CREATE TABLE table_name_8 (championship VARCHAR, runner_s__up VARCHAR, margin VARCHAR)

Which Championship was louise suggs the runner-up by 3 strokes?
SELECT championship FROM table_name_8 WHERE runner_s__up = "louise suggs" AND margin = "3 strokes"
SELECT "championship" FROM "table_name_8" WHERE "3 strokes" = "margin" AND "louise suggs" = "runner_s__up"