Chess puzzle (Advantage)
Opening: Russian_Game, Russian_Game_Italian_Variation
Moves: 1. e4 e5 2. Nf3 Nf6 3. Bc4 d5 4. exd5 Bd6 5. O-O O-O 6. Re1 *
Position (FEN): rnbq1rk1/ppp2ppp/3b1n2/3Pp3/2B5/5N2/PPPP1PPP/RNBQR1K1 b - - 4 6
Black to move.
Themes:  Opening  
Puzzle rating: 1494
Best move: e4