The score depends of
1. the query
2. the matched document
3. the index.

I don't really understand why the index must influence the score (why it ahs been implemented that way).

Let's say I have this page Logistics.htm
I have just one time the word "experience" in it.
It will get a high score because of the IDF but it occurs only once in my document.



Internet communications are not secure and therefore Fortis Banque Luxembourg S.A. does not accept legal responsibility for the contents of this message. The information contained in this e-mail is confidential and may be legally privileged. It is intended solely for the addressee. If you are not the intended recipient, any disclosure, copying, distribution or any action taken or omitted to be taken in reliance on it, is prohibited and may be unlawful. Nothing in the message is capable or intended to create any legally binding obligations on either party and it is not intended to provide legal advice.