It is unlikely that anyone reading this won't be familiar with the rules, but esoteric rules like nib and being in or out of huff and the Plymouth and Hampton Court variations (C. 16th and 17th Centuries respectively) may need to be elaborated on. A good Mornington Crescent referee will of course be well versed in these potential pitfalls, and can refer to a complete copy of the rules, vis, the one on their bookshelf. Any questions?