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In the real world, a certain percentage of votes received by the Greens are already 'tactical votes' by those who voted SNP in constituencies.
https://twitter.com/ListVoteSense/status/1300117500701663233Well if list party devotees can indulge in 'fantasy politics', let's try some of our own.
Their whole shtick is based on the fantasy they'll be at 7-8% of the list vote in 2021, taking 'just' 15% or 20% of the SNP vote - 170k votes on current polling, ahead of the LibDems. 
https://twitter.com/citizentommy/status/1298281241238700035To state that the SNP can’t win any more list seats is false: if it’s percentage goes up, so will the list seats: the reason there were only 4 in 2016 was because the list was 5% below the constituency %. If they matched, the SNP would have doubled it’s list seats.
The runaway election success will apparently be driven on the back of a poll showing that voters would be attracted to a party led by Alex Salmond (the SIRP bit being utterly irrelevant, sorry).
Some examples here of the list votes from 2016. The algorithm simply awards the seat to the party with the highest vote in that round. It doesn't distinguish between indy and unionist.https://twitter.com/ListVoteSense/status/1289348922025050112?s=20
https://twitter.com/Yes_Perth_City/status/1289863007812583424Dr Craig Dalzell provides an interesting synopsis of the history of electoral systems used in Scotland, with the pros and cons of each: from the easy, but unproportional First Past The Post, to the Additional Member System (AMS) used for elections to the Scottish Parliament.
Let's indulge ourselves with a bit of modelling to see effect on outcome predicted by latest Panelbase poll for the South of Scotland.
We are told that the ISP isn't planning to stand candidates in the South of Scotland list, because in 2016 the SNP won three of its four list seats there.

The cultish paranoia is such that proponents of indy list parties refuse even to engage with evidence.