Puzzle XL 2022 (2022-06-20)

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No Four in a Row

Author: Andrey Bogdanov

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Place either an ’X’ or an ’O’ into each empty cell such that four consecutive ’X’s or ’O’s do not appear horizontally, vertically or diagonally.

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Grid control: Click the mouse button at the selected cell to change the content of the cell. More details about grid control are at the help page.