Furikawari is a Japanese go term meaning an exchange of potential territories. It is frequently used to describe situations where potential territory is exchanged for influence or two territories are exchanged, and usually involves sacrifices and squeeze plays. In English, the term is often translated, simply, as exchange.
Many types of furikawari can occur in real games. For example, a player may sacrifice territory on the side to gain territory in the opponent's corner. In another example, a player invading a large framework may live inside, but at the cost of the opponent building-up large influence. Thus, a furikawari may occur between two territories, between two influences, or between territory and influence.
The key to successfully using furikawari is to use them to maintain territorial and influential balance.
After at a the exchange of for a deep framework comprising the whole top left is complete.
After , trades the corner for a position on the left side and cutting off the stones on the top side.
A huge furikawari was seen in Sakata (7p, White) against Takagawa (7p, Black) in the 1952 Honinbo Challenger Playoff. Takagawa, the underdog in this game, allowed a huge right-side moyo to be killed, in return for taking the left side. He was about 20 points ahead when Sakata resigned. This brilliant game enabled Takagawa to challenge for the Honinbo title, the start of his famous series of nine wins in a row.