The most reliable way to get the content in a digital, interactive format (often including a PGN-style viewer) is through authorized chess ebook platforms:
: Offers the 444-page paperback through their online store. Guide Overview This guide is highly regarded for being "solid" because it: The most reliable way to get the content
: The content is grounded in Igor Lysyj's successful high-level practical experience, including games from the Russian Championship. The most reliable way to get the content
: A digital copy titled Mastering the Hedgehog in Chess is available for reading online or as a PDF/TXT download. Physical & Other Formats The most reliable way to get the content