CREATE TABLE table_22886 ("Rank" FLOAT, "English title" TEXT, "Chinese title" TEXT, "Average" FLOAT, "Peak" FLOAT, "Premiere" FLOAT, "Finale" FLOAT, "HK viewers" TEXT)

What was the maximum average of the episode with a Chinese title b?
SELECT MAX("Average") FROM table_22886 WHERE "Chinese title" = '古靈精探B'
SELECT MAX("Average") FROM "table_22886" WHERE "Chinese title" = '古靈精探B'