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Viktor Korchnoi vs Tigran Vartanovich Petrosian
Petrosian - Korchnoi Candidates Semifinal (1971), Moscow URS, rd 4, Jul-10
Bogo-Indian Defense: Nimzowitsch Variation (E11)  ·  1/2-1/2


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Kibitzer's Corner
Apr-02-15  Howard: Wonder if Korchnoi might have missed a win here.
Apr-03-15  Retireborn: <Howard> According to my notes (compied from a contemporaneous source long since thrown away!) 26.Rc3 lets the advantage slip after 26...Rg8! Instead either 26.Kh1 or 26.f5 keeps a big advantage for White.

After 26.Rc3 Rg8! White cannot play 27.Kh1 because of 27...Rxg2 28.Kxg2 Bxd5+ 29.Qxd5 Nf4+. In contrast, after 26.Kh1 Rg8 White has 27.Bf3.

Premium Chessgames Member
  offramp: White has just played 21.gxf4.

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Black now played 21...a5.
I wonder how long Petrosian thought about playing 21...Nxd5? It is quite a forcing line. Can you visualise it?

21... Nxd5 22. cxd5 Nxf4 23. dxc6 Rxe2 24. Rxf4 Qxf4 25. Qxe2 Qxc1+ 26. Qe1 Qxe1+ 27. Bxe1 bxc6 28. Bxc6.

If you have this position in your mind,

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Score 10 points.

After 25...Ba8,

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Kortschnoi played 26.Rc3. He could have played 26.f5. He may have calculated as far as he could and failed to see a crucial and difficult move. After 26.f5 Ng5 27.Rxc7 Qh5 28.Kh1 Rxe2

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29.Re7! is the only winner. Tough to see.

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