opening - Why does 6.Bg5 prevent 6e5 in the Sicilian Najdorf

In Gufeld's book, after 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5!, [FEN ""] 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5! he writes: "In this way White solves three

Should I play e6 or e5 in the Najdorf Sicilian? I heard that both are playable in most cases but there are some exceptions. - Quora

S. Bücker & C. Galofre - Chess Cafe - Over the Horizons - 1-74, PDF, Chess Openings

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Jeremy silman how to reassess your chess(text formated) by musiQsoulbrother - Issuu

opening - Why does 6.Bg5 prevent 6e5 in the Sicilian Najdorf? - Chess Stack Exchange

A deep dive into the Bg5 line in the Najdorf Sicilian

S. Bücker & C. Galofre - Chess Cafe - Over the Horizons - 1-74, PDF, Chess Openings

Gary Lane - Chess Cafe - Opening Lanes - 1-180

Learn the Najdorf: More 6.Bg5 Chess Openings Explained - NM Caleb Denby

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What do people play against your Sicilian Najdorf in classical OTB games? - Quora

Is it practical for me to play the Bg5 Najdorf as White? : r/chess

S. Bücker & C. Galofre - Chess Cafe - Over the Horizons - 1-74, PDF, Chess Openings