Until the mid-1700s, a client would have to go an ageya (house of assignation) to try to arrange a liasion with a tayû, the highest rank ever given to a courtesan. Tayû effectively disappeared as a rank in 1761 when the last legitimate one, Hanamurasaki, appeared listed in the New Year saiken. In the pre-1761 system of rankings of courtesans and prostitutes, tayû (whose price ranged between 1 to 1.5 ryô or about $250-$450) was followed by kôshi (high class courtesans at about 1 ryô), then sancha (mid-class at 0.25 to 0.5 ryô), tsubone (low-class prostitutes at less than 0.10 ryô), and finally hashi (the lowest class of prostitute available for about 1/50th to 1/100th the price of a tayû). The number and variety of illegal prostitutes working throughout Edo shot up during the 1700s, posing competition to the Yoshiwara. They ranged from "gold cats" on the high end to low-class "boat tarts" and open-air "night hawks."