Carl Jaenisch (1813-1872) (apr 13, 1813 – mar 7, 1872)

Description:

Was a Finnish and Russian chess player and theorist. In the 1840s, he was among the top players in the world.

Jaenisch is best remembered for having analysed and helped develop Petrov's Defence with Alexander Petrov, and for his work on the Schliemann–Jaenisch Gambit of the Ruy Lopez, which begins 1.e4 e5 2.Nf3 Nc6 3.Bb5 f5!?