user: Question: When the Points 1 was 51 and the Goals Against was less than 66, what was the Goal Difference?
Columns: ['Position', 'Team', 'Played', 'Drawn', 'Lost', 'Goals For', 'Goals Against', 'Goal Difference', 'Points 1']
Types: ['real', 'text', 'real', 'real', 'real', 'real', 'real', 'text', 'text']
Sample row: [1.0, 'Stafford Rangers', 42.0, 8.0, 8.0, 81.0, 40.0, '+41', '86']
SQL:

assistant: SELECT "Goal Difference" FROM "Table" WHERE "Points 1" = '51' AND "Goals Against" < 66.0;