Chess puzzle (Advantage)
Opening: French_Defense, French_Defense_Kings_Indian_Attack
Moves: 1. e4 e6 2. d3 Bc5 3. Nf3 c6 4. g3 Ne7 5. Bg2 O-O 6. O-O d5 7. d4 Bb6 8. e5 c5
9. Be3 cxd4 10. Bxd4 Nf5 11. Bxb6 Qxb6 12. b3 Nc6 13. Nc3 Ncd4 14. Nxd4 Nxd4 *
Position (FEN): r1b2rk1/pp3ppp/1q2p3/3pP3/3n4/1PN3P1/P1P2PBP/R2Q1RK1 w - - 0 15
White to move.
Themes:  Middlegame  
Puzzle rating: 1395
Best move: Na4