Topalov Anti-Benko Line

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Avatar of Lane-TIOBE

So, in an effort to learn some of the more interesting openings I've dove head first into the Benko Gambit. It serves two purposes. One is that I get to learn the Benko Gambit and the second is that I get to learn how to play against it. I know that some have found some solid gameplay with 1...c5 (against d4) . How sound is 1. d4 Nf6 2. Nf3 2. c5?