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3.Nc3 … 5...d5 6.Bxd5 Qxd5 7.Nc3: Petrov Defense line
Petrov Defense line, 10 moves deep. You play Black.
e4
e5
Nf3
Nf6
Nc3
Nc6
Bc4
Nxe4
Nxe4
d5
Bxd5
Qxd5
Nc3
Qd6
O-O
Bg4
h3
Bh5
d3
O-O-O