r2qkbr1/p1pp1ppp/1pn2n2/1N6/2PPp2P/6Q1/P3PPP1/R1BK1BNR b q - 0 13
FEN state: r2qkbr1/p1pp1ppp/1pn2n2/1N6/2PPp2P/6Q1/P3PPP1/R1BK1BNR b q - 0 13 ; Best move: a8c8
The current state of the chess board is: Black rook at a8, black queen at d8, black king at e8, black bishop at f8 and black rook at g8. Black pawn at a7, black pawn at c7, black pawn at d7, black pawn at f7, black pawn at g7 and black pawn at h7. Black pawn at b6, black knight at c6 and black knight at f6. White knight at b5. White pawn at c4, white pawn at d4, black pawn at e4 and white pawn at h4. White queen at g3. White pawn at a2, white pawn at e2, white pawn at f2 and white pawn at g2. White rook at a1, white bishop at c1, white king at d1, 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 0. Full move number is 13. Black to move.