Renju VCF #4996432 (5-move VCF)
To move: Black — find the move that forces a win by fours
Winning line
G8 → F8 → F7 → I10 → E6 → D5 → G6 → H5
Why this move works
The answer is G8. A five-move VCF that keeps White blocking forced fours (G8→F8→F7→I10→E6→D5).
The decisive G6 makes two winning points at once; White cannot cover both, and H5 completes five.