CREATE TABLE table_203_151 (id DECIMAL, "no." DECIMAL, "date" TEXT, "tournament" TEXT, "winning score" TEXT, "margin of\ victory" TEXT, "runner ( s ) -up" TEXT)

how many more strokes were in the klm open than the barclays scottish open ?
SELECT (SELECT "margin of\nvictory" FROM table_203_151 WHERE "tournament" = 'klm open') - (SELECT "margin of\nvictory" FROM table_203_151 WHERE "tournament" = 'barclays scottish open')
SELECT (SELECT "margin of\nvictory" FROM "table_203_151" WHERE "tournament" = 'klm open') - (SELECT "margin of\nvictory" FROM "table_203_151" WHERE "tournament" = 'barclays scottish open')