How to display black chess pieces within normal text with chessfss

There aren't many chessfonts which actually contain black figurine pieces. I only know the berlin family and there you need to change the font shape to access them:

\documentclass[varwidth,margin=0.5cm]{standalone}
\usepackage{chessfss}
\begin{document}
\pawn \rook \knight \bishop \queen \king

\setfigfontfamily{berlin}
\pawn \rook \knight \bishop \queen \king 

\fontshape{bl}\pawn \rook \knight \bishop \queen \king
\end{document}

If you want to use another chess font you will have to get suitable glyphs first. You could e.g. ask the author of skaknew to add them. I could then create support files.

Edit

You could get glyphs by taking the font with the board pieces and then create a virtual font which changes the bounding boxes so that they sit better on the line.

Since I almost don't understand anything about fonts, I have defined using adjustbox new commands which trim, resize and scale the board pieces. It is kind of an ugly workaround, I know...

\documentclass[varwidth,margin=0.5cm]{standalone}
\usepackage{chessfss}
\usepackage{adjustbox}

\newcommand{\pawnB}[1][1.3ex]{%
\adjustbox{Trim=4.3pt 2.6pt 4.3pt 0pt,width=#1,margin=0.2ex 0ex 0.2ex 0ex}{\BlackPawnOnWhite}%
}%
\newcommand{\rookB}[1][1.58ex]{%
\adjustbox{Trim=3.2pt 2.2pt 3.2pt 0pt,width=#1,raise=0ex,margin=0.1ex 0ex 0.1ex 0ex}{\BlackRookOnWhite}%
}%
\newcommand{\knightB}[1][1.85ex]{%
\adjustbox{Trim=2.3pt 2.35pt 2.5pt 0pt,width=#1,raise=-0.03ex,margin=0.14ex 0ex 0.14ex 0ex}{\BlackKnightOnWhite}%
}%
\newcommand{\bishopB}[1][1.79ex]{%
\adjustbox{Trim=2.3pt 2pt 2.3pt 0pt,width=#1,raise=-0.12ex,margin=0.1ex 0ex 0.1ex 0ex}{\BlackBishopOnWhite}%
}%
\newcommand{\queenB}[1][2.05ex]{%
\adjustbox{Trim=1.2pt 2.2pt 1.2pt 0pt,width=#1,raise=-0.08ex,margin=0.1ex 0ex 0.1ex 0ex}{\BlackQueenOnWhite}%
}%
\newcommand{\kingB}[1][1.95ex]{%
\adjustbox{Trim=2pt 2pt 2pt 0pt,width=#1,raise=-0.06ex,margin=0.13ex 0ex 0.13ex 0ex}{\BlackKingOnWhite}%
}%

\begin{document}
\pawn  \rook   \knight   \bishop   \queen  \king\\
\pawnB \rookB  \knightB  \bishopB  \queenB \kingB
\end{document}

The alpha font family has black figurines stored within \fontshape{bl}.

\documentclass{article}

\usepackage{chessfss}

\begin{document}

\setfigfontfamily{alpha}

\figfont KQRBNp

\fontshape{bl}\figfont KQRBNp

\fontshape{*}\figfont KQRBNp

\end{document}