user: Question: What was the race with Nigel Mansell winning in Estoril?
Columns: ['Race', 'Date', 'Location', 'Pole Position', 'Fastest Lap', 'Race Winner', 'Constructor', 'Report']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Brazilian Grand Prix', '23 March', 'Jacarepaguá', 'Ayrton Senna', 'Nelson Piquet', 'Nelson Piquet', 'Williams - Honda', 'Report']
SQL:

assistant: SELECT "Race" FROM "Table" WHERE "Race Winner" = 'Nigel Mansell' AND "Location" = 'Estoril';