Chess puzzle (Advantage)
Opening: Ruy_Lopez, Ruy_Lopez_Classical_Variation
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5 4. c3 Nf6 5. d4 exd4 6. e5 Qe7 *
Position (FEN): r1b1k2r/ppppqppp/2n2n2/1Bb1P3/3p4/2P2N2/PP3PPP/RNBQK2R w KQkq - 1 7
White to move.
Themes: Defensive Move Opening  Castling
Puzzle rating: 1504
Best move: O-O