1.a1-g7!!
[ 1.g1-f2? g5-f4 2.c1xg5 h4xf6 3.a1xg7 h8xf6 x ]
1...h8xf6 2.g1-f2 f6-e5 3.f2-e3 g5xd2 4.c1xd6 2-0

created with Aurora Borealis 3.6