From: ShatteredElysium | #356
For example, If they made a change on one of the alt accounts after the last change on their main, it should override the main accounts pick just like it would for anyone else making a change.
The only advantage I could see from posting on an unknown alt is posting a change on the alt and then if it works out better going 'Oh, that account is my alt btw, I forgot to say'. And if it doesn't work out better, just saying nothing.
Yeah, I actually realized this was possible early in the contest. Not that I was considering using it, but that's the most obvious way you could use an alt to cheat.
The easiest way to avoid that would be, if you post a prediction with an alt and do not announce that it is yours before the start of the match, it's invalid.
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Connecticut Huskies