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_27877656_7 ( surface VARCHAR, score VARCHAR, edition VARCHAR )

### Question ###
For edition is 2011 europe/africa group iiib and surface where score is 6 4, 6 1 please specify all the surface

### Accurate SQL ###

SELECT surface FROM table_27877656_7 WHERE score = "6–4, 6–1" AND edition = "2011 Europe/Africa Group IIIB"