Boxes

Boxes (aka Capture, Dots and Dashes)

Type: Abstract, Pen and Paper
Status: Public domain
BGG entry: http://www.boardgamegeek.com/game/17106
Available from: http://orion.math.iastate.edu/mathnight/activities/other/ppg/capture.shtml

Boxes is a two player game played on a grid of dots. The players take turns connecting dots that are horizontally or vertically adjacent. If a player can complete a square by connecting two dots then they capture that square. You must draw another line after making a capture. A player may, thus, make a large number of captures in a single turn. After the last capture he must still connect two dots.

Printable sheets are available here: http://www.amherstlodge.com/dirtycheats/fbg/downloads/games/boxes.htm