Chess puzzle (Advantage)
Opening: Nimzowitsch_Defense, Nimzowitsch_Defense_Other_variations
Moves: 1. e4 Nc6 2. Bc4 e6 3. Nf3 d5 4. exd5 exd5 5. Bb3 Be6 6. d4 a5 7. Bf4 a4 8.
Bxd5 Bxd5 9. Nc3 Bxf3 10. Qxf3 Nxd4 11. Qe3+ Ne7 *
Position (FEN): r2qkb1r/1pp1nppp/8/8/p2n1B2/2N1Q3/PPP2PPP/R3K2R w KQkq - 2 12
White to move.
Themes: Defensive Move Middlegame  Castling
Puzzle rating: 1819
Best move: O-O-O