rn2k3/qb3pp1/1p3n2/p1ppp3/P3PPp1/bP1P4/1RPBQ3/1N1K1B1r w q - 1 21
FEN state: rn2k3/qb3pp1/1p3n2/p1ppp3/P3PPp1/bP1P4/1RPBQ3/1N1K1B1r w q - 1 21 ; Best move: b1a3
The current state of the chess board is: Black rook at a8, black knight at b8 and black king at e8. Black queen at a7, black bishop at b7, black pawn at f7 and black pawn at g7. Black pawn at b6 and black knight at f6. Black pawn at a5, black pawn at c5, black pawn at d5 and black pawn at e5. White pawn at a4, white pawn at e4, white pawn at f4 and black pawn at g4. Black bishop at a3, white pawn at b3 and white pawn at d3. White rook at b2, white pawn at c2, white bishop at d2 and white queen at e2. White knight at b1, white king at d1, white bishop at f1 and black rook at h1. Black queenside is the only castle move available. Half move number is 1. Full move number is 21. White to move.