Loom

An abstract game where the players place markers on a chess board in sequence, where they can only place makers that are horizontally or vertically in line with their existing marker(s) without interrupt by other markers, and not placed such that they are on any line between a pair of existing markers of the same color. Players are trying to form a box of their colour, or if they can't, have the longest lines of their color.

Full rules at: http://www.luchacabra.com/?p=57