r2q1knr/pp2bp2/1nBN2pp/2p2b2/6PP/2NP1P2/PPP1P3/R1BQKR2 w Q - 1 17
FEN state: r2q1knr/pp2bp2/1nBN2pp/2p2b2/6PP/2NP1P2/PPP1P3/R1BQKR2 w Q - 1 17 ; Best move: d6b7
The current state of the chess board is: Black rook at a8, black queen at d8, black king at f8, black knight at g8 and black rook at h8. Black pawn at a7, black pawn at b7, black bishop at e7 and black pawn at f7. Black knight at b6, white bishop at c6, white knight at d6, black pawn at g6 and black pawn at h6. Black pawn at c5 and black bishop at f5. White pawn at g4 and white pawn at h4. White knight at c3, white pawn at d3 and white pawn at f3. White pawn at a2, white pawn at b2, white pawn at c2 and white pawn at e2. White rook at a1, white bishop at c1, white queen at d1, white king at e1 and white rook at f1. White queenside is the only castle move available. Half move number is 1. Full move number is 17. White to move.