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Marcio Melgosa vs Oscar Humberto Castro Rojas
Barranquilla Carnaval Cup 10th (1999), Barranquilla COL, rd 4
Center Game: Berger Variation (C22)  ·  0-1



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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Jul-15-15  diagonalley: a fine tactic, which sadly i missed :-( ... (quite hard to visualise for a wednesday)
Premium Chessgames Member
  whiteshark: What's wrong with <28...Nxc3 29. bxc3 Qa3+>? After 30.Kb1 Rxc3 is winning and after 30.Kd1 Qa1+ 31.Qc1 Rd3+ 32.Rd2 Ne3+ is winning, too.
Jul-15-15  saturn2: @whiteshark: White does not retake after 28..Nxc3 but fork Queen and Rock with 29 Nf5
Jul-15-15  morfishine: White has one threat 29.Nf5, so Black must move quickly: <28...Rxc3> pinning White Queen, but after 29.bxc3 Qa3+ both White's responses lose: (1) 30.Kd1 Ne3+ forking or (2) 30.Kb1 Nc3+

Black control of <d2> & <b2> makes this work


Premium Chessgames Member
  whiteshark: <saturn2> Thanks!

D'oh! I suffered from tunnel vision and counter-tactics striked back again.

Jul-15-15  Nick46: I got it today after getting out the bits of wood. I agree with Phony Benoni and am surprised by diagonalley, whom I consider a few ELO brownie points above me.
Jul-15-15  zb2cr: Found this one only after wasting time with 28. ... Nxa3.
Jul-15-15  starry2013: I thought of the knight sacrifice very quickly, after seeing moving the other knight would go nowhere. The variations against the computer probably weren't as concise as they should be (had to get my king safe), but I won...

Nxc3 2.bxc3 Qxa3+ 3.Kb1 Rxc3 4.Re1 g6 5.Re8+ Kg7 6.Qxc3 Qxc3 7.Nf3 Na3+ 8.Ka2 b4 9.Ree2 Nc4 10.Nd4 a4 11.Rb2 Nxb2 12.Rxb2 b3+ 13.Nxb3 axb3+ 14.Rxb3 Qc4 15.f5 d5 16.fxg6 fxg6 17.Kb2 Qxb3+ 18.Kxb3 Kf6

Nxc3 2.bxc3 Qxa3+ 3.Kb1 Rxc3 4.Re2 g6 5.Re8+ Kg7 6.Qe2 Qb4+ 7.Nb3 Qxb3+ 8.Ka1 Rc2 9.Qxc2 Qxc2 10.Re2 Qxe2 11.Rb1 a4 12.f5 a3 13.Rb4 Qd2 14.f6+ Kxf6 15.g5+ Kxg5 16.h4+ Kxh4 17.Rb3 Qd1+ 18.Ka2 Nd2

Nxc3 2.bxc3 Qxa3+ 3.Kb1 Rxc3 4.Re2 g6 5.Re8+ Kg7 6.Qa2 Qb4+ 7.Ka1 Ra3 8.Re2 Rxa2+ 9.Kxa2 Qa3+ 10.Kb1 Qd3+ 11.Ka2 Qxd4 12.f5 Qd3 13.Rf2 f6 14.fxg6 hxg6 15.Rfh2 b4 16.Ka1 b3 17.Rb1 a4 18.Rhb2 Na5

Jul-15-15  patzer2: <whiteshark><saturn2> After 28...Nxc3 29. Nf5 (diagram below)

click for larger view

I also though Black was busted, but Deep Fritz 14 x 64 @ 24 depth indicates it's a win for Black (diagram above) with 29...Qe6! or 29...Qc5! :

1. (-4.54): 29...Qe6 30.bxc3 Re1+ 31.Rxe1 Qxe1+ 32.Qd1 Qxf2 33.Qxd7 Qxf4+ 34.Kd1 Qf1+ 35.Kc2 Qf2+ 36.Kc1 h5 37.Ne7+ Kh7 38.Qd8 Qg1+ 39.Kc2 Qg2+ 40.Kc1 Qb2+ 41.Kd1 Qb1+ 42.Ke2 Qe4+ 43.Kf2 Qf4+ 44.Ke2 Qe5+ 45.Kf2

2. (-4.28): 29...Qc5 30.Rd2 Nxa3 31.Nxe3 Nxc2 32.Nxc2 Nd5 33.Re1 g6 34.f5 b4 35.Kb1 b3 36.Nd4 Qb4 37.Kc1 Qa4 38.Kd1 Nf4 39.Re8+ Kg7 40.Ne2 Nxh3 41.fxg6 hxg6 42.Rxd7 Qa1+ 43.Kd2

P.S.: So if Fritz is correct, three moves which solve our Wednesday puzzle are 28...Rxc3!! (-9.14 @ 21 depth), 28...Nxc3! (-4.60 @ 21 depth) and 28...Nxa3 (-2.61 @ 21 depth).

Jul-15-15  dfcx: Black is down an exchange with N+P for Rook.

The white king is caged in the back rank.

28...Rxc3 29.bxc3 (or lose the queen) Qxa3+

A. 30.Kb1 Nxc3+ 31.Qxc3 Qxc3 with threat of Na3 mate 32.Nc2 Qb2# or 32.Ra2 Qxd4

B. 30.Kd1 Ne3+ 31.Ke1 Nxc2+ 32.Nxc2 (Rxc2 33.Qa1+) Qc1+

C. 30.Qb2 Nxb2 31.Rxb2 Qxc3+ 32.Nc2 Nb4

Premium Chessgames Member
  Penguincw: Hmm. Like others, I thought 28...Nxa3 29.bxa3 was the answer. However, my move of 29...Qxa3+ is probably not the greatest.
Premium Chessgames Member
  kevin86: White must lose the queen or allow the attack to come in.
Premium Chessgames Member
  Zhbugnoimt: Found this one in a few seconds. 28...Rxc3! 0-1
Jul-15-15  KingsGambiteer: I've asked before but I still don't understand. What's up with chrisowen's posts?
Jul-15-15  rainingpieces: 28..Rxc3 29.bxc3 Qxa3+

a) 30.Kb1 Nxc3+ wins the queen

b) 30.Kd1 Nxc3+

b1) 31.Qxc3 Qxc3

b2) 31.Ke1 Qa1+ mates

Jul-15-15  starry2013: I'd definitely want to keep my rook, I suppose I'm weak enough to need it in the ensuing play.
Jul-15-15  starry2013: Having said that I just delayed exchanging the rook anyway. You just have to move the queen around well to win.
Jul-15-15  Nick46: KingsGambiteer: I empazhise with you and don't doubt that others do too, but.... 1. Ours is not always to reason why.
2. Read the v. reasonable rules and regulations of this great website.
Jul-15-15  Nick46: empathize !!!
Jul-15-15  BOSTER: <MindCtrol9:I saw this one really quick>.

Once I saw the Hottest Women's Beach Volleyball.
Certainly most men pay more attention at Micro Bikini. And when I asked my neighbor, what is the score, he looked at me like my question is coming out of the blue. The less we know, the more we feel.

How all this is related to the puzzle?
I always try to get more information, more details about the pos.

What I saw that white queen and king
are on the same line: it means that queen can be pinned. Then I saw black knights <hit> the same square e3. I like such knight structure when they <hit> the same square. For ex. Nb5 and Ne5 looking at f7, and pawn a3 is a weakness.

Jul-15-15  BOSTER: < CHESSTTCAMP : Not much play to review>.

Enough white to play 26.Rg3 or Rd1, you'd have even POTD.

Jul-15-15  Pedro Fernandez: <Sharky> 28...Rxc3 was obvious, but let me tell you something: in more trivial puzzles I have been blind! Greetings my dear friend. PS. Well, it also was obvious that my dear friend <chrisowen> was going to be not so trivial this time.
Jul-15-15  Pedro Fernandez: For instance, 28...Rxc3! 29.Nf5 (29.bxc3?? is bad idea} Rxc2+ 30.Rxc2 Qxf4+ 31.Kb1 (31.Kd1?? is not a good idea) Nd2+ 32.Ka1 (32.Ka2?? is bad idea) and now 32...Qe4 is too much strong, 0-1. PS. No machines were used in this analysis, so any criticism is welcome.
Jul-16-15  Pedro Fernandez: And BTW, this analysis was made in a couple minutes, though I could be mistaken.
Jul-16-15  CHESSTTCAMPS: <<agb2002: >I can't remember where I put my Chrisowenish-Spanish dictionary).> Ah, that is secret, so it is probably designed to self-destruct.
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