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3.Nc3 … 8...O-O 9.Re1 f5 10.Bd2: Petrov Defense line
Petrov Defense line, 10 moves deep. You play Black.
e4
e5
Nf3
Nf6
Nc3
Nc6
d3
d5
exd5
Nxd5
Be2
Nxc3
bxc3
Bd6
O-O
O-O
Re1
f5
Bd2
Qf6