Advanced Tactics Gold is a major revision of old Advanced Tactics. All scenarios and saved games from old Advanced Tactics are loadable by Advanced Tactics Gold game.
Advanced Tactics Gold extends the Advanced Tactics game into new territories like alliances and resources. Also the game interface has been redone and a full new graphics set has been added. Advanced Tactics Gold was released in early april 2011.
Advanced Tactics Gold won the Wargame of the Year 2011 Silver Award (editors choice) on the Wargamer.com.
To buy the game or to get more info check the Matrix Games product page.
Furhermore you can check the most recent version of the rules on the wiki.