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WikiPedia: Backgammon http://d-nb.info/gnd/4069063-5 http://id.ndl.go.jp/auth/ndlna/00577370 //dx.doi.org/10.2307%2F3257111 //www.jstor.org/stable/3257111 https://bkgm.com/rgb/rgb.cgi?view+688 https://www.bkgm.com/rules.html https://books.google.com/books?id=0SoloeOOtSkC&pg=... https://books.google.com/books?id=m6PfAwAAQBAJ&pg=... https://archive.org/details/hoylesruleso8fav00hoyl https://books.google.co.uk/books?id=0SoloeOOtSkC&p...