r3k1r1/q3bpp1/b2p2pn/Nppnp3/4P2P/PPPP1Q2/R2BKP2/5BNR b q - 6 18
FEN state: r3k1r1/q3bpp1/b2p2pn/Nppnp3/4P2P/PPPP1Q2/R2BKP2/5BNR b q - 6 18 ; Best move: a6c8
The current state of the chess board is: Black rook at a8, black king at e8 and black rook at g8. Black queen at a7, black bishop at e7, black pawn at f7 and black pawn at g7. Black bishop at a6, black pawn at d6, black pawn at g6 and black knight at h6. White knight at a5, black pawn at b5, black pawn at c5, black knight at d5 and black pawn at e5. White pawn at e4 and white pawn at h4. White pawn at a3, white pawn at b3, white pawn at c3, white pawn at d3 and white queen at f3. White rook at a2, white bishop at d2, white king at e2 and white pawn at f2. 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 6. Full move number is 18. Black to move.