r1q1kb2/p1p2ppr/1pn2n1p/4p3/1P1p3P/P1NPPPPB/2P5/R1BK1Q1R b q - 0 16
FEN state: r1q1kb2/p1p2ppr/1pn2n1p/4p3/1P1p3P/P1NPPPPB/2P5/R1BK1Q1R b q - 0 16 ; Best move: c8a6
The current state of the chess board is: Black rook at a8, black queen at c8, black king at e8 and black bishop at f8. Black pawn at a7, black pawn at c7, black pawn at f7, black pawn at g7 and black rook at h7. Black pawn at b6, black knight at c6, black knight at f6 and black pawn at h6. Black pawn at e5. White pawn at b4, black pawn at d4 and white pawn at h4. White pawn at a3, white knight at c3, white pawn at d3, white pawn at e3, white pawn at f3, white pawn at g3 and white bishop at h3. White pawn at c2. White rook at a1, white bishop at c1, white king at d1, white queen at f1 and white rook at h1. Black queenside is the only castle move available. Half move number is 0. Full move number is 16. Black to move.