In computerised version of board games, player satisfaction can be augmented by providing explanation of what the computer based AI analytical processes are. This helps the players to understand the reasoning behind the action taken by the computer AI opponent. This paper proposes a method that provides the mechanism for a game AI to communicate its evaluation processes using descriptive auto-explanation through symbolic reasoning. A case study is presented in an implementation of a game AI opponent that is capable of describing its inferential processes in a tabletop war game.