CREATE TABLE table_name_83 (network VARCHAR2, year VARCHAR2, colour_commentator_s_ VARCHAR2)

For which network was Chris Walby the color commentator after 1990?
SELECT network FROM table_name_83 WHERE year > 1990 AND colour_commentator_s_ = "chris walby"
SELECT "network" FROM "table_name_83" WHERE "chris walby" = "colour_commentator_s_" AND "year" > 1990