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3.Bc4 … 5...Nc6 6.d3 Nc5 7.O-O: Petrov Defense line
Petrov Defense line, 11 moves deep. You play Black.
e4
e5
Nf3
Nf6
Bc4
Nxe4
Qe2
d5
Bb3
Nc6
d3
Nc5
O-O
Nxb3
axb3
Bd6
Nc3
Be6
Nb5
O-O
Nxd6
Qxd6