[6] The first person to significantly research this opening was chess amateur Otto Mandrup Tennison (1834–1909).

[7][8] Tennison was born in Denmark, studied in Germany and moved to the United States in 1854.

There, he played in the chess clubs of New Orleans.

Many strong players picked up the idea from the first half of the 20th century.

Otto M. Tennison vs. NN, New Orleans 1891: 1.