Twilight Struggle
"Twilight Struggle" was the highest-ranked game on BoardGameGeek from December 2010 to January 2016. As of August 2018, the board game occupies a fifth spot. Being released in 2005 it is the oldest board game in the overall top 10 ranking.
Chaturanga
Chaturanga (; ""), or "catur" for short, is an ancient Indian strategy game that is commonly theorized to be the common ancestor of the board games chess, "shogi", "sittuyin", "makruk", "xiangqi" and "janggi".