Find a Flaw in the logic!! I had a captcha value "ex0888" and the answer for the chess puzzle was Rd8+. Now I can not statisfy the Rule "digit sum adds up to n

Find a Flaw in the logic!! I had a captcha value "ex0888" and the answer for the chess puzzle was Rd8+. Now I can not statisfy the Rule "digit sum adds up to number 25" cause total of all the digits in password was exceeding the 25. Can't go ahead of this! But It was fun playing and keeping up all the rules!