What surface was played on when Piet Norval was a partner?
CREATE TABLE table_name_24 (surface VARCHAR, partner VARCHAR)
SELECT surface FROM table_name_24 WHERE partner = "piet norval"
### Context: CREATE TABLE table_name_24 (surface VARCHAR, partner VARCHAR) ### Question: What surface was played on when Piet Norval was a partner? ### Answer: SELECT surface FROM table_name_24 WHERE partner = "piet norval"