[%c_effect c5;square;c5;type;Interesting;persistent;true] A risky move. Black's most reputable move is 5...d5, with long forced lines that usually lead to a draw. Aronian is a very creative player, and sometimes he shows interesting and deep ideas in the opening.
1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. b1c3  3... f8b4  4. d1c2  4... e8g8  5. e2e4 