CREATE TABLE table_204_22 (id DECIMAL, "date" TEXT, "opponent#" TEXT, "rank#" TEXT, "site" TEXT, "result" TEXT, "attendance" DECIMAL, "record" TEXT)

whem was illinois ' highest scoring game ?
SELECT "date" FROM table_204_22 ORDER BY "result" DESC LIMIT 1
SELECT "date" FROM "table_204_22" ORDER BY "result" DESC NULLS LAST LIMIT 1