r2k3r/pb3pp1/2p2n1n/1p2q2p/PPQp1p1P/3P2P1/1B2P3/R3KBNR b K - 0 21
FEN state: r2k3r/pb3pp1/2p2n1n/1p2q2p/PPQp1p1P/3P2P1/1B2P3/R3KBNR b K - 0 21 ; Best move: b5c4
The current state of the chess board is: Black rook at a8, black king at d8 and black rook at h8. Black pawn at a7, black bishop at b7, black pawn at f7 and black pawn at g7. Black pawn at c6, black knight at f6 and black knight at h6. Black pawn at b5, black queen at e5 and black pawn at h5. White pawn at a4, white pawn at b4, white queen at c4, black pawn at d4, black pawn at f4 and white pawn at h4. White pawn at d3 and white pawn at g3. White bishop at b2 and white pawn at e2. White rook at a1, white king at e1, white bishop at f1, white knight at g1 and white rook at h1. White kingside is the only castle move available. Half move number is 0. Full move number is 21. Black to move.