This knight definitely cannot be allowed on b4.
1. e2e4  1... e7e5  2. g1f3  2... g8f6 The Petroff defense is an important part of  Mamedyarov's opening repertoire. Still, it feels somewhat unusual. 3. f3e5  3... d7d6  4. e5f3  4... f6e4  5. d2d4  5... d6d5  6. f1d3  6... f8d6  7. e1g1  7... e8g8  8. c2c4  8... c7c6  9. d1b3  9... d5c4 Quite a fresh try. 10. d3c4 [#] 10... b7b5 Fighting for the control over the d5  square with a novelty. 11. c4d3  11... e4f6  12. f1e1 Dominguez is looking for a way to occupy the  e5-square as early as he can. 12... b8a6 