e4/d4
c4
Nf3
f4
birb
b3
F4- In list of bad openings video B3- allows on active H1- A8 diagonal( G2 to D5 not illegal and capture free zone.
B3 I say
no B6
did you just say "1.f4" was in a list of bad openings video?
e4/d4
c4
Nf3
f4