Rin

Rin is an abstract board game played on a 16x16 grid. Two players, Black and White, take turns placing their own stones on the board and surrounding territory with rings. Black takes the first turn of the game. From then on, each player takes two turns in succession before the other player moves. The object of the game is to have the most territory (and hence most stones) when the board is full.

Rules:
http://blog.zmxv.com/2010/12/rin-abstract-strategy-game.html
Demo:
http://beta.appspot.com/rin/demo.html