CREATE TABLE table_34543 ("Date" TEXT, "Tournament" TEXT, "Winning score" TEXT, "Margin of victory" TEXT, "Runner ( s ) -up" TEXT)

Who is runner-up where the winning score is 6 (65-70-70-69=274) and the margin of victory is 3 strokes?
SELECT "Runner(s)-up" FROM table_34543 WHERE "Margin of victory" = '3 strokes' AND "Winning score" = '–6 (65-70-70-69=274)'
SELECT "Runner(s)-up" FROM "table_34543" WHERE "Margin of victory" = '3 strokes' AND "Winning score" = '–6 (65-70-70-69=274)'