Chicago is a popular seven card stud variant. Basically, the game is played like seven card stud, except the person with the highest ranking spade in the hole wins half the pot. Basically, Chicago is played on five streets.
3rd street: Each person is dealt three cards, two cards in the hole (face down) and one exposed (face up). There is a round of betting.
4th street: An exposed card is dealt to each player, followed a round of betting.
5th street: An exposed card is dealt to each player, followed a round of betting. If the game is played in a fixed limit format, this is where the big bet would kick in.
6th street: An exposed card is dealt to each player, followed a round of betting.
7th street: Each player is dealt a final hole card, followed by the final round of betting. People then expose their hole cards, whoever has the highest poker hand wins half the pot, and whoever has the highest spade in the hole wins the other half of the pot. If no one has a spade in the hole, the person with the highest poker hand wins the whole pot.