Actually, it is quite obvious to any person who has adequatlyadequately read the book, that it was Professor Flitwick who made the Wizard's Chess game, and Professor McGonagall who created the obstacle of catching a flying key. These keys are not completely transfigurated, but there is no known charm that Professor Flitwick could have performed to attach wings to the keys. Another reason; the game of Wizard's Chess was not transfigurated, but rather enlarged using the charm Augeo. Not to be confused with the Engorgment charm, Engorgio.