Hexxagon:

Hexxagon happens to be one of those games that's easier to play than it is to explain. You play as the red diamonds, and your goal is to take over the board by leaping into the spaces adjacent to your opponent's watery globules...

Hexxagon was an adaptation of the board game Othello written in 1992 by the now defunct Argo Games. My version is an almost identical recreation of the first level of that original game. Enjoy.