I need to go and look this up again haha
You number your votes in order of preference instead of having one vote for one person, right? And the idea is that you might get 10 people vote the Red team as their first choice, then 9 people vote the Green team as their first choice, and 8 people vote the Blue team as first choice. So with first past the post, the Red team would win (I think) even though almost double the number of people who voted for them voted against them.
But under the new system, if everyone who voted the Red team and the Green team put the Blue team as their second choice, then the Blue team would win despite technically having the least number of 'first choice' votes.
Is that about right? I know it's something like that
I like the idea because it suggests that you can vote for who you like and
also who you would be happy with if they didn't get in, and then at least one of your choices stands a good chance of getting in. Whereas now, the party that gets in only has to get the majority, which might not reflect a good portion of the people who voted, so long as they just get past that marker.