1nbq1b2/r1ppk3/6nr/Pp2pp1p/3PP1pP/NP3PPR/1B6/R2QKBN1 w Q - 5 17
FEN state: 1nbq1b2/r1ppk3/6nr/Pp2pp1p/3PP1pP/NP3PPR/1B6/R2QKBN1 w Q - 5 17 ; Best move: a3b5
The current state of the chess board is: Black knight at b8, black bishop at c8, black queen at d8 and black bishop at f8. Black rook at a7, black pawn at c7, black pawn at d7 and black king at e7. Black knight at g6 and black rook at h6. White pawn at a5, black pawn at b5, black pawn at e5, black pawn at f5 and black pawn at h5. White pawn at d4, white pawn at e4, black pawn at g4 and white pawn at h4. White knight at a3, white pawn at b3, white pawn at f3, white pawn at g3 and white rook at h3. White bishop at b2. White rook at a1, white queen at d1, white king at e1, white bishop at f1 and white knight at g1. White queenside is the only castle move available. Half move number is 5. Full move number is 17. White to move.