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This web page gobooks.com states the following, "Enjoy high-quality interactive books about the game of Go." We saw that the webpage also stated " Replay moves and solve problems directly within diagrams." It also said " A better experience than printed books, at half the price. Free chapter for each book. Play and replay moves in diagrams. Zoom partial diagrams to see whole board. Text enhanced with inline diagrams. Some multi-lingual books Japanese, German, French and Spanish. Buy once, read on all your devices. And Yuan Zhous How Not to Play Go." The header had go game as the highest ranking optimized keyword. It is followed by go book, go books, and go problems which isn't as ranked as highly as go game. The next words gobooks.com used was go software. smartgo was included but might not be understood by web crawlers.