Chess puzzle (Crushing)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_Mason_Attack
Moves: 1. d4 d5 2. f4 e6 3. e3 Bd6 4. Nf3 f5 5. Bd3 Nc6 6. c3 Bd7 7. Ne5 Nf6 8. a4
Bxe5 9. fxe5 Ne4 10. Bxe4 Qh4+ 11. g3 Qxe4 12. O-O O-O *
Position (FEN): r4rk1/pppb2pp/2n1p3/3pPp2/P2Pq3/2P1P1P1/1P5P/RNBQ1RK1 w - - 2 13
White to move.
Themes:  Middlegame  
Puzzle rating: 1590
Best move: Rf4