VCF (Victory by Continuous Fours) is the cleanest kill in Gomoku: every move you play makes a four, every four forces the opponent's reply, and the last four makes five — the opponent never gets a free move, so the win is proven, not hoped for. It begins with the simplest case: black's row-7 three sits in an open line, and one point turns it into an OPEN four — two ways to five, one defender; white holds one end, black takes the other. Land that one-move kill yourself: extend the three into an open four — a four with both ways to five still free.
Solve the remaining tasks to finish this lesson.