A 2-player game of whose origins I'm ignorant, played on any squared grid such as a chess board. It is also known as Critical Mass, as I discovered from a Google search, where it appears in the form of an examination question for aspiring AI programmers. I have played it on a board, but would not recommend that method as it involves an enormous amount of addition and removal of pieces which becomes remarkably tedious! As such, it is ideally suited to the computer. It's a neat idea, anyway.
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