A Notable Chess Game By The Late Legendary Genius World Chess Champion GM.Alexander Alekhine !

Alexander Alexandrovich Alekhine (Russian: Алекса́ндр Алекса́ндрович Але́хин, pronounced [alʲɛkˈsandr̠ alʲɛkˈsandr̠ovʲitɕ aˈlʲɛxin])[1] (October 31, 1892 – March 24, 1946) was the fourth World Chess Champion. He is often considered one of the greatest chess players ever.By the age of twenty-two, he was already among the strongest chess players in the world. During the 1920s, he won most of the tournaments in which he played. In 1927, he became the fourth World Chess Champion by defeating Capablanca, widely considered invincible, in what would stand as the longest chess championship match held until 1985...(http://en.wikipedia.org/wiki/Alexander_Alekhine) Source of the photo : http://www.chess-theory.com/image4/alekhine01.jpg 

In the diagram on the right GM.Alekhine (white) wins elegantly by means of a beautiful combination...How ?