If you're interested in improving your calculation skills, I recommend checking out this book and other resources to find the best fit for your needs.
Jacob Aagaard is a renowned chess author, and his books are popular among chess players of all levels. He has written several books on various chess topics, including "Excelling at Chess," "Grandmaster Preparation," and "The Art of Attack."
"Técnicas de Cálculo" (or "Calculating Strategies" in English) is a chess book written by Jacob Aagaard, a well-known Danish chess grandmaster and author. The book focuses on teaching chess players how to improve their calculation skills, which is an essential aspect of chess.
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"Técnicas de Cálculo" by Jacob Aagaard is a valuable resource for chess players looking to improve their calculation skills. The book is available in PDF format through various online sources. While there are other resources available on calculation skills, Aagaard's book is a well-regarded and comprehensive guide.