r1q2bn1/1ppnk1p1/3p1p1r/1P5p/2PPpB1P/Q4N2/P3bPPR/RN2KB2 w Q - 4 16
FEN state: r1q2bn1/1ppnk1p1/3p1p1r/1P5p/2PPpB1P/Q4N2/P3bPPR/RN2KB2 w Q - 4 16 ; Best move: a3e3
The current state of the chess board is: Black rook at a8, black queen at c8, black bishop at f8 and black knight at g8. Black pawn at b7, black pawn at c7, black knight at d7, black king at e7 and black pawn at g7. Black pawn at d6, black pawn at f6 and black rook at h6. White pawn at b5 and black pawn at h5. White pawn at c4, white pawn at d4, black pawn at e4, white bishop at f4 and white pawn at h4. White queen at a3 and white knight at f3. White pawn at a2, black bishop at e2, white pawn at f2, white pawn at g2 and white rook at h2. White rook at a1, white knight at b1, 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 16. White to move.