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It sounds like you're referring to material—likely his Grandmaster Preparation series or other training content—which is sometimes shared in .pgn (Portable Game Notation) and .7z (compressed 7‑Zip) formats.
It sounds like you're referring to material—likely his Grandmaster Preparation series or other training content—which is sometimes shared in .pgn (Portable Game Notation) and .7z (compressed 7‑Zip) formats.