1. e2e4  1... e7e5  2. g1f3  2... g8f6  3. f3e5  3... d7d6  4. e5f3  4... f6e4  5. d2d4  5... d6d5  6. f1d3  6... f8d6 This variation of the Petroff Defense is very popular nowadays. Nepomniachtchi had great success with it in last year's Candidates Tournament. 7. e1g1  7... e8g8  8. c2c4  8... c7c6  9. f1e1  9... c8f5 