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Competition rules. The game rules are not stated anywhere in the game, but your default rules, which are unfair to newcomers to Drivendata.
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Two test sets. Since all submissions have results on the two validation sets A and B, the two test sets have the same weight, and the B set cannot achieve the result of preventing overfitting as same as A. On the contrary, according to result B, it is more like overfitting.
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The distribution gap between the two test sets A and B. I feel that the organizer has not done any pre-experiments, and the data set is divided without considering the data distribution, which is irresponsible to any participant.
I hope the organizers can reconsider the unfairness and unreasonableness in the competition.
Hope there is an explanation before the results are announced.