The wagering format changes, and facility improvements Louisiana Downs has made for its 84-date meet that opens Friday were done with the horseplayer in mind. The Bossier City, La., track has even moved the date of the Grade 2, $500,000 Super Derby back two weeks to Sept. 10, with the hopes of putting on the most competitive running possible. The race is the richest of the meet that continues through Sept. 25.