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From the Vote Tally thread in Site Tutorials:
Edit: Quote got chopped off, should be fixed now.Instant Runoff
Instant Runoff voting separates each vote into blocks, using the same criteria as Division By Block above. Each block within each vote is then given a preference ranking. If no ranking was provided by the voter, then the top-most block is ranked 1, the second is ranked 2, and so on.
Alternatively, the voter may explicitly include their ranks in their votes by including the rank number in square brackets following the [x]. For example, an Instant Runoff Vote might look like:
[x] [2] Vote Melted Ice Cream and Pictures of Puppies
[x] [1] Vote Ice Cream and Puppies
[x] [3] Vote Styrofoam and Cardboard
Any votes not included in each voters post are automatically assumed to have been given the worst possible score by that voter.
When an Instant Runoff tally is run, the IRV Counting Procedure is performed to determine the winner of the vote:
- Eliminate the vote block appearing as the first preference on the fewest vote posts.
- If only one vote block remains, select this vote block as the winner and stop.
- Otherwise go to 1.
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