FpA-fpC

fpA-fpC (for first preference A minus first preference C) is a three-candidate Condorcet method based on first preference Copeland. Its election cases are:

• If there's a Condorcet winner, then that candidate wins.
• If the Smith set is size two, then the winner is according to majority rule.
• If the Smith set is size three, then for each candidate, assume without loss of generality that the candidate is A in an A>B>C>A cycle. A's score is A's first preferences minus C's first preferences. The candidate with the highest score wins.

This method shares the strategy resistance of Smith-IRV hybrids, such as chicken dilemma compliance and dominant mutual third burial resistance; yet, unlike them, is monotone. It is open (not obvious) how to extend the method to more than three candidates in a way that retains both monotonicity and strategy resistance.

It produces similar results to Condorcet,IFPP.

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References

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This is a list of emails to the EM-list, originally compiled by User:Kristomun in a comment on the "Talk:" page for this article, but possibly augmented by others after February 2022:

• "Strategy-resistant monotone methods" 2016-02-07 (User:Kristomun)
• "Re: MJ -- The easiest method to 'tolerate'" 2016-09-22 (User:Kristomun)
• "Resolvable weighted positional systems all fail independence of clones" 2017-12-03 (User:Kristomun)
• "Fwd: What are some simple methods that accomplish the following conditions?" 2019-06-01 (Forest Simmons)
• "Re: Improved Copeland" 2019-06-07 (User:Kristomun, also Forest Simmons)
• "Unmanipulable majority and Condorcet" 2020-01-03 (User:Kristomun, also Forest Simmons)
• "Minimally manipulable methods: preliminary results" 2020-11-02 (User:Kristomun; first post about the MIP minimally manipulable method search)
• "Re: A Metric for Issue/Candidate Space" 2020-12-23 (Kevin Venzke)
• "Re: Best Ranked Preference Deterministic Method?" 2020-12-24 (User:Kristomun, KV, FS)
• "Re: extending fpA-fpC" 2020-12-26 (Kevin Venzke)
• "Re: Agenda Based Banks" 2021-08-04 (Forest Simmons)
• "Re: Defeat Strength Demystified" 2021-09-17 (Forest Simmons)
• "Re: 'Independence of cycles' and a possible new method" 2021-12-12 (User:Kristomun, Toby Pereira, Colin Champion, Forest Simmons)
• "Re: Quick and Clean Burial Resistant Smith, compromise" 2022-01-09 (User:Kristomun, Kevin Venzke, Daniel Carrera, Forest Simmons)