SELECT "surface" FROM table_204_487 GROUP BY "surface" ORDER BY COUNT(*) DESC LIMIT 1
what was the surface at most of the games ?
CREATE TABLE table_204_487 (
    id number,
    "home team" text,
    "score" text,
    "visiting team" text,
    "location" text,
    "venue" text,
    "door" text,
    "surface" text
)