Career
The 1952 Swiss Championship was an international tournament with eight Swiss players and six international players organized by Schachgesellschaft Zürich. Christoffel tied for second with Max Euwe (Netherlands), behind Erik Lundin (Sweden). In 1989, Christoffel became an International Master of Correspondence Chess (International Minerals and Chemical Corporation), and a Senior International Minerals and Chemical Corporation in 1990.
From 1987 to 1991, he was president of the Swiss Chess Federation.
He died in Rombach.