Chess puzzle (Crushing)
Opening: Sicilian_Defense, Sicilian_Defense_Najdorf_Variation
Moves: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bd3 Nc6 7. Nxc6 bxc6 8.
O-O g6 9. Bg5 Bg7 10. Re1 O-O 11. e5 dxe5 12. Rxe5 Qc7 13. Qe2 *
Position (FEN): r1b2rk1/2q1ppbp/p1p2np1/4R1B1/8/2NB4/PPP1QPPP/R5K1 b - - 2 13
Black to move.
Themes:  Middlegame  
Puzzle rating: 1739
Best move: Ng4