<div dir="ltr"><div class="gmail_extra">Ballots are ranked or rated. If ranked, then equal ranking and truncation are allowed.</div><div class="gmail_extra"> </div><div class="gmail_extra">Let IA stand for Implicit Approval, which for any candidate X is the number of ballots on which X is ranked or rated above bottom, i.e. neither truncated nor rated at zero.</div>
<div class="gmail_extra"> </div><div class="gmail_extra">Let MPO stand for maximum pairwise opposition, which (for candidate X) is the maximum (as Y varies over the other candidates) of the number of ballots on which a strict preference of Y over X is indicated.</div>
<div class="gmail_extra"> </div><div class="gmail_extra">The winner of this method (IA/MPO) is the candidate with the highest ratio of IA to MPO.</div><div class="gmail_extra"> </div><div class="gmail_extra">Example</div>
<div class="gmail_extra"> </div><div class="gmail_extra">45 A>B</div><div class="gmail_extra">35 B>C</div><div class="gmail_extra">20 C</div><div class="gmail_extra"> </div><div class="gmail_extra">For A IA is 45 and MPO is 55, so IA/MPO is 45/55 or 9/11.</div>
<div class="gmail_extra">For B IA is 80 and MPO is 45, so IA/MPO is 80/45 or 16/9.</div><div class="gmail_extra">For C IA is 55 and MPO is 80, so IA/MPO is 55/80 or 11/16.</div><div class="gmail_extra"> </div><div class="gmail_extra">
The IA/MPO winner is B.</div><div class="gmail_extra"> </div><div class="gmail_extra">If, instead, the A faction votes 45 A, then the ratios become ...</div><div class="gmail_extra"> </div><div class="gmail_extra">For A (the same) 9/11.</div>
<div class="gmail_extra">For B IA is 35 and MPO is still 45, so the ratio is 7/9.</div><div class="gmail_extra">For C IA is still 55 and MPO is 45, so the ratio is 11/9.</div><div class="gmail_extra"> </div><div class="gmail_extra">
This time C wins.</div><div class="gmail_extra"> </div></div>