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MAINLINE
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Safe King: Counter the Vienna Gambit line
e4
e5
Nc3
Nf6
f4
d5
fxe5
Nxe4
Nf3
Bc5
d4
Bb4
Bd2
c5
Nxe4
dxe4
Bxb4
cxb4
Ng1
O-O