Chapter numbers were brought in as being required for part of the answers to help ensure that answers weren't just looked up on a search engine. Actually, page numbers were first introduced for this reason - chapter numbers were added as a requirement due to the fact that books in different countries have different numbers of pages (and it appears from the answers provided in this quiz, even the UK must have different versions of paperbacks as UK page numbers quoted don't match my own books). I didn't intend to be "mean" to anyone and all Houses were marked based on the rules given.
Chomp (err, sorry, just in the middle of the word-sandwich).
Although it'll be more difficult for the aims in the first sentence of this post to be upheld due to differing versions of the books, I've no problem with the requirement for chapter numbers to be left out for future quizzes if the majority are in agreement.
Bite, Chomp...hey, these word sandwiches taste a bit like solid alphabet soup!