I don't see where anyone has defined Game Theory. To be helpful…
http://levine.sscnet.ucla.edu/General/whatis.htm
sott.net has several interesting articles encompassing Game Theory, sott.net and do a search for the word. This one is quite pertinent.
https://www.sott.net/article/242473-The-psychopaths-Game-theory-and-market-democracy
https://www.sott.net/