AI Matching Strategy

http://www.demiurgestudios.com/engineer ... -opponent/

That's the dev blog that explains the logic.

My statement on the FAQ regarding prioritising TU is taken out of context. AI always takes a match 4 over a match 3 (as per the blog the AI doesn't see match 5). Once the match 4 or 3 decision has been made the subsequent decision is which color to match if multiple are available. This is prioritised by colors the AI has abilities for (doesn't distinguish between active or passive). My belief is TU is prioritised (it is in simple terms an active ability color) because the AI knows it drops new TU tiles as a smaller % chance (also stated in dev blog).