8
7
6
5
4
3
2
a1
b
c
d
e
f
g
h
4…Qb6 straight away: Nc3 and the c7 square
When the black queen comes out before the b8 knight, you score 23% over 11 games: your worst position in the family. Your 5.Nc3 is the right move; it's what comes next that you're missing.
Recall: after 5.c3 Qb6, where does your queen go?