Chess puzzle (Advantage)
Opening: Scotch_Game, Scotch_Game_Schmidt_Variation
Moves: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Nf6 5. Nxc6 bxc6 6. Bc4 Be7 7. e5 Nd5 8.
Bxd5 cxd5 9. Qxd5 Ba6 10. Nc3 O-O 11. Ne4 c6 12. Qd4 Rb8 13. Nc5 *
Position (FEN): 1r1q1rk1/p2pbppp/b1p5/2N1P3/3Q4/8/PPP2PPP/R1B1K2R b KQ - 3 13
Black to move.
Themes:  Middlegame  
Puzzle rating: 1390
Best move: Qa5+