private boolean isNearby(TurnCoordinate tc1, TurnCoordinate tc2) {
        if((tc1.x - tc2.x) == 2 || (tc1.x - tc2.x) == -2) {
            return false;
        }        
        if((tc1.y - tc2.y) == 2 || (tc1.y - tc2.y) == -2) {
            return false;
        }        
        return true;
    }