This game is very well described here https://icebreakerideas.com/fun-games-to-play-at-home/#Dots_and_Boxes
- game begins with empty grid of dots
- players take turns at adding a horizontal or vertical line between two un-joined adjacent dots
- a player who completes the fourth side of a 1x1 box earns a point, writes their initials in the box and gets another turn.
- game is over when there are no more lines that can be placed
- winner is the player with most boxes
- the board can be of any size 2x2, 5x5 works well for experts
This has been implemented in sequential and concurrent Erlang.