Who won the episode in which Sean Lock was Rufus's guest?
CREATE TABLE "table1_19930660_2" (
  "episode" text,
  "first_broadcast" text,
  "rufus_guest" text,
  "marcus_guest" text,
  "winner" text
);
SELECT "winner" FROM "table1_19930660_2" WHERE "rufus_guest"='Sean Lock';