Hay voting

Hay voting is a single-seat nondeterministic cardinal voting system designed by Peter de Blanc.

Its characteristic feature is that if the voters use optimal strategy, then it's possible to infer their utility functions (how much utility they judge they will get if a candidate wins), up to an affine transformation. However, the method is nondeterministic and does not have very good Bayesian regret, which leaves it somewhat lacking for practical use. In addition, it fails the independence of clones criterion.