8
7
6
5
4
3
2
a1
b
c
d
e
f
g
h
The bishop on f5: your Qb3 walks into the pin

Same start, but 5…Bf5 instead of 5…Bg4: 14 games, 36%. After 8.Qb3 Bb4, 7 games, 0%. It's the biggest leak in this family.

Recap: why was 7.Qb3 good against …Bg4?