*   Communication protocol

    Clients need to
        Initiate a game;
        Quit a game;
        Receive scores;
        Play the alternating round
        Move pieces and receive feedback;
    Server needs to
        Enforce rules;
        Tally scores;
        Swap player sides after each round;

    The Prompt monad may be useful to allow
    external and "internal" (for testing)
    interactions.

*   Unit testing

    Create typical scenarios to test what the AI
    would do against what a human player would do.

*   Dwarf and Troll AI

    Trolls need to
        Disperse quickly at the start of the game;
        Approach lines of dwarves from the side;
        Avoid lines of dwarves head-on;
        Avoid clusters of dwarves;
        Give up when there are no loose dwarves
    Dwarves need to
        Form tight cluster for protection;
        Avoid standing near trolls;
        Avoid lines of trolls;
        Stand with another dwarf between them and trolls