rnb1k1r1/3pNpp1/qp6/p6p/1B1p4/1PP5/P3PPPn/RQ1K1BNR b q - 0 16
FEN state: rnb1k1r1/3pNpp1/qp6/p6p/1B1p4/1PP5/P3PPPn/RQ1K1BNR b q - 0 16 ; Best move: a5b4
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8, black king at e8 and black rook at g8. Black pawn at d7, white knight at e7, black pawn at f7 and black pawn at g7. Black queen at a6 and black pawn at b6. Black pawn at a5 and black pawn at h5. White bishop at b4 and black pawn at d4. White pawn at b3 and white pawn at c3. White pawn at a2, white pawn at e2, white pawn at f2, white pawn at g2 and black knight at h2. White rook at a1, white queen at b1, white king at d1, white bishop at f1, white knight at g1 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.