Black challenging repertoire against very popular London system. 1. d4 d5 2. Bf4 Nf6 3.e3 c5! The system works for both 1.d4 d5 and 1.d4 Nf6 players.
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Prices: Novice level : viewable file - 7$, downloadable file (pgn) - 10$
Club players: viewable file 8$, downloadable file (pgn) - 13$
Title seekers: viewable file 10$, downloadable file (pgn) - 15$