Trapezoid

The mouth is a group with a wide base.

R5 C5 Vc2 Vd2 Vb4 Vd4

Gaining Ground
R6 C7 Ve2 Vf2 Hc4 Hd5 R6 C7 Ve2 Vf2 Hc4 Hd5  Vd4 Hc5 Vf4

Ladder Escapes
R6 C10 Ve2 Vf2 Vd4 Vf4 Vg4 Vh4 He5 Hf5 Hg5 Hh5