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It "behaves" like a normal poll.
When another choice is entered, the previous choice is cancelled

It was only working on beta.peakd.com. Now the updates are pushed to peakd.com - is it working for you?

Tested. Both choices were retained.

What will be the possibilities of use?
Will it be possible to "set" the maximum number of options for one user?

I am asking because in my polls for the Around The World photo contest I would like to "offer the jury" the opportunity to vote for a specific number of options (photos)

Yes, that is exactly how it works - you set the maximum number of choices that people can vote on. You can already do it from peakd.com when creating a poll.

Thanks for the reply. I will definitely try it on Saturday when creating another poll :-)