CREATE TABLE table_name_27 (winning_score VARCHAR2, margin_of_victory VARCHAR2, runner_s__up VARCHAR2)

What is the winning score where the runner-up is Robert-Jan Derksen and the margin of victory is 1 stroke?
SELECT winning_score FROM table_name_27 WHERE margin_of_victory = "1 stroke" AND runner_s__up = "robert-jan derksen"
SELECT "winning_score" FROM "table_name_27" WHERE "1 stroke" = "margin_of_victory" AND "robert-jan derksen" = "runner_s__up"