Treblecross

Treblecross is a degenerate tic-tac toe variant.

[5][1][3] Each player on their turn plays a piece in an unoccupied space.

The game is won if a player on their turn makes a line of three pieces (Xs or black chips) in a row.

Each player plays an X on the one-dimensional board in an empty cell.

The game is won when a player makes a row of three Xs.