Edge template IV1b

The edge template IVb
R4 C8 Sa1 Sb1 Sc1 Sd1  Vf1  Sh1 Sa2 Sb2 Sa3          Se3

Red has two threats using template III-1-a:

R4 C8 Sa1 Sb1 Sc1 Sd1 Pe1 Vf1    Sh1 Sa2 Sb2 Pc2 Vd2 Pe2 Sa3 Pb3 Pc3 Pd3 Se3 Pa4 Pb4 Pc4 Pd4 and

R4 C8 Sa1 Sb1 Sc1 Sd1    Vf1 Pg1 Sh1 Sa2 Sb2            Pf2 Vg2 Ph2 Sa3            Se3 Pf3 Pg3 Ph3 Pe4 Pf4 Pg4 Ph4 These moves lead to easy direct connection. Because there is no common hex used in both threats, Blue cannot prevent Red to link to the bottom.