CREATE TABLE table_name_21 (date VARCHAR, margin_of_victory VARCHAR, runner_s__up VARCHAR)

What date has a margin of victory of 1 stroke over Greg Kraft?
SELECT date FROM table_name_21 WHERE margin_of_victory = "1 stroke" AND runner_s__up = "greg kraft"
SELECT "date" FROM "table_name_21" WHERE "1 stroke" = "margin_of_victory" AND "greg kraft" = "runner_s__up"