Arbol en forma extensiva

[Luis José Blas Moreno Garrido]

Hola, me llamo Luis Moreno.

Soy profesor asociado en la Universidad de Alicante y actualmente estoy dando teoría de juegos. Estoy iniciándome en el latex y me gustaría hacer esta figura en latex

http://vincent-knight.com/Year_3_game_theory_course/Course_Notes/images/L07-img13.png

En realidad la necesito para ponerla dentro en un árbol de decisión que estoy haciendo. Os pongo aquí el código. Muchas gracias.

\begin{tikzpicture}[font=\footnotesize,edge from parent/.style={draw,thick}]
% 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=50mm,sibling distance=50mm]
\tikzstyle{level 2}=[level distance=40mm,sibling distance=25mm]
\tikzstyle{level 3}=[level distance=40mm,sibling distance=15mm]
% The Tree
\node(0)[hollow node]{}
child[grow=60]{node[solid node]{}
child[grow=45]{node[below right]{Stackelberg Equilibrium}
edge from parent node(m1)[above left]{$Confirm$}
}
child[grow=-45]{node[below right]{Blind Equilibrium}
edge from parent node(m2)[below left]{$Don't \ \ Confirm$}
}
edge from parent node[above left]{$Send$}
}
child[grow=-60]{node[solid node]{}
child[grow=45]{node[solid node]{}
child[grow=30]{node[below right]{$(2,-2)$} edge from parent node(n5)[above left]{$a$}}
child[grow=-30]{node[below right]{$ $} edge from parent node(n6)[below left]{$r$}}
edge from parent node(m3)[above left]{$Confirm$}
}
child[grow=-45]{node[solid node]{}
child[grow=30]{node[below right]{$(1,-1)$} edge from parent node(n7)[above left]{$a$}}
child[grow=-30]{node[below right ]{$(-1,0)$} edge from parent node(n8)[below left]{$r$}}
edge from parent node(m4)[below left]{$Don't \ \ Confirm$}
}
edge from parent node[below left]{$Don't \ \ Send$}
};
% information sets
\draw[dotted,very thick](0-1)to(0-2);
\draw[loosely dotted,very thick](0-1-1)to[out=130,in=-130](0-2-1);
\draw[densely dotted,very thick](0-1-2)to[out=130,in=-130](0-2-2);

% movers
\node[above,yshift=2] [left] at(0){1};
\foreach \x in {1,2} \node[above,yshift=2]at(0-\x){2};
\node [right] at($.5*(m1)+.5*(m2)$){1};
\node [right] at($.5*(m3)+.5*(m4)$){1};
\end{tikzpicture}