Go ahead and provide an answer.
The Petrov Defense with a C6 twist
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I need an answer.
I'm getting a sense of reluctance here.
It's usually played in the Marshall variation of the Petroff.
https://old.chesstempo.com/gamedb/opening/1548
Should the Petrov Defense ever contain the pawn move c6? Or is it a forbidden move in the Petrov Defense?