private boolean isAWinningMove(int column, int row, char playerID)
    {
        return isAWinningColumn(column, playerID) || isAWinningRow(row, playerID) || isAWinningD1(column, row, playerID) || isAWinningD2(column, row, playerID);
    }

    private boolean isAWinningColumn(int column, char playerID)
    {
        int number = 0;

        for (int i = 0; i < tab[column].length; ++i)
        {
            if (tab[column][i] == playerID)
                ++number;
            else
                number = 0;

            if (number >= 4)
                return true;
        }

        return false;
    }

    private boolean isAWinningRow(int row, char playerID)
    {
        int number = 0;

        for (int i = 0; i < tab.length; ++i)
        {
            if (tab[i][row] == playerID)
                ++number;
            else
                number = 0;

            if (number >= 4)
                return true;
        }

        return false;
    }

    private boolean isAWinningD1(int column, int row, char playerID)
    {
        for ( ; column > 0 && row > 0; --column, --row) {}

        int number = 0;

        for (int i = 0; column + i < tab.length && row + i < tab[0].length; ++i)
        {
            if (tab[column+i][row+i] == playerID)
                ++number;
            else
                number = 0;

            if (number >= 4)
                return true;
        }

        return false;
    }

    private boolean isAWinningD2(int column, int row, char playerID)
    {
        for ( ; column < tab.length && row > 0; ++column, --row) {}

        int number = 0;

        for (int i = 0; column - i >= 0 && row + i < tab[0].length; ++i)
        {
            if (tab[column-i][row+i] == playerID)
                ++number;
            else
                number = 0;

            if (number >= 4)
                return true;
        }

        return false;
    }