  Schulze voting is a recently introduced voting system enjoying unusual
popularity and a high degree of real-world use, with users including the
Wikimedia foundation, several branches of the Pirate Party, and MTV. It is a
Condorcet voting system that determines the winners of an election using
information about paths in a graph representation of the election. We resolve
the complexity of many electoral control cases for Schulze voting. We find that
it falls short of the best known voting systems in terms of control resistance,
demonstrating vulnerabilities of concern to some prospective users of the
system.
