Sheng ji is a family of point-based, trick-taking card games played in China and in Chinese immigrant communities. They have a dynamic trump, i.e., which cards are trump changes every round. As these games are played over a wide area with no standardization, rules vary widely from region to region. The game can be played with multiple decks of cards. With one deck, it may be called dǎ bǎi fēn (打百分, 'competing for a hundred points') or sìshí fēn (四十分, 'forty points'); with two decks, as is most commonly played, it may be called bāshí fēn (八十分, 'eighty points'), tuō lā jī (拖拉機, 'tractor'), shuāng kōu (雙摳, 'double digging out'), or shuāng shēng (雙升, 'double upgrade'); with three decks, it may be called zhǎo péngyǒu (找朋友, 'looking For friends'). The article below mainly describes the bashi fen variant, with players playing with two decks and in fixed partnerships.