If you don't have CB, I'd recommend http://www.shredderchess.com/online-chess/online-databases/opening-database.html
as a good database - the reason is that the database is compiled ONLY from GM games.
What sites, blogs, etc have you found instrumental in researching openings.
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Thanks
Chessopenings.com
What's the best source for annotated games in a particular opening/ defence that has a wide database per opening?
I have found that the games database at chesstempo.com/game-database.html to be extremely flexible and robust. You can quickly analyze many variations and use any part of the games database for analysis (e.g. GM, > 2400, etc.) I haven't found a better tool on the Net. I use it conjunction with Houdini for analysis of different lines.
The purpose of this forum is to save players a considerable amount of time in scouring the internet in an attempt to research an opening so please feel 0free to post your favourite links.