-- Database schema
| divisions : division [ TEXT ] primary_key , name [ TEXT ] , country [ TEXT ] | matchs : Div [ TEXT ] matchs.Div = divisions.division , Date [ DATE ] , HomeTeam [ TEXT ] , AwayTeam [ TEXT ] , FTHG [ INTEGER ] , FTAG [ INTEGER ] , FTR [ TEXT ] , season [ INTEGER ] |
-- -- What is the name of the division in which Club Brugge and Genk competed on September 13, 2009?

SELECT T2.name FROM matchs AS T1 INNER JOIN divisions AS T2 ON T1.Div = T2.division WHERE T1.Date = '2009-09-13' and T1.HomeTeam = 'Club Brugge' AND T1.AwayTeam = 'Genk';