Qc5, a move (improvement) previously noted by <An Englishman> in these kbitzing pages

*****

May-09-15
Premium Chessgames Member
  chrisowen: Bag d4 gab down in jail seems like

in bagavond sag bruv in sawdust vacuum clean gas mind d4 drive choco block rove savvy glib again as mind info ok laid low ash good safe head oh hick kind as nick ar good crate crevice ogle tip part trip ok in ogle light minimal plight rook dink paly part have mind rove an dim change vets eg ment a toe aka creep cackle an ignitions hive at ellucidate am rejoinder it erm in at our rave dink fluury it ok in ogle chronic ave creak arrive creak around i nash hand blow tint vision select mission save peg light mister ave ogle lemon c6 maybe although lime b5 could castle monarch eg win safe 0-0 just am pawn down by all accounts again cruise at wave in cad d4 dive am duck and cover it aha in snip ar good oblivious again kind room dank and dusty rob d4 foam at mouth in value added it eddy am route won ash wave in toot be confirm castle long bad wins b5 at truth am an beset on all sides again as have tell bovver ive at good won did d4 ave for won i be proof at

angle son slide away in light ash amps every good chance am cad fluffs aim camp i cutoff point in dig bind rook glean huffle and shuffle ash head i dipoff again dreams i et tu brute vet am beneaths am wave be

fine b5 ash am flurry a7
it now in about lovely half turn am

May-09-15  BOSTER: <You know BOSTER, I really don't like you that much>.

This is The secret of Polichinelle.

Don't be disappointed but you are not alone in this company.

"In the computer age,we can not handle the truth".

May-09-15
Premium Chessgames Member
  kevin86: The rook sac turns the game into a quick win for white.
May-09-15
Premium Chessgames Member
  agb2002: White has a bishop for a knight.

Black threatens 15... Qxc4.

The first idea that comes to mind is 15.Rxd4 exd4 16.Qxd4 but after 16... Rg8 followed by ... Qb6 and ... 0-0-0 White's compensation looks dubious.

Another idea is 15.h4, trying to exploit the defenseless pawn on h6, to open the h-file and to take advantage of a possible pin, but after 15... 0-0-0 16.hxg5 Nxg5 17.f4 exf4 18.Bxf4 Nde6 19.Bxg5 Nxg5 20.Qxa7 Nxe4 21.Nxe4 Qxe4 Black doesn't look in much trouble.

Another option is 15.f4, trying to weaken the dark squares but after 15... gxf4 16.Bxf4 exf4 17.Qxd4 Rg8 White doesn't seem to have a winning advantage.

I don't know. I'd probably play 15.h4.

May-09-15  Tiggler: This is a puzzle with no solution, because the game continuation is refuted by 17...Qc5, as noted by <An Englishman> and by <BOSTER>.

I like 15.f5 . The variation given by <agb2002> may not be a clear win, but white does have a very promising advantage, because black cannot take the g2 pawn, cannot castle 0-0-0 immediately, and will lose his f4 pawn after 18.Nd5

May-09-15  Tiggler: <I like 15.f5> I meant 15.f4
May-09-15  devere: 15. Rxd4 exd4 16. Qxd4 O-O 17. f3 f5 18. Nd5 Rae8 19. h4 Qc5 20. Qc3 f4 21. b4 Qc6 22. hxg5 fxg3 23. Rxh6 Re5 24. c5 Qd7 25. Nf6+ Nxf6 26. gxf6 Qe6 27. f4 Qg4 28. fxe5 Qf4+ 29. Qd2 dxe5 30. Rg6+ Kf7 31. Qxf4 exf4 32. Rg4 Ke6 33. Rxf4 Ke5 34. Rf3 Kxe4 35. Rxg3 Rxf6 36. Rg7 Rc6 37. Kb2 b6 38. cxb6 axb6 39. a4 Kd4 40. g4 Rc4 41. c3+ Kd5 42. Kb3 Rc6 43. b5 and White is clearly winning.


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Nothing to it! LOL. 15.Rxd4 is a nice positional exchange sacrifice that works.

May-09-15
Premium Chessgames Member
  patzer2: Here's a look at today's Saturday puzzle (15. ?) and some key positions in the game with the Opening Explorer (OE) and Fritz.

<5...h6> This is the most frequently played move. However, the Fritz suggestion 5...0-0 = also looks good.

<6...d6> This is the most common move in the OE, however a good option is 6... Na5= as in F Castaldo vs O Gritsak, 2010.

Also good for equality is 6... Bxc3+ = as in
R Mamedov vs Tomashevsky, 2009

<9...Bxc4?!> This appears to be where Black's game starts to go down hill. The isolated pawn on c4, after 10. dxc4 , surprisingly favors White.

Surely 9... g5! 10. Bg3 Qe7 = or 9... Nd4! 10. f3 O-O = are better options for Black.

<13...Nd4?!> Black makes a mistake by being in too much of a rush to post the Knight in the center (i.e. moving the Knight twice in the opening before completing development), and in the process critically neglects development. More prudent would have been developing with 13... O-O-O .

<14. Qe3!> Now White stands better.

<14...Qc6?> This move, making the unwise choice of moving a second piece twice before completing development, appears to be Black's decisive error.

May-09-15
Premium Chessgames Member
  patzer2: <15. Rxd4!! to > This powerful positional exchange sacrifice, which solves today's Saturday puzzle, gives White a strong and likely decisive advantage.

The best alternative is 15. f4!?, which was my failed attempt at solving today's Saturday puzzle. It's an interesting try, but according to Fritz fizzles out to equality after 15. gxf4 16. Bxf4 Qxc4! (not 16... exf4? 17. Qxd4 ) 17. Bxh6 O-O-O 18. h4 Qe6 19. Qd2 =.

<15... exd4 16. Qxd4 O-O-O>

If 16... f6, White has a strong and likely winning advantage after 17. Nd5! when Fritz indicates play might continue 17...Rf8 18. h4 Kd7 (18... g4 19. c5 dxc5 20. Qd1 h5 21. Nxc7+ ) 19. hxg5 Nxg5 20. Rxh6 Rae8 21. f3 Kc8 22. Nxf6 Re6 23. Bh4 Nf7 24. Qxa7 Qa6 25. Qxa6 bxa6 26. Rh5 Re5 27. Rh7 Re7 28. Rg7 Re6 29. Nd5 Rh8 30. Rxf7 Rxh4 31. Rxc7+ Kb8 32. b4 Rh2 33. Rg7 Reh6 34. Kb2 Rh7 35. Rg8+ Ka7 36. f4 Rb7 37. f5 Rb8 38. Rxb8 Kxb8 39. g4 Kc8 40. g5 Kd8 41. g6 Rg2 42. b5 axb5 43. cxb5 Kd7 44. b6 Kc8 45. f6 Rg1 46. f7 Rf1 47. g7 .

If 16... O-O, White also appears to win after 17. Nd5! when Fritz indicates play might continue Rae8 18. f3 (not 18. Qxa7 Rxe4 =) 18... Qc5 (18... a6 19.h4 Re6 20. hxg5 hxg5 21. Qd3 f6 22. Ne3 Ree8 23. Nf5 Qc5 24. Kb1 b5 25. cxb5 axb5 26. Qd2 Qc4 27. b3 Qe6 28. Qc3 Qd7 29. Qd3 Re6 30. Nd4 Ree8 31. Kb2 Rb8 32. Nf5 Qe6 33. Nh6+ Kg7 34. Qc3 Rb7 35. Bf2 Rfb8 36. Nf5+ Kg8 37. g4 c5 38. Bg3 Rd7 39. Nh6+ Kh8 40. Qa5 Nf8 41. Nf5+ Kg8 42. Rh6 b4 43. axb4 cxb4 44. Kc1 Rh7 45. Bxd6 Re8 46. Rxh7 Kxh7 47. Qxb4 Nd7 48. c4 .

If 16... Rg8, White again gets a strong edge with 17. Nd5! when Fritz indicates play might go 17...f6 18. h4 g4 19. e5 dxe5 20. Bxe5 fxe5 (20... Kf7 21. Bxc7 ) 21. Qxe5+ Kd7 22. Qf5+ Kd8 23. Rd1 Qd7 24. Nf4 .

<17. Nb5! Qa6?> This mistake crushes any reasonable chance of a draw for Black.

Black can put up more resistance with 17... Qc5, but Fritz indicates White has a strong and near winning advantage after 18. Qxc5! dxc5 19. Bxc7! Rd7 20. Be5! Rg8 (not 20... a6?? 21. Na7+ Kd8 22. Bxh8 ) 21. Nxa7+ Kd8 22. f3 to (+1.76 @ 20 depth).

<18. e5!> This second surprise move is the crusher for Black.

<18...f5> If 18... dxe5, then White wins with 19. Qxe5! as play might continue 19...Qb6 (19... Rd7 20. Qxh8+) 20. c5 Qa5 (20... Qc6 21. Nxa7+ Kb8 22. Nxc6+) (20... Qxb5 21. Qxc7#) 21. b4 .

If 18... c6 19. Nxd6+ Kb8 20. e6! is crushing.

<19. exd6 1-0>

Black resigns as White has a strong winning attack. Here, Fritz indicates play might continue 19...f4 20. Nxa7+ Kb8 21. dxc7+ Kxc7 22. Bxf4+ gxf4 23. Qe5+ Kb6 24. Nb5 Rc8 25. Rd1 Rhd8 26. Rd6+ with mate soon to follow.

May-09-15  Cheapo by the Dozen: The exchange sacrifice was obvious, but after that I looked at one of the possible lines, didn't work it through to a clear win, and decided I wasn't going to even try to fight all the way through the puzzle. :)

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