r3k1n1/pb1pb1r1/1pn1pp2/1N4pP/1pPPP3/3Q1P1B/PB5P/R2q1KNR w q - 10 18
FEN state: r3k1n1/pb1pb1r1/1pn1pp2/1N4pP/1pPPP3/3Q1P1B/PB5P/R2q1KNR w q - 10 18 ; Best move: a1d1
The current state of the chess board is: Black rook at a8, black king at e8 and black knight at g8. Black pawn at a7, black bishop at b7, black pawn at d7, black bishop at e7 and black rook at g7. Black pawn at b6, black knight at c6, black pawn at e6 and black pawn at f6. White knight at b5, black pawn at g5 and white pawn at h5. Black pawn at b4, white pawn at c4, white pawn at d4 and white pawn at e4. White queen at d3, white pawn at f3 and white bishop at h3. White pawn at a2, white bishop at b2 and white pawn at h2. White rook at a1, black queen at d1, white king at f1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 10. Full move number is 18. White to move.