Some classic chess books
Peach Tree "Tactical Combination Skills"
Riety's "Modern Chess Concept", this book is mainly about Rieti's interpretation of the Ritti (nf3) concept. From another perspective, the role of the understanding center is to use a theoretical book of different methods.
The details of Muller and Lambrecht's "The Secret of the Warrior's End" are very good. In the final stage, this is a better advanced book.
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