CREATE TABLE table_861 ("Season" FLOAT, "Winner" CLOB, "BYU-UU score" CLOB, "BYU-USU score" CLOB, "UU-USU score" CLOB)

what is the maximum season with byu-uu score being 20 17 byu #19
SELECT MAX("Season") FROM table_861 WHERE "BYU-UU score" = '20–17 BYU #19'
SELECT MAX("Season") FROM "table_861" WHERE "BYU-UU score" = '20–17 BYU #19'