If I order a pizza, the waiter must bring me a circular pasta cooked in the oven (preferably wood-fired) with a layer of tomato on the surface up to half a centimeter from the edge covered with mozzarella. This is the basis. Finally, you can season it with some ingredients such as ham, mushrooms, peppers, salami, artichokes, etc... but any type of strange dough cannot be defined as pizza. For the dough you need water, flour and yeast. It's that simple and I don't expect a regulation to define what a pizza is if the contest plans to cook one.
+1. I really didn't think that at this day and age when pizza is available all over the world we actually have to define what pizza actually is. Its like we are talking about some obscure meal only available in some remote villages and not one of the most popular dishes in the world.
By the way, for all those who really want to improve their pizza game (especially the dough which is by far the hardest part of making a good pizza) I suggest checking
Vito Iacopelli YouTube channel. That guy is a very good pizzaiolo and most importanly he is willing to share his knowledge.