Chess puzzle (Advantage)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_Accelerated_London_System
Moves: 1. d4 d5 2. Bf4 Nc6 3. c4 Nf6 4. cxd5 Nxd5 5. Bg3 e6 6. e4 Ndb4 7. a3 Na6 8.
Nc3 Nxd4 9. Qa4+ c6 *
Position (FEN): r1bqkb1r/pp3ppp/n1p1p3/8/Q2nP3/P1N3B1/1P3PPP/R3KBNR w KQkq - 0 10
White to move.
Themes:  Opening  
Puzzle rating: 1500
Best move: Rd1