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3.Nc3 … 6...Qxd5 7.Qe2 Bg4 8.h3: Petrov Defense line
Petrov Defense line, 9 moves deep. You play Black.
e4
e5
Nf3
Nf6
Nc3
Nc6
Bc4
Nxe4
Nxe4
d5
Bxd5
Qxd5
Qe2
Bg4
h3
Nd4
Nc3
Bxf3