Edge template IV1a

The edge template IV-1-a
R4 C7 Sa1 Sb1 Sc1 Sd1 Ve1 Sg1 Sa2 Sb2 Sa3

Red has at least two threats involving the ziggurat: R4 C7 Sa1 Sb1 Sc1 Sd1 Ve1 Sg1 Sa2 Sb2 Pc2 Vd2 Sa3 Pb3 Pc3 Pd3 Pa4 Pb4 Pc4 Pd4 and

R4 C7 Sa1 Sb1 Sc1 Sd1 Ve1 Pf1 Sg1 Sa2 Sb2        Pe2 Vf2 Pg2 Sa3            Pe3 Pf3 Pg3 Pd4 Pe4 Pf4 Pg4

If Blue plays in the only common hex used in both threats. Then Red leads to edge template III1b.

R4 C7 Sa1 Sb1 Sc1 Sd1 Ve1 Sg1 Sa2 Sb2 Pd2 Ve2 Pf2 Sa3   Pc3 Pd3 Pe3 Pf3 Pb4 Pc4 Hd4 Pe4 Pf4