prefix bsbm: <http://www4.wiwiss.fu-berlin.de/bizer/bsbm/v01/vocabulary/>
  prefix bsbm-inst: <http://www4.wiwiss.fu-berlin.de/bizer/bsbm/v01/instances/>
  prefix rev: <http://purl.org/stuff/rev#>
  prefix xsd: <http://www.w3.org/2001/XMLSchema#>

  Select ?reviewer (avg(xsd:float(?score)) As ?reviewerAvgScore)
  {
    { Select (avg(xsd:float(?score)) As ?avgScore)
      {
        ?product bsbm:producer %Producer% .
        ?review bsbm:reviewFor ?product .
        { ?review bsbm:rating1 ?score . } UNION
        { ?review bsbm:rating2 ?score . } UNION
        { ?review bsbm:rating3 ?score . } UNION
        { ?review bsbm:rating4 ?score . }
      }
    }
    ?product bsbm:producer %Producer% .
    ?review bsbm:reviewFor ?product .
    ?review rev:reviewer ?reviewer .
    { ?review bsbm:rating1 ?score . } UNION
    { ?review bsbm:rating2 ?score . } UNION
    { ?review bsbm:rating3 ?score . } UNION
    { ?review bsbm:rating4 ?score . }
  }
  Group By ?reviewer
  Having (avg(xsd:float(?score)) > min(?avgScore) * 1.5)