1. e2e4  1... e7e5  2. g1f3  2... g8f6 The Petroff defence, which  always had a reputation of a drawish opening, is slowly turning into a silent counter-attacking tool. Remember how Caruana won the Berlin Candidates in 2018 $2 3. f3e5  3... d7d6  4. e5f3  4... f6e4  5. b1c3 This is considered to be the most aggressive way nowadays. 5... e4c3  6. d2c3  6... f8e7  7. c1e3  7... e8g8  8. d1d2  8... b8d7  9. e1c1  9... d7f6 