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3.Bc4 Nxe4 4.Qe2 d5 5.Bd3: Petrov Defense line
Petrov Defense line, 10 moves deep. You play Black.
e4
e5
Nf3
Nf6
Bc4
Nxe4
Qe2
d5
Bd3
Bd6
Bxe4
dxe4
Qxe4
Nc6
O-O
O-O
d3
f5
Qd5+
Kh8