It was played by Alekhine by himself in Budapest in 1921, and this defense has borne his name ever since.
Today the theory is very developed and this opening is considered semi-correct. Players of the chess elite do not play it in the classics, but chess amateurs are happy to touch the knight with the first move!
In the recent years gained popularity Exchange Variation where White quickly develop the pieces of the queenside and ask Black questions.
But combinations solve all problems and now you will see it.