Chess puzzle (Advantage)
Opening: Ruy_Lopez, Ruy_Lopez_Berlin_Defense
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Ng4 5. h3 h5 6. hxg4 *
Position (FEN): r1bqkb1r/pppp1pp1/2n5/1B2p2p/4P1P1/5N2/PPPP1PP1/RNBQ1RK1 b kq - 0 6
Black to move.
Themes:  Opening  
Puzzle rating: 1066
Best move: hxg4