Which submission is used for private LB scoring?

good question!
If it would be 1., there would be an incentive to run many variations covering many potential distributions in the hope of one fitting best. So this seems bad.
2. seems plausible. But it has the danger that this submission is overfitted to the public leader board. It would incentivize not trying out many submissions.
3. seems best, but there is no feature currently where you can specify this.

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