Non-compromised Pendulum () is a book about the fight system of the boxing coach Cus D'Amato, known as a peek-a-boo. The book, written by the Ukrainian scientist and martial arts researcher Oleg Maltsev and D'Amato's mentee Tom Patti, was published in the English language in 2018, which can be accessed by anybody free of charge, to preserve the legacy of Cus Damato. The history of writing The book Non-compromised Pendulum was preceded by the international project Science of Victory, dedicated to the memory of Cus D'Amato, coach of the three world boxing champions Jose Torres, Floyd Patterson and Mike Tyson. The marathon passed from 26 October 2017 to 4 November 2017. The project was attended by boxing champions, trainers, sports journalists, sports psychologists and martial arts experts from around the world who shared their thoughts on Casa D'Amato and his role in the history of professional boxing. The idea of the project and the writing of the book belongs to the Ukrainian scientist, candidate of psychological sciences, Oleg Maltsev, who studied the training system of D'Amato and the style of boxing he has created for more than 20 years. In order to test the results of the research and get information about the system, he began collaborating with D'Amato's student Tom Patti. In 2017 in New York, the authors completed the study and writing of the book. Reception The book is available for free in Russian and English languages. Overall Non-compromised Pendulum received favourable reviews from boxing scholars who knew D'Amato himself and/or researched his boxing style. A sports psychologist, former boxer and coach Alexander Balykin wrote in his review that the book should be read not only by coaches, but also by the athletes regardless of the sport they are doing. According to Alexander Balykin, the system of Cus D'Amato will be always relevant in all sports. He also notes the philosophical and psychological component in D'Amato's system. Although, he notes that by reading the "Non-compromised Pendulum" one will not become capable of using D'Amato's system. For a deeper understanding of Cus’ methodology in practice it is necessary to train with a professional coach and study additional methodological manuals. Dr. Antonio Graceffo compares the Non-compromised Pendulum with the Book of Five Rings by Miyamoto Musashi and with the treatise Art of War by Sun Tzu. Graceffo noted the concept "2 + 3 = 5" and its practical aspects in