Please format the error messages according to the Error style guide. Error strings should not start with a capital letter because they'll often be prefixed before printing. github.com/golang/go/wiki/Errors
The trySolve method name is confusing. A better name will be isSolvable or canBeSolved as it returns a boolean.
The trySolveRecursive method checks what the trySolvedoes in the beginning so you have code duplication.
I wasn't aware of the error message convention and I'll make sure to fix that up and adhere to it in future.
Regarding your other comments, I definitely agree the method naming there could be improved, and I'm also going to do a bit of refactoring to avoid the bit of duplication you mentioned.
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Criticisms - Cynicisms:
trySolvemethod name is confusing. A better name will beisSolvableorcanBeSolvedas it returns a boolean.trySolveRecursivemethod checks what thetrySolvedoes in the beginning so you have code duplication.Thanks for the feedback!
I wasn't aware of the error message convention and I'll make sure to fix that up and adhere to it in future.
Regarding your other comments, I definitely agree the method naming there could be improved, and I'm also going to do a bit of refactoring to avoid the bit of duplication you mentioned.