Title: Hansen, Perry and Slate at 1st World Computer Chess Championship in Stockholm Photographer: Newborn, Monroe Size: 311 KB Date: 1974 Credit Line: Gift of Monroe Newborn Accession: 102645354				From left, Russel Hansen and Jim Parry from the University of Waterloo. Their "Ribbit" program competed against Northwestern University's David Slate (Chess 4.0), at the 1st World Computer Chess Championship.> > In 1974, Kaissa won all four games at the First World Computer Chess Championship. The World Computer Chess Championship is held every three years.