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Boris Spassky vs Leonid Stein
Moscow (1971), Moscow URS, rd 13, Dec-12
Gruenfeld Defense: Exchange. Spassky Variation (D87)  ·  1/2-1/2

ANALYSIS [x]

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Kibitzer's Corner
Aug-13-05  percyblakeney: In OMGP III Kasparov refers Kondratiev's analysis on Spassky's missed win on the 28th move. 28. Qxd3 Bxe4+ 29. Kh2 Bxd3 30. Rc8+ Kg7 31. Rc7+ Kf6 32. g7 would have won, an alternative is the amazing 28. gxh7+ Kxh7 (or Kh8 29. Rc8+ Bxc8 30. Qxd3 Kxh7 31. e5+ Kh8 32. Qg6) 29. Rc7+ Kh8 30. Rf3 Bxe4 31. Kh2. Kasparov calls the latter line "a unique win, discovered a quarter of a century before the invasion of computers into the laboratory of chess analysts".

Also on the 29th move there is a win for white: 29. Qxd3 hxg6 30. Qd5+ Kg7 31. Rc3 and there is no perpetual for black if he tries Bxh3+.

Nov-14-12  Zugzwangovich: <percyblakeney> Re the latter line, in "Boris Spassky: Master of Initiative", Raetsky and Chetverik claim that it was Fritz that found 31.Kh2!!
Nov-14-12  Olavi: Salo Flohr gives the line up to and including 31.Kh2 in Schach-Echo 1/1972.
Nov-14-12  Zugzwangovich: Sounds like Raetsky and Chetverik were rather off the mark.
Jun-28-13  csmath: Generally I do not like the position for black after 20 moves because black knight is out of the game. It looks bad.

After
28. ... Rxd4?
it is forcibly lost. Now Stein obviously thought that position is not good without radical action but 28. ...Rxd4? makes it much worse.

It was surely better to play

28. Bxd4 Bxd4
29. Qe3 Qe5
30. Be2!

and here again white has advantage due to absence of black knight from the game. The plan is h4-h5. The best attempt for black is to bring knight into the game:

30. ... Rd6
31. h4 Nc6!
32. h5 gxh5
33. Rcd1 Nd4 (back in the game)
34. Bxh5 Rad8
35. Qg5+ Kh8
36. Kh2 (heading for h3 if possible)

Here black could be defended but there is a long and messy road ahead.

This game ought to be connected with two games Spassky played with Fischer in 1966 (P-Cup) and 1970 (Siegen OL).

Jun-28-13  csmath: To avoid getting into position after 20 moves black could have played

20. ... gxf5!

and now white will have no center and equaly bad king. Black still has a problem of bringing knight into the game but it is not as hard now.

21. bxc4 (trying to stop black knight) Bxe4! (black gives away his trump card bishop)

22. Bxd4 fxd4
23. Rf4 Nc4!

knight is back in the game and the position is dinamically even although quite uncertain. Objectively the best for white is to go for exchange sacrifice and perpetual.

Jul-08-16
Premium Chessgames Member
  dernier loup de T: Olavi:

Salo Flor, yes, and O'Kelly made immediately echo in "Europe Echecs"; so, specially because of Flohr, it's sad to admit that Kasparov li...., euh, forgot to say the truth; the same for Raetsky and Chetverik...

Jul-08-16
Premium Chessgames Member
  offramp: <dernier loup de T: Olavi:
Salo Flor, yes, and O'Kelly made immediately echo in "Europe Echecs"; so, specially because of Flohr, it's sad to admit that Kasparov li...., euh, forgot to say the truth; the same for Raetsky and Chetverik...>

No. The first post says:
<Kasparov calls the latter line "a unique win, discovered a quarter of a century <before> the invasion of computers into the laboratory of chess analysis">.

Oct-15-18
Premium Chessgames Member
  dernier loup de T: Sorry, offramp: you're right; and I should review a little deeper my english!...
Jul-04-19
Premium Chessgames Member
  dernier loup de T: <csmath>: after 20....gxf5 (better indeed), Spassky can still play for the win by 21.Bxd4...

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