Theopeningbookismadefromabout345,000gamesfromthelasttenyearswithbothplayersrated2300andup.Thestatsnexttomovesarehowmanygamesresultedinwins,drawsorlosses.Theconceptoriginatedfromcomputeropeningbooksasifwecanopenupthebookandseethemovesthatpeopleplayinresponsetochessopeningpositions.