I think a good interview process would involve suggesting that the solution as given does not meet that interpretation of requirements, and asking the candidate

I think a good interview process would involve suggesting that the solution as given does not meet that interpretation of requirements, and asking the candidate to discuss/adjust, as you suggest. A poor process would fail the candidate outright without discussion or explanation. You’ll notice, for example, that Christine asking him to try out his code while she reads out the moves doesn’t match the template she provided, either. JM2C.