Mastermind is a two players zero sum game of imperfect information. Starting with Erdos and Rényi (1963), its combinatorics have been studied to date by several authors, e.g., Knuth (1977), Chvátal (1983), Goodrich (2009). The first player, called “codemaker”, chooses a secret code and the...

We consider a committee voting setup with two rounds of voting where committee members who possess private information about the state of the world have to make a binary decision. We investigate incentives for truthful revelation of their information in the first voting period. Coughlan (2000)...