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Tigran Vartanovich Petrosian vs Robert James Fischer
USSR vs. Rest of the World (1970), Belgrade SRB, rd 4, Apr-04
Gruenfeld Defense: Three Knights Variation (D90)  ·  1/2-1/2


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Kibitzer's Corner
May-23-09  chesswonder: I think white has a better position after capturing the knight.
Jun-07-11  joelsontang: Lou Hays says 10...Qd5! (probably preventing white from developing his light-squared bishop). But it seems to me after 11.Nb5 11...Qxd1 12.Rxd1 white has too much pressure. Is this line of the Grunfeld playable still?
Jun-08-13  RookFile: Fischer knew what he was doing in the endgame to hold this. 1-0 was certainly a possibility here with inaccurate play.
Oct-27-13  Owl: Why doesn't Petrosian try to infiltrate with his king by using his rook as a blocking mechanism... in the rook endgame?
Oct-27-13  parisattack: Amazing defense by Fischer. Black's position looks blown right out of the opening.
May-06-15  Howard: Petrosian probably missed something here.
Jun-09-19  saturn2: Are there experiences with 7...Nc6?

Sometimes I am confronted with this move in blitz and black always gets good play. For example

8. dxc5 Nxc3 9. Bxc3 Qxd1+ 10. Kxd1 Bxc3 or

8. Nxd5 Qxd5 9. Rxc5 Qxa2

Premium Chessgames Member
  beatgiant: <saturn2>
I believe the "book" reply is 7...Nc6 8. Nxd5 Qxd5 9. Rxc5 Qxa2 10. Bc3 followed by 11. e4. With Black's queen offside, White probably has a small advantage.
Jun-11-19  saturn2: <beatgian I believe the "book"> My opening book is from Suetin and 50 years old.

In your and also my line (see original post) it could continue like 7...Nc6 8. Nxd5 Qxd5 9. Rxc5 Qxa2 10. Bc3 Be6 ?! 11. d5 Bxc3+ 12. bxc3 Qa3 13. Rxc6 bxc6 14. dxe6 Qxc3+ 15. Qd2 Qa1+ 16. Qd1 Qc3+ 17. Nd2 Rd8

Maybe to make progress in chess I should buy newer ooening books and a computer - something I have refused so far.

Jun-11-19  SChesshevsky: <saturn2> In the 8. dxc5 line, it looks like you can keep the pawn and though maybe a little behind in dev it might not be so bad with the pieces off. If that's true, I'd guess blacks chances of winning aren't very good and he might even have a tough time proving equality. Have you given this line many tests?
Premium Chessgames Member
  keypusher: <beatgiant> <saturn2> <Schesshevsky>

SF10 pretty much agrees with <SChesshevsky> about 8.dxc5 Nxc3 9.Bxc3 Qxd1+ 10.Kxd1 Bxc3 11.Rxc3 (+1.04, 39 ply). It prefers 8....Be6 or 8....0-0.

After 7....Nc6 8.Nxd5 Qxd5 9.Rxc5 Qxa2 its evaluation is +0.73 at 40 ply. Its main line goes 10.Bc3 Be6 11.e4 Bb3 12.Qc1 0-0 13.d5(!?) Bxc3+ 14.Qxc3 Rfd8(!) 15.Nd2 Qa1+ 16.Qc1 Qxc1+ 17. Rxc1 Nd4 18.Nxb3 Nxb3 19.Rc3.

SF thinks Fischer's 7....Nxc3 is best, and it's hard to disagree. After 8.Bxc3 cxd4 9.Nxd4 0-0 10.e3, any of 10....Qd5, 10....Nd7, 10....e5, and 10....Bd7 all clock in at 0.00. Petrosian shouldn't have gotten anything out of this insipid opening.

Jun-12-19  saturn2: Thx to all clarifying this opening. One point in playing it in blitz is that it contains a little trap.

After 7.Rc1 black might think he wins a pawn.

7...Bxd4? 8. Nxd4 cxd4 9. Nxd5 or

7...cxd4? 8. Nxd5
In both cases black cannot retake Nxd5 and loses a piece.

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