Deletion of Glicko rating system

Comment: There seems to be enough coverage out there for this to meet . For instance: https://scholar.google.com/scholar?q=%22Glicko+rating+system%22 Over sixty hits for this on Google Scholar. https://www.englishchess.org.uk/wp-content/uploads/2012/04/The_Glicko_system_for_beginners1.pdf Substantial discussion of its use in chess. https://www.betfair.com.au/hub/2018-wimbledon-glicko-preview/ Use of the system for making sport (tennis) predictions. Etc
Stance: keep
Cited policy: Wikipedia:Notability (WP:GNG)

Comment: in addition to above, we have https://books.google.co.uk/books?id=GnICBAAAQBAJ&pg=PA2&dq=Glicko+rating+system&hl=en&sa=X&ved=0ahUKEwihz-meicHjAhWoIDQIHWUUCbYQ6AEIPjAE#v=onepage&q=Glicko%20rating%20system&f=false, https://books.google.co.uk/books?id=z6_LDAAAQBAJ&pg=PA168&dq=Glicko+rating+system&hl=en&sa=X&ved=0ahUKEwihz-meicHjAhWoIDQIHWUUCbYQ6AEIQzAF#v=onepage&q=Glicko%20rating%20system&f=false, https://books.google.co.uk/books?id=ZVJLAAAAYAAJ&q=Glicko+rating+system&dq=Glicko+rating+system&hl=en&sa=X&ved=0ahUKEwihz-meicHjAhWoIDQIHWUUCbYQ6AEIUzAI, lots of papers etc. Sufficient for 
Stance: keep
Cited policy: Wikipedia:Notability (WP:GNG)