r2qkb2/pb2n3/npp1p3/3p1prp/P2PPN1p/1PPQ1PP1/3K4/RNB2R2 w q - 2 18
FEN state: r2qkb2/pb2n3/npp1p3/3p1prp/P2PPN1p/1PPQ1PP1/3K4/RNB2R2 w q - 2 18 ; Best move: f4e6
The current state of the chess board is: Black rook at a8, black queen at d8, black king at e8 and black bishop at f8. Black pawn at a7, black bishop at b7 and black knight at e7. Black knight at a6, black pawn at b6, black pawn at c6 and black pawn at e6. Black pawn at d5, black pawn at f5, black rook at g5 and black pawn at h5. White pawn at a4, white pawn at d4, white pawn at e4, white knight at f4 and black pawn at h4. White pawn at b3, white pawn at c3, white queen at d3, white pawn at f3 and white pawn at g3. White king at d2. White rook at a1, white knight at b1, white bishop at c1 and white rook at f1. Black queenside is the only castle move available. Half move number is 2. Full move number is 18. White to move.