This book is a bit of an enigma. Some of the concepts make perfect sense and are well explained, others make very little sense in the descriptions and the examples used to describe them come from some very obscure games that I had real problems even finding the rules for! If you have read the better known books and are looking to further your knowledge, then there are some things in here that I haven't found elsewhere, but it is by no means essential reading. I don't think my poker playing materially improved after reading this, which is the whole point of buying these books really. If you haven't read 'Harrington on Hold em', 'Super System' or 'Theory of Poker' then go for these first