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_18183850_12 ( edition VARCHAR, surface VARCHAR, outcome VARCHAR )

### Question ###
What was the game edition when they played on the clay (i) surface and the outcome was a winner?

### Accurate SQL ###

SELECT edition FROM table_18183850_12 WHERE surface = "Clay (i)" AND outcome = "Winner"