Go (game)
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. 
A 2016 survey by the International Go Federation's 75 member nations found that there are over 46 million people worldwide who know how to play Go and over 20 million current players, the majority of whom live in East Asia.
Board wargame
The most recent of the major types of board wargame, it was created by the game "We the People" published by Avalon Hill in 1994. In most aspects it is much like a typical board wargame (on the simpler side of the spectrum), but play is driven by a deck of cards that both players draw from. These cards control "activation points", which allow the use of troops, as well as events that represent things outside the normal scope of the game. Newer card driven games have helped reinvigorate the war game genre as well as other differently themed games. "Twilight Struggle", a game based on the Cold War, was ranked #1 on the website BoardGameGeek from December 2010 to January 2016. As of September 2018, it's ranked fifth overall but first for wargames.