Carl Ferdinand von Jaenisch "Finland Baptisms, 1657-1890" database, FamilySearch, 7 December 2014. "Carl Ferdinand Jaenisch, 20 Apr 1813"; citing Church of Finland; FHL microfilm 55,715.An obituary in Deutsche Schachzeitung, September 1872, gives Friedrich as his middle name, and this has been widely copied. (; April 11, 1813 – March 7, 1872) was a Finnish and Russian chess player and theorist. In the 1840s, he was among the top players in the world.Adriano Chicco, Giorgio Porreca, Dizionario enciclopedico degli scacchi, Milan: Mursia, 1971
In 1842–43, he published a book on the chess opening in two volumes: Analyse Nouvelle des ouvertures. In 1862–63, he published his major work: Traité des applications de l'analyse mathématique au jeu des échecs, in three volumes.
He wanted to take part in the London 1851 chess tournament, but arrived late and instead played a match with Howard Staunton, which he lost +2–7=1. Three years later, he also lost to Ilya Shumov (+3–5=4).
The postmodern gambit 1.c4 b5!? is the Jaenisch Gambit, but while Jaenisch mentioned this move, he did not advocate it.
Staunton was most upset at his death in 1872, writing to Tassilo von Heydebrand und der Lasa in November of that year:
I was sorry to lose Lewis and St. Amant, my dear friends Bolton and Sir T. Madden, and others of whom we have been deprived, but for Jaenisch I entertained a particular affection, and his loss was proportionately painful to me. He was truly an amiable and an upright man. The Kibitzer by Tim Harding, ChessCafe.com
After Jaenisch's death, a scholarship fund in his honor, which survives to this day, was established by his sister.
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