1nb1kbnr/1p3pp1/r1pq4/p6p/4P2P/2NBBP2/PPP3P1/R2Q1KNR b k - 4 12
FEN state: 1nb1kbnr/1p3pp1/r1pq4/p6p/4P2P/2NBBP2/PPP3P1/R2Q1KNR b k - 4 12 ; Best move: a6a8
The current state of the chess board is: Black knight at b8, black bishop at c8, black king at e8, black bishop at f8, black knight at g8 and black rook at h8. Black pawn at b7, black pawn at f7 and black pawn at g7. Black rook at a6, black pawn at c6 and black queen at d6. Black pawn at a5 and black pawn at h5. White pawn at e4 and white pawn at h4. White knight at c3, white bishop at d3, white bishop at e3 and white pawn at f3. White pawn at a2, white pawn at b2, white pawn at c2 and white pawn at g2. White rook at a1, white queen at d1, white king at f1, white knight at g1 and white rook at h1. Black kingside is the only castle move available. Half move number is 4. Full move number is 12. Black to move.