user: Question: Date of 23 September 1961, and a Pilot of B.V. Zemskov had what record description?
Columns: ['Date', 'Type', 'Record description', 'Achievement', 'Pilot']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['23 September 1961', 'Mi-10', 'Altitude with kg (lb) payload', 'm (ft)', 'G.V. Alfyorov']
SQL:

assistant: SELECT "Record description" FROM "Table" WHERE "Date" = '23 September 1961' AND "Pilot" = 'B.V. Zemskov';