SIMULTANA 

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The game starts in 5x5 square board with the following setup:

 

MOVE - Each player moves one of his stones orthogonally respecting the following restriction: The moved Black stone must create at least one adjacent area of 3 or 5 empty cells. The moved White stone must create at least one adjacent area of 2 or 4 empty cells. GOAL - The first player unable to make a move, loses.

 

An example Black moves from a1 to cell [1] and wins, since White is stalemated! Moving a1 to c1 is valid, since it creates a 3 cell area (a2-a1-b1).