user: Question: Who was the winner of the game in 1999 with Kansas City Chiefs as the loser?
Columns: ['Year', 'Date', 'Winner', 'Result', 'Loser', 'Location']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1990.0, 'November 4', 'Kansas City Chiefs', '9–7', 'Los Angeles Raiders', 'Arrowhead Stadium']
SQL:

assistant: SELECT "Winner" FROM "Table" WHERE "Year" = 1999.0 AND "Loser" = 'Kansas City Chiefs';