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3.Bc4 … 8...Bd6 9.Nc3 Qh6 10.g3: Petrov Defense line
Petrov Defense line, 12 moves deep. You play Black.
e4
e5
Nf3
Nf6
Bc4
Nxe4
Nxe5
d5
Qf3
Be6
Bb3
Qg5
Nd3
Nc6
O-O
Bd6
Nc3
Qh6
g3
Ng5
Qe2
Nd4
Qe3
Ndf3+