1nb1kb1r/Np2pnp1/1q1p4/pr3p1p/PPP2P1P/6P1/3PP2R/RNBQKB2 w k - 1 18
FEN state: 1nb1kb1r/Np2pnp1/1q1p4/pr3p1p/PPP2P1P/6P1/3PP2R/RNBQKB2 w k - 1 18 ; Best move: a7c8
The current state of the chess board is: Black knight at b8, black bishop at c8, black king at e8, black bishop at f8 and black rook at h8. White knight at a7, black pawn at b7, black pawn at e7, black knight at f7 and black pawn at g7. Black queen at b6 and black pawn at d6. Black pawn at a5, black rook at b5, black pawn at f5 and black pawn at h5. White pawn at a4, white pawn at b4, white pawn at c4, white pawn at f4 and white pawn at h4. White pawn at g3. White pawn at d2, white pawn at e2 and white rook at h2. White rook at a1, white knight at b1, white bishop at c1, 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 18. White to move.