How many group legs were won with player Mark Dudbridge?
CREATE TABLE "prize_money_won" (
  "player" text,
  "group_legs_won" real,
  "play_off_legs_won" real,
  "winners_group_legs_won" real,
  "winners_play_off_legs_won" real,
  "final_position_money_won" text,
  "total_money_won" text
);
SELECT "winners_group_legs_won" FROM "prize_money_won" WHERE "player"='Mark Dudbridge';