My favorite is BCO2, as that's the one I started with, and I find the format easiest. That said I've lost it, so I now use the 'small' ECO. I have MCO, but rarely use it, as I don't like the format.
Favorite Chess Openings "Bible" ?

I only have MCO-14, so I can't really compare them. Besides, I play a lot of oddball openings that aren't covered in these types of books.
--Fromper

HI!!!!!
MY Favourites are this:
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i think the question used the word bible metaphorically, which means your most trusted book when it comes to guidelines...hope you get my point, let's not start any arguements here...
peace all.

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When I started playing tourney chess in the US Southeast (1973) my first openings "bible" was MCO. Over the years I have now 3 such books: MCO, BCO and NCO . sorry : Modern Chess Openings, Batsford Chess Openings and Nunn's Chess Openings. My favorite of the 3 is NCO and I ofen take it with me to tournies. My question is which is your personal favorite? I know there are others I dont have and am sure I will see many named in this thread.