I recently read a book where a very small detail was clearly stolen from Harry Potter. The detail was Wizards Chess. I got very annoyed, there was no variation at all and it was even called Wizards Chess. I know authors get inspiration from other authors, but how much is too much? Do you think I was wrong for knocking the book down a star for this?

Do you think using this small detail counts as plagerism or inspiration? Have you encoutered any books that your felt were a little too familiar in parts?