Suggestion by Tideman: “Bottom Two Elimination Runoff”

Tideman suggests a Condorcetcompliant version of IRV, where the bottom two least (top)preferred candidates undergo a majoritarian preference runoff, with the loser being eliminated and the process repeating. This complies with the Smith criterion as well, I’m not sure what other criteria it satisfies (ex: I doubt it is monotonic, although it does seem to have more resistance to producing nonmonotonic results than IRVcould it be monotonic?) but I thought it was an interesting concept. I think with exact ties, quasi/weakCondorcet winners can still be eliminated which is potentially problematic, but I like the idea of this method because it can be used to shrink large candidate pools to any desired size in a simple and consistent way.
Here is an example with three candidates and a comparison with the results of other methods:
7: A>B>C
6: B>C>A
2: C>A>BIn this case, there is no Condorcet winner. This new method by Tideman, his older method Ranked Pairs, IRV, Dodgson and Young voting all agree with the ranking A>B>C.
A and B are both Bucklin winners, so depending on how a singlewinner is chosen it could give A>B>C or B>A>C. Black voting (AKA Condorcet/Borda) on the other hand ranks B>A>C.
An argument against the ranking B>A>C is that if C were removed, A would beat B, meaning that using Black voting has made C a spoiler for A. In any case it isn't actually clear which ranking is preferable, the ambiguity is related to the independence of irrelevant alternatives criterion.

@cfrank Will just note that Nobel laureate Eric Maskin recently also endorsed BTR at his recent talk this summer at a conference at Columbia in How to improve rankedchoice voting and democracy
Generally speaking, he endorses any kind of Condorcet method; for a while he and another worldclass economist had together written some essays proposing what is essentially Copeland//Borda (now rebranded by EVC as Ranked Robin)

@cfrank Not long ago I posted this, I assume we are talking about the same thing? I usually call it BTR. Tldr: I like it.
https://www.votingtheory.org/forum/topic/230/bottomtworunoffcondorcetirvhybrid