Sincere favorite criterion

The sincere favorite or no favorite-betrayal criterion is a property of some voting systems that says voters should have no incentive to vote for someone else over their favorite. It protects voters from having to engage in lesser-evil voting or a strategy called "decapitation" (removing the "head" off a ballot).

Most rated voting systems, including score voting, satisfy the criterion.

Duverger's law says that systems vulnerable to this strategy will typically (though not always) develop two-party systems, as voters will abandon minor-party candidates to support stronger major-party candidates.

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