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TacTix is a two-player strategy game invented by Piet Hein, a poet well known for dabbling in math and science. Players take turns to remove any number of contiguous pieces from a grid of playing pieces, alternating until the last piece is removed.
The game can be played in its misere and non-misere forms. The strategies listed here render the non-misere gameplay trivial. At the time of its founding, TacTix was played on a 6x6 board, but is now usually played on a 4x4 board. TacTix is essentially a two-dimensional version of Nim.

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