Tassilo, BaronvonHeydebrandundderLasa (known in English as "BaronvonderLasa", October 17 1818, Berlin–July 27 1899, Storchnest near Lissa, then Germany) was an important German chessmaster, chess historian and theoretician of the nineteenth century, a member of the Berlin Chess Club and a founder of the Berlin Chess School.
VonderLasa did not play in tournaments, being usually busy as an organizer, but played well in off-hand games against such leading masters as Howard Staunton and Adolf Anderssen.