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:
: You can view the official table of contents and an excerpt provided by the publisher to verify the coverage before purchasing. 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
: It explains how to reach the Hedgehog formation against the English (1.c4) and the Reti (1.Nf3). The most reliable way to get the content
To access the or digital version of The Hedgehog vs. the English/Reti by Igor Lysyj and Roman Ovetchkin, you can use several official and community platforms: Official Digital Versions