ปีใดมี 0 คะแนนและมีแชสซี AGS JH23B?ไม่จำเป็นต้องใช้ตารางทั้งหมด
Which year had 0 points and an AGS JH23B chassis?It is not neccessary to use all the tables.
 table_name_81:  (year [ VARCHAR ] points [ VARCHAR ] chassis [ VARCHAR) ]
SELECT year FROM table_name_81 WHERE points = 0 AND chassis = "ags jh23b"