Chess puzzle (Advantage)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_Colle_System
Moves: 1. Nf3 d5 2. d4 e6 3. e3 Nf6 4. Be2 Bd6 5. O-O O-O 6. b3 Nbd7 7. c4 c6 8. c5
Bb8 9. Nbd2 Re8 10. Qc2 Qc7 11. g3 Nf8 12. Bd3 Ng6 13. e4 b6 14. cxb6 axb6 15.
e5 Ng4 16. Ba3 *
Position (FEN): rbb1r1k1/2q2ppp/1pp1p1n1/3pP3/3P2n1/BP1B1NP1/P1QN1P1P/R4RK1 b - - 2 16
Black to move.
Themes: Hanging Piece Middlegame  
Puzzle rating: 1425
Best move: Rxa3