Jostle is a combinatorial game (i.e. two player, perfect info, etc.), which uses a 10x10 square grid, 16 red checkers and 16 blue checkers, as shown in the figure. On your turn you move one of your checkers to an unoccupied, orthogonally adjacent square, subject to the following. The value of a checker is its number of friendly orthogonal adjacencies minus its number of enemy orthogonal adjacencies. You can only move a checker when you increase the moved checker's value. The last player to move wins. I.e. if you don't have a move on your turn, you lose.

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