Chess puzzle (Advantage)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_Colle_System
Moves: 1. d4 d5 2. Nf3 Nf6 3. e3 Bf5 4. Be2 c6 5. c4 Nbd7 6. cxd5 Nxd5 7. O-O N5b6 8.
Nbd2 e6 9. b3 Bd6 10. Bb2 Qe7 11. d5 Nxd5 *
Position (FEN): r3k2r/pp1nqppp/2pbp3/3n1b2/8/1P2PN2/PB1NBPPP/R2Q1RK1 w kq - 0 12
White to move.
Themes:  Middlegame  
Puzzle rating: 1638
Best move: e4