Chess puzzle (Advantage)
Opening: Benoni_Defense, Benoni_Defense_Benoni_Gambit_Accepted
Moves: 1. d4 c5 2. dxc5 e5 3. b4 e4 4. c4 *
Position (FEN): rnbqkbnr/pp1p1ppp/8/2P5/1PP1p3/8/P3PPPP/RNBQKBNR b KQkq - 0 4
Black to move.
Themes:  Opening  
Puzzle rating: 1121
Best move: Qf6