Chess puzzle (Advantage)
Opening: Hippopotamus_Defense, Hippopotamus_Defense_Other_variations
Moves: 1. e4 Nh6 2. d4 c6 3. Bc4 b5 4. Bb3 a5 5. Bxh6 gxh6 6. Qh5 d5 7. exd5 *
Position (FEN): rnbqkb1r/4pp1p/2p4p/pp1P3Q/3P4/1B6/PPP2PPP/RN2K1NR b KQkq - 0 7
Black to move.
Themes:  Opening  
Puzzle rating: 1500
Best move: a4