r2q1bn1/pb3k1r/2n2p2/1P1pB1p1/5PPp/QP1N3P/P2PP2R/RN2KB2 b Q - 0 21
FEN state: r2q1bn1/pb3k1r/2n2p2/1P1pB1p1/5PPp/QP1N3P/P2PP2R/RN2KB2 b Q - 0 21 ; Best move: f8a3
The current state of the chess board is: Black rook at a8, black queen at d8, black bishop at f8 and black knight at g8. Black pawn at a7, black bishop at b7, black king at f7 and black rook at h7. Black knight at c6 and black pawn at f6. White pawn at b5, black pawn at d5, white bishop at e5 and black pawn at g5. White pawn at f4, white pawn at g4 and black pawn at h4. White queen at a3, white pawn at b3, white knight at d3 and white pawn at h3. White pawn at a2, white pawn at d2, white pawn at e2 and white rook at h2. White rook at a1, white knight at b1, white king at e1 and white bishop at f1. White queenside is the only castle move available. Half move number is 0. Full move number is 21. Black to move.