Having the PGN is 10% of the work. Here is the 90% that improves your chess:

100 Endgames You Must Know by GM Jesús de la Villa is widely considered one of the most practical and efficient resources for mastering theoretical chess endgames. While the physical book is a classic, using it in format—often through platforms like Chessable or Forward Chess—transforms it into an interactive training tool. Core Highlights

In the "100 Endgames" PGN, you can expect to find:

For the uninitiated, stands for Portable Game Notation . It is a standard plain text format used to record chess games and positions. A PGN file allows you to take a chess game—or a specific position like those found in de la Villa’s book—and load it into chess software such as ChessBase, Lichess, Chess.com, or SCID.

—to complex piece versus piece scenarios, including rook against two pawns and same-color bishop endings. The Power of PGN and Interactivity

A typical entry in the PGN file for this book will look something like this:

Copy the PGN above into Lichess or ChessBase. Play through each endgame until you understand why the winning move works – not just memorize it.

If you obtain the digital file corresponding to the book, you shouldn't expect a collection of full grandmaster games. Endgame PGN files are unique. They are usually structured as or fragments .

[Site "Chapter 1: Basic Endgames"] [Result "1-0"] [White "King + Queen vs King + Rook"] [Black "Defense Strategy"]

: De la Villa emphasizes understanding "why" a move is made rather than rote memorization, providing simple rules and "guiding ideas".