This competition allowed submissions to include extra data files that can be used by the model. The cheaters added a file with data from another website that se

This competition allowed submissions to include extra data files that can be used by the model. The cheaters added a file with data from another website that seemed innocent, but secretly encoded extra information (perfect answers) in IDs. For 10% of predictions, the code via a set of obfuscated operation retrieved this information and presented it as the answer.