This is dumb for one simple reason, It divides candidates based on an arbitrary line that has only limited correlation to the desired split: Those who fit your

This is dumb for one simple reason, It divides candidates based on an arbitrary line that has only limited correlation to the desired split: Those who fit your job requirements vs. those who do not. Instead, ask them to solve a pertinent problem to your company. If they go down the wrong path, give them a hint as to the right track and see how well they can grasp the new method. Simple. OR even better ask the candidate to explain how they solved their own last 'interesting' problem.