Chess puzzle (Advantage)
Opening: Zukertort_Opening, Zukertort_Opening_Tennison_Gambit
Moves: 1. e4 d5 2. Nf3 dxe4 3. Ne5 Nf6 4. Bc4 e6 5. O-O Bd6 6. f4 Bxe5 7. fxe5 Qd4+ 8.
Kh1 Qxe5 9. Nc3 Nc6 10. d3 exd3 11. cxd3 Bd7 12. Bf4 Qd4 *
Position (FEN): r3k2r/pppb1ppp/2n1pn2/8/2Bq1B2/2NP4/PP4PP/R2Q1R1K w kq - 3 13
White to move.
Themes:  Middlegame  
Puzzle rating: 1507
Best move: Nb5