Light to move after 19 discs, with 0 columns already full.
Connect four within 2 of your own moves. Exactly one column starts the win; any other lets the opponent off.
What the position is about
- double threat — The key move creates two threats at once, and one reply cannot stop both.
- vertical four — The winning line runs straight up a column.
Finding the way in
Find the column that creates two winning spaces at once, or forces a block that sets up your second threat.
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 d5 f4.
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.