Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_203_151 ( id number, "no." number, "date" text, "tournament" text, "winning score" text, "margin of\nvictory" text, "runner(s)-up" text )

### Question ###
how many more strokes were in the klm open than the barclays scottish open ?

### Accurate SQL ###

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')