user: Question: What rank was caerphilly with a Swing smaller than 6.92?
Columns: ['Rank', 'Constituency', 'Winning party 2007', 'Swing to gain', "PC's place 2007", 'Result']
Types: ['real', 'text', 'text', 'real', 'text', 'text']
Sample row: [1.0, 'Carmarthen West & South Pembrokeshire', 'Conservative', 0.44, '3rd', 'Conservative hold']
SQL:

assistant: SELECT "Rank" FROM "Table" WHERE "Swing to gain" < 6.92 AND "Constituency" = 'caerphilly';