No elimination IRV

No elimination IRV or no-elimination IRV is a variant of instant-runoff voting independently devised by Kevin Venzke and Bjarke Ebert.

It is slightly more resistant to strategy than ordinary IRV, mainly by having less pushover incentive. However, it is otherwise less monotone than IRV.

Procedure

1. The voter submits a ranking of the candidates. Truncation is allowed but equal-rank is not.
2. The method proceeds in a number of rounds, like IRV, and also keeps track of candidate statuses. Each candidate status may either be ordinary or "doubtful". Initially every candidate is ordinary.
3. On each ballot, starting from the top, the method gives one point to each candidate up to and including the first candidate that is ordinary (i.e. not doubtful).
4. If any candidate obtains more than 50% of the vote, that candidate is elected.
5. Otherwise, the ordinary candidate with the fewest votes is marked doubtful and the next round begins.

Step 4 may also include a clause that if the candidate with the most votes is the only non-doubtful candidate remaining, then he is elected. Kevin Venzke calls this variant "type 1" and the variant without, "type 2".

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