 10 years later, Sherlock Holmes and Watson are called to investigate this unsolved case.Using the testimonies of the Duke's seven ex-wives and his knowledge of interval graphs, Holmes is able to determine which one made multiple visits to the Duke and was able to plant the bomb.Berge won the EURO Gold Medal from the Association of European Operational Research Societies in 1989, and (with Ronald Graham) the inaugural
Euler Medal from the Institute of Combinatorics and its Applications in 1993.