1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1c4  3... g8f6  4. d2d3  4... h7h6  5. c2c3  5... d7d6  6. e1g1  6... g7g5 [%cal dg7g5][%c_arrow g7g5;keyPressed;none;from;g7;opacity;0.8;to;g5;persistent;false] With his opening choice, Nakamura shows he's coming for the win. This is an aggressive system that has become more or less popular in recent years but not so much in elite games. Naturally, this advance is risky, and it's no wonder that classical players don't play like this, but the computer and recent theory demonstrate that this move is completely viable.