Renju VCF #4996511 (7-move VCF)
To move: Black — find the move that forces a win by fours
Winning line
G9 → I9 → D9 → E9 → F7 → E8 → F5 → F6 → F2 → F1 → E6 → D5
Why this move works
The answer is G9. From G9 you chain forcing fours to keep White defending — a seven-move VCF (G9→I9→D9→E9→F7→E8→F5→F6→F2→F1).
The decisive E6 makes two winning points at once; White cannot block both, and D5 completes five.