This is what the author Sensei Bernardo Mercado has to say about the book:
"As some of you may know, I started karate training at San Francisco State University in 1981 with sensei Mayer Parry. I then joined sensei Leroy Rodrigues at the Shinkyu Shotokan Karate dojo in 1983 and he has been my instructor ever since. Immediately I noticed that he and his students had a different way of sparring than I had seen anywhere else. Shinkyu students had the ability of quickly closing distance and forcing opponents to retreat. Sensei Rodrigues called these techniques ‘push basics’ and told me that he learned this way of fighting from sensei Chuck Okimura in San Jose. He told me that the JKA developed these basics and that they were taught at the exclusive Instructors Training classes in Japan.
Over the years I’ve played around with arranging combinations and developing new techniques based on sensei Rodrigues’ push basics. Some black belt instructors and brown belts asked me many times to formalize and document the basics so they could practice on their own outside the dojo. My effort eventually developed into a book which contains fundamentals of push basics and 41 new combinations that I composed. This new book, ‘Tsuku Kihon: Advanced Fighting Techniques of Shotokan Karate’, is now published and available for purchase.
Push basics are only meant to be taught to solid brown belts and above, by someone with extensive experience and who knows how to execute them properly. These should not be taught until a student has diligently practiced regular kihon for at least 3 years and developed strong kime. Teaching tsuku kihon to anyone who is not ready is a bad idea and the technics will not work. In other words, students must first develop a strong foundation in karate basics prior to being exposed to tsuku kihon."
The book can be purchased by Amazon by clicking this link