Rules are very simple! you are trying to make a straight line with your three pieces. First player puts a piece on the board at one of the nine positions where lines join. Second player does the same – try to stop the first player making a row!
By now, either one person has made a row of three or neither have. If neither have, the first player can now move any of their pieces to an adjacent (next-door – in any direction!) empty position. Each player taking a turn to move any piece to an empty adjacent position, until someone succeeds!