Tex

Tex is a drawless connection game for two players: Red and Blue. It is played with trapezium-shaped pieces on the spaces of an initially empty, loosely square grid. The top and bottom edges of the board are colored red; the left and right edges are colored blue. Two pieces are point-adjacent if they share nothing more than a vertex, and edge-adjacent if they share an edge segment longer than a vertex. Red plays first, then turns alternate. On your turn, place a piece of your color on an empty space. After your placement, for any two point-adjacent pieces of your color there must be another piece of your color edge-adjacent to both. You win if there is a chain of edge-adjacent pieces of your color touching the two opposite board edges of your color. To make the game fair, Blue will have the option, on their first turn only, to swap sides with Blue instead of making a regular move. —description from the designer