1nb1kbnr/r3p1p1/p2q3p/p1pp1p2/P2N1P2/4PK1B/1PPP3P/1RB2Q1R b k - 4 15
FEN state: 1nb1kbnr/r3p1p1/p2q3p/p1pp1p2/P2N1P2/4PK1B/1PPP3P/1RB2Q1R b k - 4 15 ; Best move: c5d4
The current state of the chess board is: Black knight at b8, black bishop at c8, black king at e8, black bishop at f8, black knight at g8 and black rook at h8. Black rook at a7, black pawn at e7 and black pawn at g7. Black pawn at a6, black queen at d6 and black pawn at h6. Black pawn at a5, black pawn at c5, black pawn at d5 and black pawn at f5. White pawn at a4, white knight at d4 and white pawn at f4. White pawn at e3, white king at f3 and white bishop at h3. White pawn at b2, white pawn at c2, white pawn at d2 and white pawn at h2. White rook at b1, white bishop at c1, white queen at f1 and white rook at h1. Black kingside is the only castle move available. Half move number is 4. Full move number is 15. Black to move.