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Shimon Kagan vs Tigran Petrosian
Rio de Janeiro Interzonal (1979), Rio de Janeiro BRA, rd 15, Oct-12
Sicilian Defense: Scheveningen Variation. Keres Attack (B81)  ·  0-1

8
7
6
5
4
3
2
a
1
b
c
d
e
f
g
h
White to move.
ANALYSIS [x]
0-1

rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
FEN COPIED

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Kibitzer's Corner
Apr-23-06  GarryBonaparte: A Kere's with Black's QN correctly
placed this time, rather than on
c5, as in G. 93 against Polugaevsky.

10 Rg1? This certainly wasn't needed
to enforce g5, which he's already played. And if he wants to later play f5, why play this move?

10 Bh3! and then f4 and f5.

13...the 'bane of the Velimirovic is
reached, only with a lot of wasted
moves by White popped in. That's why he begins losing.

Apr-23-06  ButIdothattoo: Uh...I'm getting a really strong
sense that you understand quite a
bit about Chess now, and just need
to come back and deliver the punishment, rather than blabbing all the secrets away. Otherwise, you might find your opponents thoroughly
stocked up when you do finally return.
But thanx for the cornbread, man.
Apr-03-14
Premium Chessgames Member
  Tabanus: <ButIdothattoo> In case you return, White lost on time according to the tournament book.
Oct-21-21
Premium Chessgames Member
  kingscrusher: It seems White had to play 19.a3 - an essential move. I know Fischer has commented on this move in the 60 memorable games book. but here it acts as an encouragement for "self-deflection" away from the e5 square, if black indulges in Nxa3

Shimon Kagan - Tigran Vartanovich Petrosian 0-1 15.0, Rio de Janeiro Interzonal 1979


click for larger view

Analysis by Stockfish 14:

1. ± (0.75): 19.a3 b4 20.axb4 e5 21.Nd5 Qb7 22.Nc6 Qxc6 23.Ne7+ Bxe7 24.fxe7 Bg4 25.exf8Q+ Rxf8 26.b3 Nxe3 27.Qxe3 Bxd1 28.Rxd1 Rc8

In the game because 19.a3 was committed black got huge counterplay

Oct-21-21
Premium Chessgames Member
  kingscrusher: Just to clarify a bit further, if 19.a3 Nxa3, White has e5 :

Shimon Kagan - Tigran Vartanovich Petrosian 0-1 15.0, Rio de Janeiro Interzonal 1979


click for larger view

Analysis by Stockfish 14:

1. +- (2.40): 20...dxe5 21.Nb3 b4 22.Bc5 bxc3 23.bxa3 Bb7 24.h5 Be4 25.hxg6 fxg6 26.Bd6 Qf7 27.Bxf8 Qxf8 28.Nc5

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