rnb1kbnr/5q2/1p3p1p/p1pp4/PP5P/3P2P1/2PBPK2/1R1Q1BNR w q - 0 16
FEN state: rnb1kbnr/5q2/1p3p1p/p1pp4/PP5P/3P2P1/2PBPK2/1R1Q1BNR w q - 0 16 ; Best move: b4a5
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8, black king at e8, black bishop at f8, black knight at g8 and black rook at h8. Black queen at f7. Black pawn at b6, black pawn at f6 and black pawn at h6. Black pawn at a5, black pawn at c5 and black pawn at d5. White pawn at a4, white pawn at b4 and white pawn at h4. White pawn at d3 and white pawn at g3. White pawn at c2, white bishop at d2, white pawn at e2 and white king at f2. White rook at b1, white queen at d1, white bishop at f1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 0. Full move number is 16. White to move.