To show the strategy of winning in Dots in action I put this small tutorial together. In 5 minutes I show three games of Dots and Boxes and how to win using the strategy of not taking all the boxes you can all the time. This is a pretty simple way to make sure you win every time you play.
My How to play and win video: • How to Play and Win in DOTS Every Time
To play online: https://www.math.ucla.edu/~tom/Games/...