I bought 'Kyusho Secrets' book ages ago, one of the first books to show in detail the kyusho points and bunkai for all of the Heian/Pinan Kata, with other chapters based around other aspects of improving practical effective techniques.

I have had it so long that I sometimes take it for granted forgetting that newer karate-ka would not know of it, at all. Its massively important (not just to me) as it introduced this effective type of Kata analysis to many of those who today are considered 'experts. In the field ' Still available from www.kissakikarate.com.'