user: Question: What stadium was the game played at when the result was Hunter Mariners def. Sheffield Eagles?
Columns: ['Date', 'Result', 'Score', 'Stadium', 'City', 'Crowd']
Types: ['text', 'text', 'text', 'text', 'text', 'real']
Sample row: ['20 June 1997', 'Adelaide Rams def. Oldham Bears', '42-14', 'Adelaide Oval', 'Adelaide', 13852.0]
SQL:

assistant: SELECT "Stadium" FROM "Table" WHERE "Result" = 'Hunter Mariners def. Sheffield Eagles';