Joe Tuckers Guaranteed Improvement book and DVD is an easy to carry book that contains 10 competitive scoring drills that press you to improve each time you take it to the table. The Guaranteed Improvement book is also recommended for those high level players that aren’t to sure how to go about giving lessons. Larry Liscotti was a good example of this. He told Joe Tucker that he had a tough time filling an hour lesson but with these books he could go for two and track their progress.