r1b1q1r1/1ppp1pkp/p1n1p1p1/3n4/P2PNb1P/1P2PQ2/1BP2PPR/R3KB2 w Q - 4 17
FEN state: r1b1q1r1/1ppp1pkp/p1n1p1p1/3n4/P2PNb1P/1P2PQ2/1BP2PPR/R3KB2 w Q - 4 17 ; Best move: e3f4
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at e8 and black rook at g8. Black pawn at b7, black pawn at c7, black pawn at d7, black pawn at f7, black king at g7 and black pawn at h7. Black pawn at a6, black knight at c6, black pawn at e6 and black pawn at g6. Black knight at d5. White pawn at a4, white pawn at d4, white knight at e4, black bishop at f4 and white pawn at h4. White pawn at b3, white pawn at e3 and white queen at f3. White bishop at b2, white pawn at c2, white pawn at f2, white pawn at g2 and white rook at h2. White rook at a1, white king at e1 and white bishop at f1. White queenside is the only castle move available. Half move number is 4. Full move number is 17. White to move.