Light to move after 17 discs, with 1 column already full.
Connect four within 3 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.
- diagonal four — The winning line runs on a diagonal, the hardest kind to see.
Finding the way in
Three-move wins usually start with a forcing move: a threat the opponent has to block, after which your next disc makes a double 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 d3. Played out against the stiffest resistance, the whole line goes: d3 d4 c4 d5 b5.
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.