IRV is not immune to tactical voting https://en.wikipedia.org/wiki/Instant-runoff_voting#Resistance_to_tactical_votin...
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True. But still, regular first past the vote doesn't come in close with its tactical voting. Also, the quantity of votes makes it a bit of an hassle. And jam options cannot be categorized into Left-Centre-Right aswell. So, lets just hope that malicious anons don't have several days of dedication of crunch the numbers.