Go is an abstract strategy board game for two players, in which the aim is to surround more territory than the opponent. The game was invented in China more than 2,500 years ago and is believed to be the oldest board game continuously played to the present day. As of mid-2008, there were well over 40 million Go players worldwide, the majority of them living in East Asia. As of December 2015, the International Go Federation has a total of 75 member countries and four Association Membership organizations in multiple countries.