Strong Defensive Strategy Criterion (SDSC)

Statement of Criterion

If a majority prefers one particular candidate to another, then they should have a way of voting that will ensure that the other cannot win, without any member of that majority reversing a preference for one candidate over another or falsely voting two candidates equal.

Complying Methods

The Condorcet method complies with the Strong Defensive Strategy Criterion, but none of the other methods in the compliance table above comply.


Compliance with SDSC means that a majority never needs any more than truncation strategy to defeat a particular candidate, even when countering offensive order reversal by that candidate's voters. Offensive order reversal is the only strategy that can create the need for defensive strategy in a Condorcet voting system.