How many {chairperson} are to/by {Garry Kasparov} ?
Which is the number of chair people that there are in the Garry Kasparov?
How many chair persons are there in the {Garry Kasparov} ?
SELECT ( COUNT ( ?j ) AS ?s ) { ?j property:chairperson resource:Garry_Kasparov }
SELECT (COUNT(?sub) AS ?subs ) {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?sub .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P488> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> http://wikidata.dbpedia.org/resource/Q28614 .
} 

SELECT (COUNT(?sub) AS ?value ) { ?sub wdt:P488 wd:Q28614 }
4