Database: riding_club
Question: Show the names and genders of players with a coach starting after 2011.
SQL: select t3.player_name ,  t3.gender from player_coach as t1 join coach as t2 on t1.coach_id  =  t2.coach_id join player as t3 on t1.player_id  =  t3.player_id where t1.starting_year  >  2011