Chess puzzle (Advantage)
Opening: Grob_Opening, Grob_Opening_Other_variations
Moves: 1. g4 c5 2. Bg2 d6 3. c3 Bxg4 4. Qb3 Nc6 *
Position (FEN): r2qkbnr/pp2pppp/2np4/2p5/6b1/1QP5/PP1PPPBP/RNB1K1NR w KQkq - 2 5
White to move.
Themes:  Opening  
Puzzle rating: 1506
Best move: Qxb7