r1b1k1n1/p6r/4ppp1/1p2b2p/5NPP/PP1PP3/RnPK4/1N3B1R b q - 5 21
FEN state: r1b1k1n1/p6r/4ppp1/1p2b2p/5NPP/PP1PP3/RnPK4/1N3B1R b q - 5 21 ; Best move: c8b7
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8 and black knight at g8. Black pawn at a7 and black rook at h7. Black pawn at e6, black pawn at f6 and black pawn at g6. Black pawn at b5, black bishop at e5 and black pawn at h5. White knight at f4, white pawn at g4 and white pawn at h4. White pawn at a3, white pawn at b3, white pawn at d3 and white pawn at e3. White rook at a2, black knight at b2, white pawn at c2 and white king at d2. White knight at b1, white bishop at f1 and white rook at h1. Black queenside is the only castle move available. Half move number is 5. Full move number is 21. Black to move.