r1b1kq2/1p1p1pn1/p1n1p2r/3B3p/P2b3P/2R1PP1N/2PP4/1NBQ1K1R w q - 0 20
FEN state: r1b1kq2/1p1p1pn1/p1n1p2r/3B3p/P2b3P/2R1PP1N/2PP4/1NBQ1K1R w q - 0 20 ; Best move: c1a3
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8 and black queen at f8. Black pawn at b7, black pawn at d7, black pawn at f7 and black knight at g7. Black pawn at a6, black knight at c6, black pawn at e6 and black rook at h6. White bishop at d5 and black pawn at h5. White pawn at a4, black bishop at d4 and white pawn at h4. White rook at c3, white pawn at e3, white pawn at f3 and white knight at h3. White pawn at c2 and white pawn at d2. White knight at b1, white bishop at c1, white queen at d1, white king at f1 and white rook at h1. Black queenside is the only castle move available. Half move number is 0. Full move number is 20. White to move.