Light to move after 13 discs, with 0 columns already full.
Connect four within 4 of your own moves. Exactly one column starts the win; any other lets the opponent off.
What the position is about
- forcing sequence — The solution is a series of threats, each one leaving the defence a single answer.
- horizontal four — The four that wins lies flat, along one row.
Finding the way in
In four-move wins, track which spaces become playable after each forced block; the final double threat often appears two rows above where you start.
Take your time. There is no clock on the result, and a wrong move is simply taken back so you can look again.
Show the first move
Start with f3. Played out against the stiffest resistance, the whole line goes: f3 c3 c4 d4 g2 d5 g3.
Solve it and the next puzzle of the same game is one tap away. Your solved puzzles are ticked in the list, in this browser only.