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_36849 ( "Name" text, "GP-GS" text, "Gain" real, "Loss" real, "Long" real, "Avg/G" text )

### Question ###
What is the average Loss for the long of more than 12 with a name of opponents with a Gain larger than 1751?

### Accurate SQL ###

SELECT AVG("Loss") FROM table_36849 WHERE "Long" > '12' AND "Name" = 'opponents' AND "Gain" > '1751'