r1b1kbn1/3np3/p1p5/Pp1p1p2/1r1P1Rp1/6PB/2P1PP2/1NBQK2R w q - 1 21
FEN state: r1b1kbn1/3np3/p1p5/Pp1p1p2/1r1P1Rp1/6PB/2P1PP2/1NBQK2R w q - 1 21 ; Best move: c1d2
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8, black bishop at f8 and black knight at g8. Black knight at d7 and black pawn at e7. Black pawn at a6 and black pawn at c6. White pawn at a5, black pawn at b5, black pawn at d5 and black pawn at f5. Black rook at b4, white pawn at d4, white rook at f4 and black pawn at g4. White pawn at g3 and white bishop at h3. White pawn at c2, white pawn at e2 and white pawn at f2. White knight at b1, white bishop at c1, white queen at d1, white king at e1 and white rook at h1. Black queenside is the only castle move available. Half move number is 1. Full move number is 21. White to move.