CREATE TABLE table_name_98 (winning_score VARCHAR(255), margin_of_victory VARCHAR(255), runner_s__up VARCHAR(255))
What was the winning score for the tournament where Garth Mulroy was the runner-up, and the margin of victory was 1 stroke?
    
SQL: SELECT winning_score FROM table_name_98 WHERE margin_of_victory = "1 stroke" AND runner_s__up = "garth mulroy"