Dominoes spots from one to six are generally arranged as they are on six-sided dice, but because blank ends having no spots are used, seven faces are possible, allowing 28 unique pieces in a double-six set. However, this is a relatively small number especially when playing with more than four people, so many domino sets are "extended" by introducing ends with greater numbers of spots, which increases the number of unique combinations of ends and thus of pieces. Each progressively larger set increases the maximum number of pips on an end by three, so the common extended sets are double-nine, double-12,
Chinese dominoes Chinese dominoes Chinese dominoes are used in several tile-based games, namely, Tien Gow, Pai Gow, Tiu U and Kap Tai Shap. In Cantonese they are called "gwat pai" (), which literally means "bone tiles"; it is also the name of a northern Chinese game, where the rules are quite different from the southern Chinese version of Tien Gow. Ming author Xie Zhaozhe (1567–1624) records the legend of dominoes having been presented to Song Emperor Huizong in 1112. However the contemporary Li Qingzhao (1084 – ) made no mention of dominoes in her compendium of games. The oldest confirmed written mention