<https://secure.gravatar.com/avatar/2de399a89a0aeb81ee8c1b615d619cd2?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://becomingachessmaster.com/8-most-common-chess-openings/>