The Chicago Sister Cities International Cup (CSCI Cup) is an annual four-day pre-season football tournament held at Toyota Park in Bridgeview, Illinois - a Chicago suburb. It is similar in style to the Amsterdam Tournament held by Ajax, and is hosted by the MLS club Chicago Fire. The inaugural tournament took place in late May 2010. The tournament involves 4 teams including Chicago Fire and has 4 matches, all played at the Fire's Toyota Park. The games take place over 4 days in May or June.