Table: qfmr_episode
Columns: episode
first_broadcast
rufus_guest
marcus_guest
winner

Question: When was episode 2x11 aired for the first time?
SQL: SELECT "first_broadcast" FROM qfmr_episode WHERE "episode" = '2x11'

Question: Who won the episode in which Sean Lock was Rufus's guest?
SQL: SELECT "winner" FROM qfmr_episode WHERE "rufus_guest" = 'Sean Lock'

Question: When was the episode 2x10 aired for the first time?
SQL: SELECT "first_broadcast" FROM qfmr_episode WHERE "episode" = '2x10'

Question: Who was Marcus's guest in the episode when Rufus's guest was Rory McGrath?
SQL: SELECT "marcus_guest" FROM qfmr_episode WHERE "rufus_guest" = 'Rory McGrath'