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 \begin{figure}[htbp]
\begin{center}
% macro for inputing payoff vectors
 \newcommand{\payoff}[4][below]{\node[#1]at(#2){$(#3,#4)$};}

\begin{tikzpicture}[scale=1,font=\footnotesize]
  % Two node styles: solid and hollow
  \tikzstyle{solid node}=[circle,draw,inner sep=1.2,fill=black];
   \tikzstyle{hollow node}=[circle,draw,inner sep=1.2];
  % Specify spacing for each level of the tree
   \tikzstyle{level 1}=[level distance=15mm,sibling distance=55mm]
   \tikzstyle{level 2}=[level distance=15mm,sibling distance=30mm]
    \tikzstyle{level 3}=[level distance=15mm,sibling distance=15mm]
      \tikzstyle{level 4}=[level distance=15mm,sibling distance=15mm]
  % The Tree
\node(0)[solid node]{}
   child{node(1)[solid node]{}
     child{node[solid node]{}
     child{node[hollow node]{}edge from parent node[left]{$F$}}
      child{node[hollow node]{}edge from parent node[right]{$G$}}
      edge from parent node[left]{$D$}
     }
      child{node[solid node]{}
       child{node[hollow node]{}edge from parent node[left]{$F$}}
        child{node[hollow node]{}edge from parent node[right]{$G$}}
        edge from parent node[right]{$E$}
}
      edge from parent node[left,xshift=-5]{$C$}
    }
child{node(2)[solid node]{}
      child{node[solid node]{}
       child{node[hollow node]{}edge from parent node[left]{$F$}}
        child{node[hollow node]{}edge from parent node[right]{$G$}}
        edge from parent node[left]{$D$}
      }
      child{node[solid node]{}
        child{node[hollow node]{}edge from parent node[left]{$F$}}
        child{node[hollow node]{}edge from parent node[right]{$G$}}
        edge from parent node[right]{$E$}
}
      edge from parent node[right,xshift=5]{$D$}
      };
   information set
  \draw[dashed,rounded corners=7]($(1-1)+(-.2,.25)$)rectangle($(1-2)+(.2,-.25)$);
    \draw[dashed,rounded corners=7]($(2-1)+(-.2,.25)$)rectangle($(2-2)+(.2,-.25)$);
 \draw[dashed,rounded corners=10]($(1) + (-.2,.25)$)rectangle($(2) +(.2,-.25)$);
 specify movers
  \node[above]at(0){$P1$};
   \node at ($(1)!.5!(2)$) {$Spieler B$};
 \node at ($.5*(1-1)+.5*(1-2)$) {$P1$};
  \node at ($.5*(2-1)+.5*(2-2)$) {$P1$}
  
;
  % payoffs
 \payoff{1-1-1}ab
 \payoff{1-1-2}cd
 \payoff{1-2-1}ef
 \payoff{1-2-2}gh
  \payoff{2-1-1}ij
  \payoff{2-1-2}k{\ell}
  \payoff{2-2-1}mn
 \payoff{2-2-2}op
 ;

\end{tikzpicture}
\end{center}

 \end{figure}