rn2kr2/4bpp1/pqp1bp1p/Qp1p2B1/3P4/1PP4N/P1K1PPPP/3R1BR1 b q - 0 16
FEN state: rn2kr2/4bpp1/pqp1bp1p/Qp1p2B1/3P4/1PP4N/P1K1PPPP/3R1BR1 b q - 0 16 ; Best move: b6a5
The current state of the chess board is: Black rook at a8, black knight at b8, black king at e8 and black rook at f8. Black bishop at e7, black pawn at f7 and black pawn at g7. Black pawn at a6, black queen at b6, black pawn at c6, black bishop at e6, black pawn at f6 and black pawn at h6. White queen at a5, black pawn at b5, black pawn at d5 and white bishop at g5. White pawn at d4. White pawn at b3, white pawn at c3 and white knight at h3. White pawn at a2, white king at c2, white pawn at e2, white pawn at f2, white pawn at g2 and white pawn at h2. White rook at d1, white bishop at f1 and white rook at g1. Black queenside is the only castle move available. Half move number is 0. Full move number is 16. Black to move.