True. Trying to predict candidate's performance in such complex activity like programming by using a single source of info (competition results) is as effective

True. Trying to predict candidate's performance in such complex activity like programming by using a single source of info (competition results) is as effective as predicting if someone will be a good football player just by looking how fast he can run. Sure, it will affect the performance but it's not the only competence required. And not the most important either. That's why multi-angle approach is a must. Not to mention well defined competencies the company is looking for, which is often also a big problem.