imagine this: a round where there are no or only one test case. this would encourage hacking for lower rated participants and make people consider edge cases not presented to them. i believe regardless of your support for this idea, this is the direction we are heading after the latest global round c. just add hacks for a-d and the job is done. these contests could remain unrated but i believe it would be fun to have them rated. this could be even more interesting if it featured a communications problem.