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_20957 ( "Country" text, "Skip" text, "W" real, "L" real, "PF" real, "PA" real, "Ends Won" real, "Ends Lost" real, "Blank Ends F/A" text, "Stolen Ends For" real, "Stolen Ends Against" real, "Shot %" real )

### Question ###
How many stolen ends against where there when Thomas Dufour was skip?

### Accurate SQL ###

SELECT "Stolen Ends Against" FROM table_20957 WHERE "Skip" = 'Thomas Dufour'