In mahjong, you need a good rapport with your partner across the table.
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culture
In mahjong, four seats are named by wind: 东 (east/dealer), 南, 西, 北. Your 对家 sits directly across; 上家 plays before you, 下家 after you. In bridge this is your partner; in 斗地主 there is no 对家 since it's a 3-player game.