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Tigran Vartanovich Petrosian vs Georgy Konstantinovich Borisenko
4th Soviet Team Cup (1964), Moscow URS, Oct-??
English Opening: Agincourt Defense. Keres Defense (A14)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
Aug-31-06  notyetagm: Petrosian exploits a nasty <LATERAL PIN> on the Black f6-pawn across the 6th rank with 34 ♘g5! fxg5 35 ♕b6-g6. Black has to resign just like that since he cannot meet the threat of ♕xg7#.

Another example of the danger of loose squares near your king that the enemy's pieces can coordinate on. The White queen's arrival on g6 coordinates with the White 7th-rank rook on the loose g7-square, creating a mate threat which Black cannot meet.

Since there was no Black f7- or h7-pawn to keep the White queen out of the g6-square by <DEFENDING> it, this task fell to the Black f6-pawn, which meets the threatened queen thrust by <BLOCKING> the 6th rank. The Black f6-pawn simply cannot both <BLOCK> the 6th-rank and <DEFEND> the g5-square, keeping the White f3-knight out.

Aug-31-06  notyetagm: Note that the defense 35 ... ♗d7 is refuted by 36 ♗d5+ ♔h8 (36 ... ♔f8 37 ♕f7#; 36 ... ♗e6 37 ♕xg7#;) 37 ♕xh5#.

35 ... ♗d7 36 ♗d5+:

36 ... ♔f8 37 ♕f7#
36 ... ♗e6 37 ♕xg7#
36 ... ♔h8 37 ♕xh5#

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