A form of rubber bridge that comprises sets of four deals (chukka) with pre- determined vulnerability.
On the first deal, neither side is vulnerable; on the fourth, both sides are.
On the other two deals one side is vulnerable, usually the dealing side.
Scoring is similar to rubber bridge but with bonuses for games replacing the rubber bonus. If a deal results in a pass out, the same player redeals.
Some play a variation, known as duplicate style Chicago; the procedure is the same as regular Chicago but duplicate style scoring applies: part scores attract an immediate bonus rather than carry forward to subsequent deals and honours do not count.
The benefit of playing Chicago is the known length of a chukka.