Chicago Bridge is simply a way of playing to get instant scoring and without duplicating the hands.
The cards are cut to see who deals first and then each player deals in turn.
If you are just playing as a foursome then after 4 deals you just carry on repeating each set.
When playing as a foursome there are ways of combining Chicago with Rubber which I'll add in later
Each round consists of 4 deals
The contract is bid and played and scored exactly as Duplicate.
On the first hand nobody is vulnerable. The next two only the dealer is and on the 4th both pairs are and so the score is calculated on this basis
As a competition after each set of 4 deals East West moves to the next table and the whole process is repeated incuding cutting for deal and new hands are dealt.
Each pair keeps a record of the score on each hand and at the end totals it up.
The pair with the highest total is the winner
As simple as that.