r4bnr/p1qpp1p1/np2k3/1bp4p/2P1PpPP/NP3B2/PB1P1P1R/R2QK1N1 w Q - 1 15
FEN state: r4bnr/p1qpp1p1/np2k3/1bp4p/2P1PpPP/NP3B2/PB1P1P1R/R2QK1N1 w Q - 1 15 ; Best move: a3b5
The current state of the chess board is: Black rook at a8, black bishop at f8, black knight at g8 and black rook at h8. Black pawn at a7, black queen at c7, black pawn at d7, black pawn at e7 and black pawn at g7. Black knight at a6, black pawn at b6 and black king at e6. Black bishop at b5, black pawn at c5 and black pawn at h5. White pawn at c4, white pawn at e4, black pawn at f4, white pawn at g4 and white pawn at h4. White knight at a3, white pawn at b3 and white bishop at f3. White pawn at a2, white bishop at b2, white pawn at d2, white pawn at f2 and white rook at h2. White rook at a1, white queen at d1, white king at e1 and white knight at g1. White queenside is the only castle move available. Half move number is 1. Full move number is 15. White to move.