Career
Not much is known about Mendheim"s life. By profession, he was probably a merchant. Earlier, he was a regular guest at the Old Club of Berlin (which existed from 1803 to 1847), but not a regular member there, despite having the reputation of being the best Berlin player.
Mendheim seemingly inspired Bledow and the forming of the Pleiades, but he died before the group was firmly established.
Mendheim"s strength can be seen from the fact that he single-handedly conducted the correspondence games that Berlin played against other cities (Breslau 1829-1833, Hamburg 1833-1836). He was an author of Taschenbuch für Schachfreunde (Berlin, published by Alexander Mosar, 1814) and Aufgaben für Schachspieler (Berlin, published by Traugott Trautwein, 1832).
He gets some mention in the Handbuch des Schachspiels section on problem composers.