r1bq1rn1/pQ1p2kp/5b2/4pp2/3N1PPP/1P6/Pn2P2R/R3KBB1 b Q - 0 23
FEN state: r1bq1rn1/pQ1p2kp/5b2/4pp2/3N1PPP/1P6/Pn2P2R/R3KBB1 b Q - 0 23 ; Best move: c8b7
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black rook at f8 and black knight at g8. Black pawn at a7, white queen at b7, black pawn at d7, black king at g7 and black pawn at h7. Black bishop at f6. Black pawn at e5 and black pawn at f5. White knight at d4, white pawn at f4, white pawn at g4 and white pawn at h4. White pawn at b3. White pawn at a2, black knight at b2, white pawn at e2 and white rook at h2. White rook at a1, white king at e1, white bishop at f1 and white bishop at g1. White queenside is the only castle move available. Half move number is 0. Full move number is 23. Black to move.