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Daniel Garcia Zarabozo vs Ivan Andres Gonzalez
Asturias-ch36 U20 (2003), Aviles, rd 6, Jan-02
Queen Pawn Game: Colle System. Anti-Colle (D04)  ·  0-1
ANALYSIS [x]

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sac: 20...Ng5 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
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Feb-19-14  Cheapo by the Dozen: I used to play the Colle System when I was ~10 years old, and I find this game embarrassing on behalf of Colle players everywhere.
Feb-19-14  YetAnotherAmateur: <Cheapo by the Dozen>

One mistake in your main line: 25. ... ♕d3 is not in fact mate. You have to finish it off with 26. ♔e1 ♖h1#

Another line I haven't seen so far is:

21. ♕a3 ♘f3+
22. ♕xf3 exf3
23. anything ♕g2#

Feb-19-14
Premium Chessgames Member
  rinkol: I share M.Hassan's suspicions about 16.Ng2. Forcing the exchange of the black bishop for the knight isn't particularly helpful in this position, though it is possible that white thought that the resulting pawn on f4 would prevent Ng5! I would also suggest that 9. O-O was premature; it gives black an obvious target. Again, c4 or possibly Bd3 would have been more circumspect.
Feb-19-14  MountainMatt: Looks like it's officially "Knight sac week"! 20...Ng5 is going to (just like yesterday) lead to mate no matter what. If 21. fxg5, then 21...hxg5 22. Rd1 Qxh2+ 23. Kf1 Qh1+ 24. Ke2 Qf3+ and then mate with Qd3; if white declines the knight it's still a quick mate; and there's obviously no chance to save with checks after 21. Qxa7 Nf3 22. Qa8+ Kd7 23. Qa4+ c6. My first successful Wednesday in quite a while...thank You Jesus!
Feb-19-14  PJs Studio: But how many of us would play 19.Nf4? Defensive puzzles are great teaching tools. I'd like to see some of those featured here.
Feb-19-14  Cheapo by the Dozen: <YetAnotherAmateur>,

I think you misread my line. I wrote Re1 rather than the Rd1 you evidently -- and quite reasonably -- assumed.

Feb-19-14  PJs Studio: Check that. After 17...0-0-0 18.c5 is required.
Feb-19-14  Cheapo by the Dozen: <Gilmoy> makes a good case about Black's attack actually punching through. Interesting!
Feb-19-14
Premium Chessgames Member
  kevin86: A repeat of yesterday: the knight is sacrificed so that the file is open and mate follows.
Feb-19-14
Premium Chessgames Member
  gofer: <20 ... Ng5>

Black threatens 21 ... Nf3+ 22 Kh1 Qxh2#. White has only two responses...

21 fxg5 hxg5
22 Rd1 Qxh2+ (Re1 loses faster)
23 Kf1 Qh1+
24 Ke2 Qf3+

25 Ke1 Rh1+
26 Kd2 Qd3#

26 Kd2 Qd3+
25 Ke1 Rh#

<21 f3 ...>

Black as lots of choices here, but the simplest leads to a winning advantage that is difficult to ignore...

<21 ... Nxf3+>

<22 Rxf3 gxf3> (Kf2 Qxh2+ 23 Ke3 Rxd4 is terminal for white)

<23 Qc2 Rxd4>

Black has won two pawns and an exchange. This in itself is winning, but white even has developmental problems with Ra1 so in reality the positional advantage is massive.


click for larger view

One possible continuation is...

<24 Be3 Rd3>
<25 Bc5 Rhd1>
<26 Bb4 ...>

White is still hopeful of surviving this on-slaught...

<26 ... e3>

Black threatens Rd2 mating AND e2 or e3 winning easily

~~~

Yep! Almost just like <Gilmoy> put it...

Feb-19-14  LIzzard: Guess this is sacrifice to clear the file week. Tracking the Qf3 at the first knight move was really the trigger here. Cheapo - you raise the other issue in that black should be prepared for a temporary mate dodge.
Feb-19-14  BOSTER:


click for larger view

This is pos. white to play 18.
< M .Hassen put 15.Ng2??,>I'd put 15..Ng2! After 18.c5 (threat Nf4)
black can resign.

Feb-19-14  BOSTER: Read 16.Ng2.
Feb-19-14
Premium Chessgames Member
  keypusher: Since you know it's a puzzle, the first move is easy. 20....Ng5 is the only puzzle-like possibility, and thematically it fits in with yesterday's puzzle too.

If I reached this position OTB, I'd probably play 20....h5?

Also, it's not so easy to see 25....Qd3+ if you're trying to visualize from the initial position.

Feb-19-14  LIFE Master AJ: I got 20...♘g5; fairly quickly.

But then I calculated for a couple of minutes to confirm that White could not wiggle his way out.

Feb-19-14  JimNorCal: I got the main line but didn't consider the tougher defensive try f3. Many thanks to <gilmoy> for excellent analysis of that move. Pretty!
Feb-19-14  PJs Studio: Great post Gilmoy. Boster, after the good try of 18.c5 black just plays 18...Nh7 winning anyway. But if black did move the bishop he would lose his queen instantly to 19.Nf4
Feb-19-14  BOSTER: Pjs Studio 18...Nh7 19.cxd6 Ng5 20.Nf4 Nf3+
21 .Qxf3 exf3 22. Nxh3 gxh3 23.dxc7 and game is over.
Feb-19-14  Patriot: Material is even.

20...Ng5

21.fxg5 hxg5

21.f3 Nxf3+ 22.Rxf3 gxf3

Feb-19-14  Patriot: Nice job <morf>!
Feb-19-14  BOSTER: Even lf 21...Qxf1 22.Kxf1 gxf3 white is better.
Feb-19-14  PJs Studio: Boster - I stand corrected. Your line matches solid analysis. Thanks for reminding me I have to look more closely!

Black is busted after 18...c5 ...? I can't find anything else.

Feb-19-14
Premium Chessgames Member
  rinkol: Boster - you are correct about 18. c5!. Black has a resource in 18. ...Be5, but it does not seem to be adequate.

This illustrates the danger of drawing inferences from the end result of a game: White won, ergo Black's position must have been worse.

Feb-20-14  LIFE Master AJ: POTD for Wednesday; February 19th, 2014. The position after 20.exf4, Black to move:


click for larger view

Apr-25-14  LIFE Master AJ: Not a good game ... for Colle fans.
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