In GoF, when Harry Potter is faced with a dragon, he used "accio" to get his broomstick and then grabbed the golden egg after some flying. My question is that why couldn't he do an "accio" on the Golden Egg itself? Is there a rule that the thing he was calling had to belong to him?

For that matter, why couldn't any other champion do this on Golden egg? Well, we can make a case for others that they just wouldn't have thought of it but Harry Potter came here with the intention of doing this so he must surely have done the simpler thing and called the golden egg itself instead of the broomstick.

BTW, the book says that the egg was under the dragon's body but the movie shows it placed at a prominent location fairly away from dragon and Harry. So, lets talk about book only. Was there a rule that he couldn't summon the egg since it was kind of strangled under the dragon's body?

In Goblet of Fire, when Harry Potter is faced with a dragon, he used 'Accio' to get his broomstick and then grabbed the Golden Egg after some flying. My question is, why couldn't he use 'Accio' on the Golden Egg itself? Is there a rule that the thing he was calling had to belong to him?

For that matter, why couldn't any other champion do this to the Golden Egg? Well, we can make a case that the others just wouldn't have thought of it but Harry Potter came there with the intention of doing a Summoning Charm. Surely he could've done the simpler thing and called the Golden Egg itself instead of the broomstick.

By the way, the book says that the egg was under the dragon's body but the movie shows it placed at a prominent location a fair distance away from the dragon and from Harry. So, let's talk about book only. Was there a rule that he couldn't summon the egg since it was kind of strangled under the dragon's body?