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Tigran Vartanovich Petrosian vs Martin Johansson Sr
Havana ol (Men) qual-A (1966), Havana CUB, rd 1, Oct-26
Sicilian Defense: Scheveningen. Classical Variation Paulsen Variation (B85)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
Feb-14-06  Resignation Trap: Let us establish the truth about this game. First, the identity of the player of the Black pieces is Martin Johansson Sr of Sweden, <<not>> Svein Johannessen of Norway.

This game was played in qualifying round one of the Havana Olympiad on October 26, 1966, and not in "Laatvia".

The http://www.chessgames.com database has two games: this one and Petrosian vs S Johannessen, 1966 , and the scores differ only with Black's 23rd move.

According to Petrosian's posthumously published book "Strategia Nadezhnosti", Black played 23...Ra8, which makes sense, since it stops further penetration of White's rook by 24.Ra7. 23...Ra8 is also given in "The Games of Tigran Petrosian" by Shekhtman.

By contrast, http://www.chessbase.com and http://www.olimpbase.org both give 23...Rd8, which would allow White to win with the simple 24.Bb6, picking up more material.

I believe we can safely conclude that Black actually played 23...Ra8, whereupon White cashed in with 24.Rxc6! Nxc6 25.Bb5! and Black resigned due to the dual threats of 26.Nd4 and 26.g6!

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