Extrusion is a drawless territory game for two players: Black and White. It is played on the spaces (cells) of an initially empty hexagonal grid of hexagons (board). A clump is a stone along with all stones one can reach from it through a series of steps onto adjacent stones. A checkered ribbon is a clump with no stone adjacent to a like-colored stone, no stone adjacent to more than two stones and exactly one or two stones, both of the same color, adjacent to less than two stones. Black starts by placing a black stone on any cell, then players take turns placing exactly two stones of their color on empty cells. At the end of your turn, all clumps must be checkered ribbons. Passing is not allowed, but, if you cannot place two stones, your turn is skipped. When neither player can place two stones, the player with the higher score wins. Your score is the total number of stones in all checkered ribbons with more friendly than enemy stones. Variants Free: Ribbons are not required to be checkered, i.e. stones of the same color can be adjacent to each other. This is still drawless because the total number of stones on the board is always odd. Odd: Ribbons are not required to be checkered, but they are required to have an odd number of stones. Palindromist: Ribbons are not required to be checkered, but their first stone must be the same color as their last, their second stone must be the same color as their second-last, etc. This variant was suggested by Dale Walton. —description from the designer

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