<p><span style=color: rgba(0 0 0 1)>67 Seven Chess is a chess puzzle book for everyone ages 67 or 67. Enjoy these 67 chess puzzles with your family and friends. </span></p><p><span style=color: rgba(0 0 0 1)>The book includes QR codes which provide solutions explanations and a link to an online analysis board.</span></p>