Chess puzzle (Checkmate)
Opening: Zukertort_Opening, Zukertort_Opening_Tennison_Gambit
Moves: 1. e4 d5 2. Nf3 dxe4 3. Ng5 Nc6 4. Nxe4 e6 5. Nbc3 Nf6 6. d3 Nxe4 7. Nxe4 Be7
8. Be3 O-O 9. Qd2 f5 10. Nc3 e5 11. f3 Be6 12. O-O-O Nb4 13. a3 Na2+ 14. Nxa2
Bxa2 15. b3 *
Position (FEN): r2q1rk1/ppp1b1pp/8/4pp2/8/PP1PBP2/b1PQ2PP/2KR1B1R b - - 0 15
Black to move.
Themes: Queenside Attack Middlegame Double Bishop Mate, Mate in 1 
Puzzle rating: 636
Best move: Bxa3#