r1b3rn/p1ppk1p1/3b3p/np1Qp1P1/1P2Pp1P/2P4R/P2P2P1/RNB1KBN1 b Q - 1 20
FEN state: r1b3rn/p1ppk1p1/3b3p/np1Qp1P1/1P2Pp1P/2P4R/P2P2P1/RNB1KBN1 b Q - 1 20 ; Best move: c8b7
The current state of the chess board is: Black rook at a8, black bishop at c8, black rook at g8 and black knight at h8. Black pawn at a7, black pawn at c7, black pawn at d7, black king at e7 and black pawn at g7. Black bishop at d6 and black pawn at h6. Black knight at a5, black pawn at b5, white queen at d5, black pawn at e5 and white pawn at g5. White pawn at b4, white pawn at e4, black pawn at f4 and white pawn at h4. White pawn at c3 and white rook at h3. White pawn at a2, white pawn at d2 and white pawn at g2. White rook at a1, white knight at b1, white bishop at c1, white king at e1, white bishop at f1 and white knight at g1. White queenside is the only castle move available. Half move number is 1. Full move number is 20. Black to move.