Schema: CREATE TABLE table_name_20 (grid VARCHAR, driver VARCHAR, constructor VARCHAR, laps VARCHAR)
Question: How many grids have a Constructor of talbot-lago - talbot, a Laps under 83, and a driver of johnny claes?
SQL: SELECT COUNT(grid) FROM table_name_20 WHERE constructor = "talbot-lago - talbot" AND laps < 83 AND driver = "johnny claes"