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Tigran V Petrosian vs Viktor Korchnoi
Korchnoi - Petrosian Candidates Quarterfinal (1980), Velden AUT, rd 4, Mar-15
Nimzo-Indian Defense: Normal Variation. Bishop Attack (E47)  ·  1/2-1/2

ANALYSIS [x]

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Kibitzer's Corner
Jun-25-14
Premium Chessgames Member
  Zenchess: 38. Nf5!! wins.
Jun-25-14  Poulsen: <Zenchess><38. Nf5!! wins.>

Hmm - perhaps. I haven't analyzed in depth, but black indeed have serious problems after 39.-,Nxf5 40.exf5. F.x. the rook properly must leave the g-file to avoid being captured - and that means 40.-,Rd6 - but after 41.Qg3 black cannot avoid mate without losing material, since the black queen is overloaded in protecting both d6 and c8.

What else then? 39.-,Nc6 loses a piece after 40.Rxc6.

But what about 39.-,Kf8?. I may be blind here, but I don't see a clear win right away. Is 40.Qd4 decisive?

Apr-04-15  Howard: Any help from readers here would be appreciated ?

Did Petrosian blow a win here ?

Apr-04-15
Premium Chessgames Member
  thegoodanarchist: <Howard: Any help from readers here would be appreciated ?

Did Petrosian blow a win here ?>

Yes, he did. <Zenchess'> suggestion of 38. Nf5! is indeed the star move, with best play going something like

38.Nf5 Nxf5 39.exf5 Rd6 40.Qg3 f6 41.Re1 Kf8 42.Bb2

and Black will lose a piece and the game.

Apr-04-15
Premium Chessgames Member
  thegoodanarchist: Of course Black could refuse to capture White's knight, by playing 38...Re6, for example.

But leaving the beast on the board gives White the luxury of winning with either 39. Qh4 or Qd4.

Apr-04-15  Howard: Thanks very, very much !

Now, if you could please look at a couple other games from that same match, where I posted similar inquiries.

Apr-04-15
Premium Chessgames Member
  thegoodanarchist: <Poulsen: <Zenchess><38. Nf5!! wins.>

Hmm - perhaps. ...

But what about 39.-,Kf8?. I may be blind here, but I don't see a clear win right away.>

Yes, you are right, you may be blind here. 38. Nf5! Nxf5 39. exf5 and now if 39...Kf8?? 40. fxg6 White is a rook up.

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