rn2kbr1/1p3p1p/3p2Pn/pqp1pb2/QPP4P/N5P1/PR1PPK2/2B2BNR b q - 1 16
FEN state: rn2kbr1/1p3p1p/3p2Pn/pqp1pb2/QPP4P/N5P1/PR1PPK2/2B2BNR b q - 1 16 ; Best move: b5a4
The current state of the chess board is: Black rook at a8, black knight at b8, black king at e8, black bishop at f8 and black rook at g8. Black pawn at b7, black pawn at f7 and black pawn at h7. Black pawn at d6, white pawn at g6 and black knight at h6. Black pawn at a5, black queen at b5, black pawn at c5, black pawn at e5 and black bishop at f5. White queen at a4, white pawn at b4, white pawn at c4 and white pawn at h4. White knight at a3 and white pawn at g3. White pawn at a2, white rook at b2, white pawn at d2, white pawn at e2 and white king at f2. White bishop at c1, 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 1. Full move number is 16. Black to move.