gistfile1.js

    var testCell = function (current, test) {

        var actor = current.piece;
        var target = test.piece;

        if (current == test && (!current.maze || actor.is('C'))) {
            return 'empty';
        }

        if (actor.is('M')) {
            if (Math.max(Math.abs(current.x - test.x), Math.abs(current.y - test.y)) > 2) {
                return 'tooFar';
            }
        }

        if (test.isEmpty()) {
            if (test.maze && !actor.is('C')) {
                return 'tooCasual';
            } else {
                return 'empty';
            }
        }

        if (target.color == actor.color) {
            return 'busy';
        }

        if (actor.is('N')) {
            return target.dead ? 'interact' : 'busy';
        }
        if (actor.is('P')) {
            return target.dead ? 'busy' : 'interact';
        }
        if (actor.is('M') && test.maze) {
            return 'tooCasual';
        }
        if (target.dead || actor.is('R')) {
            return 'busy';
        } else {
            return 'interact';
        }
    };