comment: The most popular move nowadays. Interestingly, Keymer is quite used to playing this position as Black, having last played it in an important Olympiad game last year.
context: 1. e2e4  1... c7c6  2. g1f3  2... d7d5  3. b1c3 The Two Knights Variation is a good choice for White in the Caro-Kann, ideal for someone who likes to play with the bishops, since in the main line Black quickly exchanges the light-squared bishop for a knight. This reason is probably why it was one of the favorite lines of Bobby Fischer; the American genius had a well-documented preference for positions with a bishop against a knight. 3... c8g4  4. h2h3  4... g4f3  5. d1f3  5... e7e6 