Chess puzzle (Advantage)
Opening: Slav_Defense, Slav_Defense_Modern_Line
Moves: 1. d4 d5 2. c4 c6 3. Nf3 Bf5 4. Nc3 Nf6 5. Qb3 Qc7 6. cxd5 e6 7. dxc6 Nxc6 8.
e3 a6 9. a3 Bd6 10. Bc4 O-O 11. h3 *
Position (FEN): r4rk1/1pq2ppp/p1nbpn2/5b2/2BP4/PQN1PN1P/1P3PP1/R1B1K2R b KQ - 0 11
Black to move.
Themes:  Middlegame  
Puzzle rating: 1567
Best move: Na5