DON’T GET CROSS IF IT ENDS IN NOUGHT

A Noughts and Crosses puzzle consists of a square grid in which some of the squares are blacked out in the manner of a crossword puzzle. Some of the remaining squares contain either an X or a O. To solve such a puzzle, the solver must place an X or a O into each of the remaining squares in such a way that there are never three Xs (XXX) or three Os (OOO) in line, either horizontally, vertically or diagonally.