r1b1k1n1/pp2ppbr/n2p3p/1qp3p1/2Q2NP1/P1P1KP2/1P1PP2P/RNB2B1R b q - 4 16
FEN state: r1b1k1n1/pp2ppbr/n2p3p/1qp3p1/2Q2NP1/P1P1KP2/1P1PP2P/RNB2B1R b q - 4 16 ; Best move: b5c4
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8 and black knight at g8. Black pawn at a7, black pawn at b7, black pawn at e7, black pawn at f7, black bishop at g7 and black rook at h7. Black knight at a6, black pawn at d6 and black pawn at h6. Black queen at b5, black pawn at c5 and black pawn at g5. White queen at c4, white knight at f4 and white pawn at g4. White pawn at a3, white pawn at c3, white king at e3 and white pawn at f3. White pawn at b2, white pawn at d2, white pawn at e2 and white pawn at h2. White rook at a1, white knight at b1, white bishop at c1, white bishop at f1 and white rook at h1. Black queenside is the only castle move available. Half move number is 4. Full move number is 16. Black to move.