About: http://webisa.webdatacommons.org/381311991

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	I cannot see anything else, other than a similar chain in the same cells as the XY-wing.
http://www.w3.org/ns/prov#wasQuotedFrom	dailysudoku.com