1. c2c4  1... e7e5  2. b1c3  2... g8f6  3. g1f3  3... b8c6  4. e2e3  4... f8b4  5. d1c2  5... e8g8  6. c3d5  6... f8e8  7. c2f5  Quite a sharp opening choice by Duda, and excellent for blitz and rapid  chess. 7... d7d6 