Renju VCF #4996345 (3-move VCF)
To move: Black — find the move that forces a win by fours
Winning line
G5 → G4 → H4 → K1
Why this move works
The answer is G5. The four forces White to block at G4.
Then H4 creates two winning points at once; White cannot defend both, and K1 makes five.