Connect Four on the Klein bottle (4 gewinnt auf der Kleinschen Flasche)

This is a version of the famous boardgame Connect Four (Vier gewinnt) but played on the Klein bottle (Kleinsche Flasche).

The upper and lower boundary pieces of the game board are identified orientation preserving but the left and right boundary pieces are identified in such a way that the resulting surface is not orientable. More detailed rules and descriptions will follow.

Code by Hendrik Herrmann

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