Benko Gambit Declined: Sosonko Variation
ECO A57 · Benko Gambit Declined
The Benko Gambit Declined: Sosonko Variation (A57) is a chess opening in the Benko Gambit Declined family, played by White. It arises after the moves 1. d4 Nf6 2. c4 c5 3. d5 b5 4. a4.
Moves: 1. d4 Nf6 2. c4 c5 3. d5 b5 4. a4