source_results = [
          { "place" => "1", "participant_id" => 1, "event_id" => 1, "race_id" => 1 },
          { "place" => "2", "participant_id" => 2, "event_id" => 1, "race_id" => 1 },
          { "place" => "3", "participant_id" => 3, "event_id" => 1, "race_id" => 1 },
          { "place" => "1", "participant_id" => 1, "event_id" => 2, "race_id" => 2 },