1nbqkbnr/3p2p1/r3p3/pP2B3/RPp2P1p/8/2PPP1RP/1N1QKB2 b k - 1 13
FEN state: 1nbqkbnr/3p2p1/r3p3/pP2B3/RPp2P1p/8/2PPP1RP/1N1QKB2 b k - 1 13 ; Best move: a6a8
The current state of the chess board is: Black knight at b8, black bishop at c8, black queen at d8, black king at e8, black bishop at f8, black knight at g8 and black rook at h8. Black pawn at d7 and black pawn at g7. Black rook at a6 and black pawn at e6. Black pawn at a5, white pawn at b5 and white bishop at e5. White rook at a4, white pawn at b4, black pawn at c4, white pawn at f4 and black pawn at h4. White pawn at c2, white pawn at d2, white pawn at e2, white rook at g2 and white pawn at h2. White knight at b1, white queen at d1, white king at e1 and white bishop at f1. Black kingside is the only castle move available. Half move number is 1. Full move number is 13. Black to move.