I'n not sure about changing rule #32 (again). In the past we played rounds where I was allowed to have "secret" test cases to test the code against. However, we changed that and ultimately ended up with rule #32.

On the other hand, one should be able to add additional test cases that validate certain rules or assumptions to be made for the challenge. That would then change the rule to allow the addition of new test cases, maybe limited to prior of the final scoring of the private round. This would then prevent somebody from holding back new test cases in order to alter the results of the private round. Comments are welcome.
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There are two types of vessels, submarines and targets.