Table: kerber_tournaments
Columns: tournament
2006
2007
2008
2009
2010
2011
2012
2013

Question: Which tournament has a value of a for 2009?
SQL: SELECT "tournament" FROM kerber_tournaments WHERE "2009" = 'a'

Question: What is the value for 2011 when `a` is the value for 2009, and 4r is the value for 2013?
SQL: SELECT "2011" FROM kerber_tournaments WHERE "2009" = 'a' AND "2013" = '4r'