Oops! It's so easy to forget about this, as recapturing with 19.exd5 is the natural thing to do or expect.

Black also had to watch out for the 21.Nf6+ discovered check, winning the queen.

A nice finishing touch. Black resigned.

Avoiding the drawish tendencies of a pawnless center, which was quite important in this must-win last-round Olympiad game. Black is also left with a rather isolated outpost on e4, the vulnerability of which White will try to prove.

An ambitious move, with which Black aims to get rid of the strong Ne5 and perhaps support the e4-pawn later.

15.Ne5
Active play! White immediately seizes the opportunity to return to e5.

And White was a pawn up. Sometimes chess seems simple, and Karjakin went on to win this important game.

Alexander Alekhine, the fourth World Champion, was born on this day in 1892.
He ascended to the throne in 1927 by defeating his predecessor, Jose Raul Capablanca, and held the title until his death in 1946, with a short interruption between 1935-1937 (when Max Euwe reigned).