Monte Carlo, 1968

Botvinnik vs Portisch

A rook taken on c7 that cannot be taken back, and a second rook follows it in.

r n . q r b k .
. p p . . p p p
. . . . . . . .
p . . b p . . .
Q . . . . . . .
P . . P B N P .
. P R . P P B P
. . R . . . K .

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