Potential For Tactical Voting
Proportional representation systems are much less susceptible to tactical voting systems than single-winner systems such as the Single Member District Plurality ('First-Past-the-Post') system and Instant Run-Off Voting. Schulze STV has additional resistance to forms of tactical voting which are specific to single transferable voting methods.
However, all forms of STV are vulnerable to some degree of tactical voting because they lack monotonicity. This means that it is sometimes possible to benefit a candidate by ranking them lower than one's true order of preference, or to harm a candidate by ranking them higher.
PR-STV methods which make use of Meek's Method are resistant to Woodall Free Riding, but are still vulnerable to Hylland Free Riding. Schulze's method is not vulnerable to Hylland Free Riding, except where necessary in order to meet the Droop proportionality criterion.
A method which doesn't meet the Droop proportionality criterion has the potential to give disproportional results. Thus, Schulze STV can be considered invulnerable to Hylland Free Riding to as great an extent possible, subject to actually being a proportional representation method.
In addition to the voting system criteria passed by all STV methods, Schulze STV satisfies Dummett's Proportionality for Solid Coalitions criterion.
Read more about this topic: Schulze STV
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