Do not be misled by the the cover, which asserts that the book contains 'Betting Systems That Win!'. If making money by betting on horses were this easy, I would have been a billionaire by now. In fact the calculator is only necessary for those who need one to do a simple sum, and the systems outlined are the same as unlucky punters have been working out on the back of an envelope since time immemorial. The best thing to be said for the book is that it may stop you from making some egregious mistakes! ( )