\"I knew this line is playable. Black accepts a slightly worse position.\" (Caruana)
1. d2d4  1... g8f6  2. g1f3  2... d7d5  3. c1f4 An unexpected opening choice by Duda, at least for his opponent. 3... g7g6  4. e2e3  4... f8g7  5. f1e2  5... e8g8  6. b1d2  6... c7c5  7. c2c3 