CREATE TABLE table_21034 ("Edition" CLOB, "Round" CLOB, "Date" CLOB, "Against" CLOB, "Surface" CLOB, "Opponent" CLOB, "W/L" CLOB, "Result" CLOB)

WHAT WAS THE SURFACE MADE OF WHEN THE OPPONENT WAS GEORGE KHRIKADZE?
SELECT "Surface" FROM table_21034 WHERE "Opponent" = 'George Khrikadze'
SELECT "Surface" FROM "table_21034" WHERE "Opponent" = 'George Khrikadze'