CREATE TABLE table_70472 ("Date" CLOB, "Tournament" CLOB, "Winning score" CLOB, "Margin of victory" CLOB, "Runner ( s ) -up" CLOB)

What was the winning score of the Buy.com Siouxland Open?
SELECT "Winning score" FROM table_70472 WHERE "Tournament" = 'buy.com siouxland open'
SELECT "Winning score" FROM "table_70472" WHERE "Tournament" = 'buy.com siouxland open'