Jaenisch. Decouvertes sur le cavalier (aux echecs) par C.F.J. St. Petersbourg, Wienhoeber, 1837. St. Petersburg. 67 pages. 1 fold-out diagram. Very rare first edition dedicated to the endgames with the theme: KNKP(’s), where the King with the pawn(s) is trapped in the corner of a chessboard and is checkmated there by the Knight. L/N 4072. This book is wrongly classied as Mathematics in the L/N catalogue.

Carl Ferdinand von Jaenisch (1813–1872) was a Finnish-Russian chess player and theorist. He was among the top players in the world during the 1840s and made significant contributions to chess theory. Jaenisch initially pursued a military career in Finland but later moved to Saint Petersburg, where he taught rational mechanics. He dedicated his life to mathematics and chess, believing the two were closely related. 

Condition: Contemporary binding. Inside slightly yellowed, occasionally stained. A very good copy. Rare work. From David DeLucia's Chess Library.