Harrwitz made his way to the famed Café de la Régence by the age of 22. He was a good chess player, skilled in odds and blindfold games. He soon became one of the leading players in the great old cathedral of French chess.
He would usually give more generous odds than most other strong masters. One exchange between himself and an amateur, supplied by G. A. Macdonnell, went as follows:
"What odds will you give me?" asked a provincial youth of a well-known player at the Divan, as they were arranging the pieces on a board close to the table at which I was sitting. "Well, let me see," said the celebrity. "How do you play with Mr. B. and Mr. O.?" (naming two magnates). "They give me a knight, and win a slight majority." "Then I will give you a rook."