Chess puzzle (Advantage)
Opening: Nimzo-Larsen_Attack, Nimzo-Larsen_Attack_Modern_Variation
Moves: 1. b3 e5 2. Bb2 Nc6 3. Nf3 e4 4. Nd4 Nxd4 5. Bxd4 d5 6. e3 Nf6 7. Nc3 c5 8. Be5
d4 9. exd4 cxd4 10. Bxf6 gxf6 11. Nxe4 Qe7 12. Qf3 *
Position (FEN): r1b1kb1r/pp2qp1p/5p2/8/3pN3/1P3Q2/P1PP1PPP/R3KB1R b KQkq - 2 12
Black to move.
Themes:  Middlegame  
Puzzle rating: 1220
Best move: f5