Go is a strategic boar game for two players. It is known as wéiqí in Chinese (Traditional: 圍棋; Simplified: 围棋), igo (囲碁, igo?) or go (碁, go?) in Japanese, and baduk in Korean (hangul: 바둑). To differentiate it from the common English verb go, it is frequently capitalized or spelled goe. Go originated in ancient China, centuries before its earliest known references in 4th century BC writing. It is mostly popular in East Asia but has nowadays gained some popularity in the rest of the world as well. Go is noted for being rich in strategic complexity despite its simple rules.