Tutorials

The following third-party tutorials may provide further insight into the game.

(ex) Expert Play in Connect-Four
James D. Allen describes "Joseki" (perfect) play in great detail.
(ex) A Knowledge-based Approach of Connect-Four (PDF)
This is the Master's Thesis by Victor Allis that announced his finding that the 7x6 board is a win for White.
(ex) 4 in a row Tutorial
by Martin Fierz
(ex) Connect Four Tutorial
by Giuliano Bertoletti
(ex) Connect Four - Wikipedia
The Wikipedia article on Four in a Row gives some mention to strategy and tactics.