You guys. Judging just because of it's highly strange genre category.
Yeah - a Match-3 AI would be a computer that plays Match-3 somewhat half-way competently.
The premise that I'm working off of is that you, the player, are controlling a ship (or some other vehicle of destruction) in the foreground. In the background is a continuous Match-3 game going on. But you are
pissed because people just keep cranking out Match-3 games and people, like the computer, keep buying them and playing them.
Your mission becomes that of thwarting and preventing the computer AI from successfully completing Match-3 by destroying blocks. (Each block will have a center that will be able to be hit).
However, the computer really wants to play some damn match three, and blocks begin to spawn with the ability to shoot/increased defense/shift between colors/explode on death/etc/combination of two or three/ etc.