What was the potiential for Francesco Parravicini on 2010/8/30?
Francesco Parravicini refers to player_name = 'Francesco Parravicini'; on 2010/8/30 refers to date = '2010-08-30 00:00:00'
SELECT t2.potential FROM Player AS t1 INNER JOIN Player_Attributes AS t2 ON t1.player_api_id = t2.player_api_id WHERE SUBSTR(t2.`date`, 1, 10) = '2010-08-30' AND t1.player_name = 'Francesco Parravicini'