[EM] Minimal Tweak to make BTR-IRV Landau Efficient

Forest Simmons forest.simmons21 at gmail.com
Thu Apr 13 19:23:59 PDT 2023


To make sure BTR-IRV can never elect a covered candidate, use this tweak:

1. Let C be the pairwise loser of the matchup between the two (demaining)
candidates with the fewest transferred votes.
2. Eliminate C and every candidate covered by C if any exists.
3. Repeat steps 1 and 2 until there is an undefeated candidate among the
uneliminated ones ... and then elect that candidate.
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