What suface during the game that had Yevgeny Kafelnikov as an opponent?
CREATE TABLE table_name_38 (surface VARCHAR, opponent VARCHAR)
SELECT surface FROM table_name_38 WHERE opponent = "yevgeny kafelnikov"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_38 (surface VARCHAR, opponent VARCHAR) Question: What suface during the game that had Yevgeny Kafelnikov as an opponent? [/INST] SELECT surface FROM table_name_38 WHERE opponent = "yevgeny kafelnikov" </s>