Correction 

I wrote:

Note that the strategy of major parties crowding the centre seems to be
equally applicable to Condorcet, IRV, Borda & Approval, with Demorep's
YES/NO system being slightly worse, and plurality slightly better.

I meant:

Note that the strategy of major parties crowding the centre seems to be
equally applicable to Condorcet, Borda & Approval, with Demorep's YES/NO
system being slightly worse, and *IRV and plurality being slightly better*.

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