def check_legal(self):
        div = int(math.sqrt(self.BoardSize))
        for x in range(0,div):
            for i in range(0,div):
                j=self.CurrentGameBoard[x][i]
                for k in range(0,div):
                    if (j==self.CurrentGameBoard[x][k] and k!=i):
                        return false
        for x in range(0,div):
            for i in range(0,div):
                j=self.CurrentGameBoard[i][x]
                for k in range(0,div):
                    if (j==self.CurrentGameBoard[k][x] and k!=i):
                        return false