r3kbr1/pp4n1/n1qpb1p1/B2Bpp1p/3N1P2/2N1P1PP/P1PP4/R1QK2R1 b q - 5 21
FEN state: r3kbr1/pp4n1/n1qpb1p1/B2Bpp1p/3N1P2/2N1P1PP/P1PP4/R1QK2R1 b q - 5 21 ; Best move: c6d7
The current state of the chess board is: Black rook at a8, black king at e8, black bishop at f8 and black rook at g8. Black pawn at a7, black pawn at b7 and black knight at g7. Black knight at a6, black queen at c6, black pawn at d6, black bishop at e6 and black pawn at g6. White bishop at a5, white bishop at d5, black pawn at e5, black pawn at f5 and black pawn at h5. White knight at d4 and white pawn at f4. White knight at c3, white pawn at e3, white pawn at g3 and white pawn at h3. White pawn at a2, white pawn at c2 and white pawn at d2. White rook at a1, white queen at c1, white king at d1 and white rook at g1. Black queenside is the only castle move available. Half move number is 5. Full move number is 21. Black to move.