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_name_51 (losses VARCHAR, south_west_dfl VARCHAR, against VARCHAR)

### Question ###
How many Losses have South West DFL of coleraine, and an Against smaller than 891?

### Accurate SQL ###

SELECT COUNT(losses) FROM table_name_51 WHERE south_west_dfl = "coleraine" AND against < 891