9. (10 points) In the addition problem shown below, different Chinese characters can represent the same digit, making the equation true. Among all the equations that meet the requirements, what is the maximum value of the four-digit number Huabei Final?

将上面的文本翻译成英文，请保留源文本的换行和格式，直接输出翻译结果。
【Analysis】According to the problem, to maximize the value of the four-digit number "Huabei Final", the values of the two-digit addend and the three-digit addend should be minimized. The smallest two-digit addend is 10, and the smallest three-digit addend is 100. Therefore, the maximum value of the four-digit number "Huabei Final" is $2011-100-10=1901$.

【Solution】According to the problem analysis, the smallest two-digit addend is 10, and the smallest three-digit addend is 100. Therefore, the maximum value of the four-digit number "Huabei Final" is $2011-100-10=1901$.

Answer: The maximum value of the four-digit number "Huabei Final" is 1901.