A tough classic. The first card sets the base rank of the four foundations, which build up wrapping around (Ace follows King). A 13-card reserve feeds the game.
Canfield is named after Richard A. Canfield, who ran a casino in Saratoga Springs (USA) in the late 19th century. The story goes that he sold a deck for $50 and paid $5 for every card a player managed to get to the foundations — a house gambling game, with the edge kept by the casino, since almost nobody cleared the table.
That betting origin is exactly why Canfield is famous for being hard: the win rate is low and every deal is a small challenge. The first card sets the base of the foundations, which build up wrapping around (Ace follows King).
It is one of the classics that helped popularize patience games in the United States and influenced many modern reserve-based solitaires.