r1b1k2r/3n1p2/Rqp4p/1P1p2p1/1b2P2P/3P4/3P1PPR/1NB1K1N1 b k - 0 21
FEN state: r1b1k2r/3n1p2/Rqp4p/1P1p2p1/1b2P2P/3P4/3P1PPR/1NB1K1N1 b k - 0 21 ; Best move: c8a6
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8 and black rook at h8. Black knight at d7 and black pawn at f7. White rook at a6, black queen at b6, black pawn at c6 and black pawn at h6. White pawn at b5, black pawn at d5 and black pawn at g5. Black bishop at b4, white pawn at e4 and white pawn at h4. White pawn at d3. White pawn at d2, white pawn at f2, white pawn at g2 and white rook at h2. White knight at b1, white bishop at c1, white king at e1 and white knight at g1. Black kingside is the only castle move available. Half move number is 0. Full move number is 21. Black to move.