Chess puzzle (Equality)
Moves: 1. d4 d5 2. c4 dxc4 3. Nf3 Nc6 4. e3 Bg4 5. Bxc4 Nf6 6. Qb3 e6 7. Qxb7 Bxf3 8.
gxf3 Nxd4 9. exd4 Rb8 10. Qxa7 Bd6 11. O-O O-O 12. Nc3 Nd5 13. Nxd5 *
Position (FEN): 1r1q1rk1/Q1p2ppp/3bp3/3N4/2BP4/5P2/PP3P1P/R1B2RK1 b - - 0 13
Black to move.
Themes:  Middlegame  
Puzzle rating: 1565
Best move: exd5