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Nikita Vitiugov vs Irina Andrenko
Chigorin Memorial (2012), St. Petersburg RUS, rd 1, Oct-27
Modern Defense: Standard Defense (B06)  ·  1-0


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Kibitzer's Corner
Oct-29-12  paramount: whats happen if 23...gxf5?
Oct-30-12  Powerthinker: Definitely, then 24.B:g7 K:g7 25.N:f5+ Kh8 26.B:b7 with decisive edge. And if 24. ...Rd8 , the black squares near the King will become completely vulnerable.
Premium Chessgames Member
  luzhin: Neat: if 54...Rxh5 55.Ng8! wins.
Premium Chessgames Member
  Shams: <luzhin> Yes, 55.Ng8 Rf5 56.Rh5 is major whiplash for Black.
Nov-06-12  vinidivici: I like the move 23.Ndf5.

You need to consider many probabilities. And i dont like to move the interface back and forth looking for fine solutions. Let the brain works. So its like the real match. I only move back and forth the interface to find the solutions if its a complex line and that for save the time.

23.Ndf5 is a tricky move. Looks hard because there are many replies. Bxb2/gxf5/or even Bxg2.

This is example of analytical calculations. I just share a bit of that, so you probably know how a GM thinks.

The point Ndf5 is to open the d5 file for the rook so pinning the d-6 knight. The risks are the 1.unprotected b2 bishop and the f5 knight to the pawn.

Just like u have seen 23...Bxb2 replied by 24.Bxb7
24...Qxb7(to save the rook) and materials back with
25.Nxd6 Nxd6 26.Rxd6

How about 24...Rb8, now the b7 bishop and f5 knight are vulnerable. But its easy to think. The simples is 25.Bxc8 25...Qxc8/Rbxc8 useless because Ne7+ (forking) And there is 25.Ne7+, deserves to watch 25...Nxe7 26.Rxe7 threaten the queen and after queen retreat e.g 26...Qd8 then b-7 bishop can retreat so at least its SAFE. The unprotected b2 bishop its NOTHING.

We come to the f5 knight problem.
If 23...gxf5 (lost the knight) then there are 2 choices 24.Bxb7 or Bxg7

24.Bxb7 Qxb7 25.Bxg7 Kxg7 then 26.Nxf5+ after the king retreat and takingd-6 knight, withe up a pawn. So i guessed 24.Bxb7 isnt bad.

24.Bxg7(threaten the rook) if 24...Bxg2 then 25.Bxf8 white wins the exchange bishop traded with rook.

So after Bxg7 24...Kxg6 left. After 25.Nxe5+ 25...Kg8 26.Bxb7 Qxb7 then 27.Nxd6 again, its a good line all materials are back and even a pawn up for white.

So, the conclusion is 23.Ndf5 is a good move.

Maybe there are mistakes on my calculations, u can correct it yourself. And for the GM level these kind of analysis needed even for A PAWN.

Nov-07-12  vinidivici: its not usual i got no defiant stance on my post!
Premium Chessgames Member
  OhioChessFan: <vini: Just like u have seen 23...Bxb2 replied by 24.Bxb7 24...Qxb7(to save the rook) and materials back with
25.Nxd6 Nxd6 26.Rxd6 >

24. Re7 is also an option.

24. Re7 Nxe7 25. Rxd6 Qxd6 26. Nxd6 Bxg2 27. Kxg2
Strange material imbalance, White is better though.

click for larger view

24...Qd8 25. Bxb7 gets into the same sort of lines as the game but with a Rook in the middle of the enemy camp.

Premium Chessgames Member
  OhioChessFan: Black missed a lot more active move, 26...Qc7 or 26..Qf3. Rad8 was essentially a wasted tempo, since the Rook doesn't do much on that square anyway, and it allows the developing move Re7 with tempo.
Nov-08-12  vinidivici: <OhioChessFan>
<24. Re7 Nxe7 25. Rxd6 Qxd6 26. Nxd6 Bxg2 27. Kxg2 Strange material imbalance, White is better though. >

yup, missed that. was thinking about Re7 a bit. But didnt keep up the analysis. Maybe thats good.

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