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_56013 ( "Agent" text, "Melting / boiling point" text, "Effectiveness as blood agent" real, "Persistence, open area" real, "Persistence, enclosed area" real, "Field stability" real, "Storage stability" real, "Toxicity as blood agent" real )

### Question ###
What is the field stability of Cyanogen Bromide that has an effectiveness of 9?

### Accurate SQL ###

SELECT COUNT("Field stability") FROM table_56013 WHERE "Agent" = 'cyanogen bromide' AND "Effectiveness as blood agent" > '9'