About: http://webisa.webdatacommons.org/53438612

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	Top level chess games can last for 5-6 hours on end, and I could see players taking some sort of aid to keep concentration going for that long a period.
http://www.w3.org/ns/prov#wasQuotedFrom	slashdot.org