r1bq1br1/p1p2kn1/n2pp2p/1p3ppP/B2N1PP1/4P3/PPPP3R/RNB1KQ2 w Q - 0 16
FEN state: r1bq1br1/p1p2kn1/n2pp2p/1p3ppP/B2N1PP1/4P3/PPPP3R/RNB1KQ2 w Q - 0 16 ; Best move: a4b5
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black bishop at f8 and black rook at g8. Black pawn at a7, black pawn at c7, black king at f7 and black knight at g7. Black knight at a6, black pawn at d6, black pawn at e6 and black pawn at h6. Black pawn at b5, black pawn at f5, black pawn at g5 and white pawn at h5. White bishop at a4, white knight at d4, white pawn at f4 and white pawn at g4. White pawn at e3. White pawn at a2, white pawn at b2, white pawn at c2, white pawn at d2 and white rook at h2. White rook at a1, white knight at b1, white bishop at c1, white king at e1 and white queen at f1. White queenside is the only castle move available. Half move number is 0. Full move number is 16. White to move.