r2k1br1/p1p1p2p/nB3q1n/Np4p1/PPBp1pP1/2P1P2b/3PNP1P/RQ2K1R1 b Q - 4 17
FEN state: r2k1br1/p1p1p2p/nB3q1n/Np4p1/PPBp1pP1/2P1P2b/3PNP1P/RQ2K1R1 b Q - 4 17 ; Best move: b5c4
The current state of the chess board is: Black rook at a8, black king at d8, black bishop at f8 and black rook at g8. Black pawn at a7, black pawn at c7, black pawn at e7 and black pawn at h7. Black knight at a6, white bishop at b6, black queen at f6 and black knight at h6. White knight at a5, black pawn at b5 and black pawn at g5. White pawn at a4, white pawn at b4, white bishop at c4, black pawn at d4, black pawn at f4 and white pawn at g4. White pawn at c3, white pawn at e3 and black bishop at h3. White pawn at d2, white knight at e2, white pawn at f2 and white pawn at h2. White rook at a1, white queen at b1, white king at e1 and white rook at g1. White queenside is the only castle move available. Half move number is 4. Full move number is 17. Black to move.