contention
Contention is an abstract strategy game for two centering around the theme of containment and usurpation. The players work in tandem to encircle a rapidly growing mass, while at the same time planning their moves to force their opponent into a bad position.
Great fun, quick playtime (10-15 minutes at the absolute maximum, usually around 3-5 minutes), and challenging, subtle strategies.
Contention is available for free, as a complete print-and-play package including rules, pieces, and board in a single PDF. You may download a copy here: