1nbqk3/2p1p2N/3p1prr/pp6/P4PP1/BPb4P/2PP1P2/RN1QKB1R b Q - 1 21
FEN state: 1nbqk3/2p1p2N/3p1prr/pp6/P4PP1/BPb4P/2PP1P2/RN1QKB1R b Q - 1 21 ; Best move: c3a1
The current state of the chess board is: Black knight at b8, black bishop at c8, black queen at d8 and black king at e8. Black pawn at c7, black pawn at e7 and white knight at h7. Black pawn at d6, black pawn at f6, black rook at g6 and black rook at h6. Black pawn at a5 and black pawn at b5. White pawn at a4, white pawn at f4 and white pawn at g4. White bishop at a3, white pawn at b3, black bishop at c3 and white pawn at h3. White pawn at c2, white pawn at d2 and white pawn at f2. White rook at a1, white knight at b1, white queen at d1, white king at e1, white bishop at f1 and white rook at h1. White queenside is the only castle move available. Half move number is 1. Full move number is 21. Black to move.