\begin{figure}[htb]
\centering
\begin{tikzpicture}

\draw (0,0) -- (2,1) node[anchor=west] {$B_1$};
\draw (2.6,1) -- (4.6,1.25) node[anchor=west] {$B_2$};
\draw (2.6,1) -- (4.6,0.75) node[anchor=west] {$B_3$};
\draw (5.2,1.25) -- (7.2,1.25) node[anchor=west] {$B_3$};
\draw (5.2,0.75) -- (7.2,0.75) node[anchor=west] {$B_2$};


\draw (0,0) -- (2,0) node[anchor=west] {$B_2$};
\draw (2.6,0) -- (4.6,0.25) node[anchor=west] {$B_1$};
\draw (2.6,0) -- (4.6,-0.25) node[anchor=west] {$B_3$};
\draw (5.2,0.25) -- (7.2,0.25) node[anchor=west] {$B_3$};
\draw (5.2,-0.25) -- (7.2,-0.25) node[anchor=west] {$B_1$};

\draw (0,0) -- (2,-1) node[anchor=west] {$B_3$};
\draw (2.6,-1) -- (4.6,-0.75) node[anchor=west] {$B_1$};
\draw (2.6,-1) -- (4.6,-1.25) node[anchor=west] {$B_2$};
\draw (5.2,-0.75) -- (7.2,-0.75) node[anchor=west] {$B_2$};
\draw (5.2,-1.25) -- (7.2,-1.25) node[anchor=west] {$B_1$};

\node (P1) at (2.3,-1.85) {1. Platz};
\node (P2) at (4.9,-1.85) {2. Platz};
\node (P3) at (7.4,-1.85) {3. Platz};

\end{tikzpicture}
\caption{Platzierungsmöglichkeiten der drei Bücher $B_{1}, B_{2}, B_{3}$}
\end{figure}