CREATE TABLE table_6978 ("Date" TEXT, "Tournament" TEXT, "Surface" TEXT, "Partnering" TEXT, "Opponents in the final" TEXT, "Score" TEXT)

What was the score of the game that was played on a grass surface?
SELECT "Score" FROM table_6978 WHERE "Surface" = 'grass'
SELECT "Score" FROM "table_6978" WHERE "Surface" = 'grass'