SELECT legs FROM table_name_81 WHERE venue = "rwe-sporthalle, mülheim" AND runner_up__average_in_final_ = "simon whitlock (99.59)"
Apa kaki ketika venue adalah RWE-Sporthalle, Mülheim dan runner-up (rata-rata di final) adalah Simon Whitlock (99,59)?
CREATE TABLE table_name_81 (legs VARCHAR, venue VARCHAR, runner_up__average_in_final_ VARCHAR)