Puzzle 1. Black to move: row 7 holds the broken three (5,7), (6,7), (8,7) and column 6 holds the pair (6,6), (6,8) — and the hole and the pair meet at one point. Find it: the move makes a rush four AND an open three, and white may answer only one. The four-three again — the VCF's favorite opening move.
Finish this step to move on.