Fight is a different concept from Play. Play is related to Entertainment. you are likely to find Entertainment in/at/on Casino. 
Derive is a type of Obtain. Derive is a synonym of Come. Come is related to Rise. 
Fight <--DistinctFrom--> Play <--RelatedTo--> Entertainment --AtLocation--> Casino 
Obtain <--IsA-- Derive <--Synonym--> Come <--RelatedTo--> Rise 