LaTeX code for a basic extensive form game

gistfile1.txt

\documentclass{article}
\usepackage{tikz-qtree}
\usepackage{amsmath}

\tikzset{
  % Two node styles for game trees: solid and hollow
  solid node/.style={circle,draw,inner sep=2,fill=black},
  hollow node/.style={circle,draw,inner sep=2},
  empty node/.style={rectangle,draw,fill=white,color=white}
}

% macro for entering payoffs
\newcommand\payoff[1]{
  $\begin{pmatrix} #1 \end{pmatrix}$
}

\begin{document}

\begin{tikzpicture}[every level 0 node/.style={draw,hollow node},
                   every level 1 node/.style={draw,solid node},
                   every level 2 node/.style={draw,empty node},
                   every level 3 node/.style={draw, empty node},
                   grow=right,
                   level distance=.85in,
                   sibling distance=.65in,
                   edge from parent path={(\tikzparentnode) -- (\tikzchildnode)}]
                   \tikzstyle{edge from parent}=[draw,black,very thick] 
\Tree [.\node[label=left:{{1}}]{};  
        \edge node [auto=right] {D}; [.\node[label=left:2]{};
            \edge node [auto=right] {d}; [.\node [label=right:{\payoff{2, 6}}] {}; 
              ]
            \edge node [auto=left] {u}; [.\node [label=right:{\payoff{3, 6}}] {}; 
               ] ] 
        \edge node [auto=left] {U}; [.\node [rectangle,draw,fill=white,color=white,label=right:{\payoff{5, 2}}] {};] 
]]
\end{tikzpicture}
\end{document}