Runoff vs IRO

[Bart Ingles]

Example 1:

32 Liberal
35 Centrist
33 Conservative

Runoff/IRO:  Liberal loses, votes shift to centrist; centrist wins.
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Example 2:

A second centrist enters the race and splits the vote

32 Liberal
23 Centrist
12 Centrist2
33 Conservative

Runoff:  Both centrists lose, either liberal or conservative wins.
IRO:  Centrist wins.