1
2
3
4
5
6
7
h8
g
f
e
d
c
b
a
4.Nc3 Bf5: the bishop comes out one tempo too early
Against 4.Nc3, you also play 4…Bf5 (145 games in the database). But the c1 bishop isn't locked in, and 5.cxd5 followed by 6.Qb3 hits b7 and d5 at the same time.
Recap: in the 8.Bd2 line, after 10.Qc2, which move?