Chess puzzle (Advantage)
Opening: English_Opening, English_Opening_Carls-Bremen_System
Moves: 1. c4 e5 2. Nc3 Nf6 3. g3 Nc6 4. Bg2 Bc5 5. e3 d5 6. cxd5 Nb4 7. d3 Nbxd5 8.
Nge2 O-O 9. h3 Be6 10. a3 c6 11. Qc2 Qa5 12. O-O Qb6 *
Position (FEN): r4rk1/pp3ppp/1qp1bn2/2bnp3/8/P1NPP1PP/1PQ1NPB1/R1B2RK1 w - - 4 13
White to move.
Themes:  Middlegame  
Puzzle rating: 1706
Best move: Na4