user: Question: What is the average position for TB2L teams Promoted Champion?
Columns: ['Season', 'Tier', 'League', 'Pos.', 'Postseason', 'Turkish Cup']
Types: ['text', 'real', 'text', 'real', 'text', 'text']
Sample row: ['2008–09', 2.0, 'TB2L', 1.0, 'Final Stage 3rd', '–']
SQL:

assistant: SELECT AVG("Pos.") FROM "Table" WHERE "League" = 'TB2L' AND "Postseason" = 'Promoted Champion';