Chess puzzle (Advantage)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_Mason_Attack
Moves: 1. d4 d5 2. f4 Nc6 3. Nf3 Bg4 4. Qd3 e6 5. Bd2 a6 6. a3 Nf6 7. g3 Bf5 8. Qb3
Rb8 9. Bg2 Bd6 10. Ne5 Na5 *
Position (FEN): 1r1qk2r/1pp2ppp/p2bpn2/n2pNb2/3P1P2/PQ4P1/1PPBP1BP/RN2K2R w KQk - 7 11
White to move.
Themes: Hanging Piece Opening  
Puzzle rating: 1742
Best move: Bxa5