We have a new tutorial on Okapi Simple BM25 with Extension to Multiple Fields.
http://www.miislita.com/information-retrieval-tutorial/okapi-simple-bm25f-tutorial.pdf
Unlike the BM25, this model (known as Simple BM25F) incorporates the structure of documents into the scoring process.
In addition, we’ve uploaded a new, improved, and expanded version of the Okapi Best Match 25 tutorial.
http://www.miislita.com/information-retrieval-tutorial/okapi-bm25-tutorial.pdf
Have a great IR day!
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