user: Question: What is the BW 2013 ranking of Washington, D.C., which has an ARWU 2012 ranking greater than 51?
Columns: ['Location (State, City)', 'USN 2013', 'BW 2013', 'Forbes 2011', 'Ec 2013', 'FT 2011', 'AE 2011', 'CNN 2011', 'BI 2013', 'ARWU 2012']
Types: ['text', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real']
Sample row: ['Alabama, Auburn', 75.0, 1000.0, 1000.0, 1000.0, 1000.0, 1000.0, 1000.0, 1000.0, 1000.0]
SQL:

assistant: SELECT "BW 2013" FROM "Table" WHERE "ARWU 2012" > 51.0 AND "Location (State, City)" = 'Washington, D.C.';