\documentclass[tikz,border=10pt]{standalone}
                        \IfFileExists{newpxtext.sty}{\usepackage{newpxtext,newpxmath}}{}
                        \linespread{1.10}
                        \usetikzlibrary{shapes}
                        \usetikzlibrary{arrows.meta}
                        \usepackage{graphicx}

                        \begin{document}

                        % TikZ code with built-in styling for game trees
% TikZ libraries required for game trees
\usetikzlibrary{shapes}
\usetikzlibrary{arrows.meta}

% Style settings for game tree formatting
\tikzset{
    every node/.append style={font=\sffamily\itshape},
    every text node part/.append style={align=center},
    node distance=1.5mm,
    thick
}

% Built-in macro definitions for game tree drawing
\newdimen\ndiam
\ndiam1.5mm
\newdimen\sqwidth
\sqwidth1.6mm
\newdimen\spx
\spx.7mm
\newdimen\spy
\spy.5mm
\newdimen\paydown
\paydown2.5ex
\newdimen\treethickn
\treethickn1.0pt
\definecolor{chancecolor}{RGB}{117,145,56}
\definecolor{playeronecolor}{RGB}{234,51,35}
\colorlet{playertwocolor}{blue}
\colorlet{playerthreecolor}{orange}
\colorlet{playerfourcolor}{purple}
\colorlet{playerfivecolor}{cyan}
\colorlet{playersixcolor}{magenta}

% Game tree content from /home/docs/checkouts/readthedocs.org/user_builds/gambitproject/checkouts/889/catalog/img/vonstengelforges2008/fig6.ef
\begin{tikzpicture}[scale=0.8
  , StealthFill/.tip={Stealth[line width=.7pt,inset=0pt,length=13pt,angle'=30]}]
% \draw [help lines, color=green] (-5,0) grid (5,-6);
\draw [line width=\treethickn,color=playeronecolor] (-6.25,-1.625) arc(90:270:0.375)
  -- (6.25,-2.375) arc(-90:90:0.375) -- cycle;
\draw [line width=\treethickn,color=playeronecolor] (-9.127,-5.646) arc(70.8:250.8:0.375)
  -- (2.127,-10.354) arc(-109.2:70.8:0.375) -- cycle;
\draw [line width=\treethickn,color=playertwocolor] (-7.999,-9.72) arc(131.6:311.6:0.375)
  -- (-3.001,-6.28) arc(-48.4:131.6:0.375) -- cycle;
\draw [line width=\treethickn,color=playeronecolor] (-1.883,-9.65) arc(110.9:290.9:0.375)
  -- (8.883,-6.35) arc(-69.1:110.9:0.375) -- cycle;
\draw [line width=\treethickn,color=playertwocolor] (3.947,-5.681) arc(58.4:238.4:0.375)
  -- (10.053,-10.319) arc(-121.6:58.4:0.375) -- cycle;
%% player 1 name 1
\def\playerone{1}
%% player 2 name 2
\def\playertwo{2}
%% level -2.0 node 1 player 2
\draw [line width=\treethickn] (0,2)
   ;
%% level 2.0 node 1 xshift -6.25 from -2.0,1 move a
\draw [line width=\treethickn,color=playertwocolor] (-6.25,-2)
   -- (0,2);
\draw (-3.125,0) node[left,xshift=-0.5mm,color=playertwocolor] {a\strut};
%% level 6.0 node 1 xshift -3.0 from 2.0,1 move L
\draw [line width=\treethickn,color=playeronecolor] (-9.25,-6)
   -- (-6.25,-2);
\draw (-7.75,-4) node[left,xshift=-0.5mm,color=playeronecolor] {L\strut};
%% level 14.0 node 1 xshift -1.5 from 6.0,1 move S payoffs 0 0
\draw [line width=\treethickn,color=playeronecolor] (-10.75,-14)
   node[below,yshift=0.1\paydown,color=playeronecolor] {$\mathsf{0}\strut$}
   node[below,yshift=-0.9\paydown,color=playertwocolor] {$\mathsf{0}\strut$}
   -- (-9.25,-6);
\draw (-10,-10) node[left,xshift=-0.5mm,color=playeronecolor] {S\strut};
%% level 10.0 node 1 xshift 1.5 from 6.0,1 move T
\draw [line width=\treethickn,color=playeronecolor] (-7.75,-10)
   -- (-9.25,-6);
\draw (-8.5,-8) node[right,xshift=0.5mm,color=playeronecolor] {T\strut};
%% level 14.0 node 2 xshift -1.0 from 10.0,1 move c payoffs 0 0
\draw [line width=\treethickn,color=playertwocolor] (-8.75,-14)
   node[below,yshift=0.1\paydown,color=playeronecolor] {$\mathsf{0}\strut$}
   node[below,yshift=-0.9\paydown,color=playertwocolor] {$\mathsf{0}\strut$}
   -- (-7.75,-10);
\draw (-8.25,-12) node[left,xshift=-0.5mm,color=playertwocolor] {c\strut};
%% level 14.0 node 3 xshift 1.0 from 10.0,1 move d payoffs 0 0
\draw [line width=\treethickn,color=playertwocolor] (-6.75,-14)
   node[below,yshift=0.1\paydown,color=playeronecolor] {$\mathsf{0}\strut$}
   node[below,yshift=-0.9\paydown,color=playertwocolor] {$\mathsf{0}\strut$}
   -- (-7.75,-10);
\draw (-7.25,-12) node[right,xshift=0.5mm,color=playertwocolor] {d\strut};
%% level 6.0 node 2 xshift 3.0 from 2.0,1 move R
\draw [line width=\treethickn,color=playeronecolor] (-3.25,-6)
   -- (-6.25,-2);
\draw (-4.75,-4) node[right,xshift=0.5mm,color=playeronecolor] {R\strut};
%% level 14.0 node 4 xshift -1.5 from 6.0,2 move c payoffs 0 0
\draw [line width=\treethickn,color=playertwocolor] (-4.75,-14)
   node[below,yshift=0.1\paydown,color=playeronecolor] {$\mathsf{0}\strut$}
   node[below,yshift=-0.9\paydown,color=playertwocolor] {$\mathsf{0}\strut$}
   -- (-3.25,-6);
\draw (-4,-10) node[left,xshift=-0.5mm,color=playertwocolor] {c\strut};
%% level 10.0 node 2 xshift 1.5 from 6.0,2 move d
\draw [line width=\treethickn,color=playertwocolor] (-1.75,-10)
   -- (-3.25,-6);
\draw (-2.5,-8) node[right,xshift=0.5mm,color=playertwocolor] {d\strut};
%% level 14.0 node 5 xshift -1.0 from 10.0,2 move U payoffs 0 0
\draw [line width=\treethickn,color=playeronecolor] (-2.75,-14)
   node[below,yshift=0.1\paydown,color=playeronecolor] {$\mathsf{0}\strut$}
   node[below,yshift=-0.9\paydown,color=playertwocolor] {$\mathsf{0}\strut$}
   -- (-1.75,-10);
\draw (-2.25,-12) node[left,xshift=-0.5mm,color=playeronecolor] {U\strut};
%% level 14.0 node 6 xshift 1.0 from 10.0,2 move V payoffs 0 0
\draw [line width=\treethickn,color=playeronecolor] (-0.75,-14)
   node[below,yshift=0.1\paydown,color=playeronecolor] {$\mathsf{0}\strut$}
   node[below,yshift=-0.9\paydown,color=playertwocolor] {$\mathsf{0}\strut$}
   -- (-1.75,-10);
\draw (-1.25,-12) node[right,xshift=0.5mm,color=playeronecolor] {V\strut};
%% level 2.0 node 2 xshift 6.25 from -2.0,1 move b
\draw [line width=\treethickn,color=playertwocolor] (6.25,-2)
   -- (0,2);
\draw (3.125,0) node[right,xshift=0.5mm,color=playertwocolor] {b\strut};
%% level 6.0 node 3 xshift -2.5 from 2.0,2 move L
\draw [line width=\treethickn,color=playeronecolor] (3.75,-6)
   -- (6.25,-2);
\draw (5,-4) node[left,xshift=-0.5mm,color=playeronecolor] {L\strut};
%% level 10.0 node 3 xshift -1.5 from 6.0,3 move e
\draw [line width=\treethickn,color=playertwocolor] (2.25,-10)
   -- (3.75,-6);
\draw (3,-8) node[left,xshift=-0.5mm,color=playertwocolor] {e\strut};
%% level 14.0 node 7 xshift -1.0 from 10.0,3 move S payoffs 0 0
\draw [line width=\treethickn,color=playeronecolor] (1.25,-14)
   node[below,yshift=0.1\paydown,color=playeronecolor] {$\mathsf{0}\strut$}
   node[below,yshift=-0.9\paydown,color=playertwocolor] {$\mathsf{0}\strut$}
   -- (2.25,-10);
\draw (1.75,-12) node[left,xshift=-0.5mm,color=playeronecolor] {S\strut};
%% level 14.0 node 8 xshift 1.0 from 10.0,3 move T payoffs 0 0
\draw [line width=\treethickn,color=playeronecolor] (3.25,-14)
   node[below,yshift=0.1\paydown,color=playeronecolor] {$\mathsf{0}\strut$}
   node[below,yshift=-0.9\paydown,color=playertwocolor] {$\mathsf{0}\strut$}
   -- (2.25,-10);
\draw (2.75,-12) node[right,xshift=0.5mm,color=playeronecolor] {T\strut};
%% level 14.0 node 9 xshift 1.5 from 6.0,3 move f payoffs 0 0
\draw [line width=\treethickn,color=playertwocolor] (5.25,-14)
   node[below,yshift=0.1\paydown,color=playeronecolor] {$\mathsf{0}\strut$}
   node[below,yshift=-0.9\paydown,color=playertwocolor] {$\mathsf{0}\strut$}
   -- (3.75,-6);
\draw (4.5,-10) node[right,xshift=0.5mm,color=playertwocolor] {f\strut};
%% level 6.0 node 4 xshift 2.5 from 2.0,2 move R
\draw [line width=\treethickn,color=playeronecolor] (8.75,-6)
   -- (6.25,-2);
\draw (7.5,-4) node[right,xshift=0.5mm,color=playeronecolor] {R\strut};
%% level 14.0 node 10 xshift -1.5 from 6.0,4 move U payoffs 0 0
\draw [line width=\treethickn,color=playeronecolor] (7.25,-14)
   node[below,yshift=0.1\paydown,color=playeronecolor] {$\mathsf{0}\strut$}
   node[below,yshift=-0.9\paydown,color=playertwocolor] {$\mathsf{0}\strut$}
   -- (8.75,-6);
\draw (8,-10) node[left,xshift=-0.5mm,color=playeronecolor] {U\strut};
%% level 10.0 node 4 xshift 1.5 from 6.0,4 move V
\draw [line width=\treethickn,color=playeronecolor] (10.25,-10)
   -- (8.75,-6);
\draw (9.5,-8) node[right,xshift=0.5mm,color=playeronecolor] {V\strut};
%% level 14.0 node 11 xshift -1.0 from 10.0,4 move e payoffs 0 0
\draw [line width=\treethickn,color=playertwocolor] (9.25,-14)
   node[below,yshift=0.1\paydown,color=playeronecolor] {$\mathsf{0}\strut$}
   node[below,yshift=-0.9\paydown,color=playertwocolor] {$\mathsf{0}\strut$}
   -- (10.25,-10);
\draw (9.75,-12) node[left,xshift=-0.5mm,color=playertwocolor] {e\strut};
%% level 14.0 node 12 xshift 1.0 from 10.0,4 move f payoffs 0 0
\draw [line width=\treethickn,color=playertwocolor] (11.25,-14)
   node[below,yshift=0.1\paydown,color=playeronecolor] {$\mathsf{0}\strut$}
   node[below,yshift=-0.9\paydown,color=playertwocolor] {$\mathsf{0}\strut$}
   -- (10.25,-10);
\draw (10.75,-12) node[right,xshift=0.5mm,color=playertwocolor] {f\strut};
%% iset 2.0,1 2.0,2 player 1
%% iset 6.0,1 10.0,3 player 1
%% iset 10.0,1 6.0,2 player 2
%% iset 10.0,2 6.0,4 player 1
%% iset 6.0,3 10.0,4 player 2
\node[inner sep=0pt,minimum size=\ndiam,draw=playertwocolor,fill=playertwocolor,shape=circle] at (0,2) {};
\node[inner sep=0pt,minimum size=\ndiam,draw=playeronecolor,fill=playeronecolor,shape=circle] at (-6.25,-2) {};
\node[inner sep=0pt,minimum size=\ndiam,draw=playeronecolor,fill=playeronecolor,shape=circle] at (-9.25,-6) {};
\node[inner sep=0pt,minimum size=\ndiam,draw=playertwocolor,fill=playertwocolor,shape=circle] at (-7.75,-10) {};
\node[inner sep=0pt,minimum size=\ndiam,draw=playertwocolor,fill=playertwocolor,shape=circle] at (-3.25,-6) {};
\node[inner sep=0pt,minimum size=\ndiam,draw=playeronecolor,fill=playeronecolor,shape=circle] at (-1.75,-10) {};
\node[inner sep=0pt,minimum size=\ndiam,draw=playeronecolor,fill=playeronecolor,shape=circle] at (6.25,-2) {};
\node[inner sep=0pt,minimum size=\ndiam,draw=playertwocolor,fill=playertwocolor,shape=circle] at (3.75,-6) {};
\node[inner sep=0pt,minimum size=\ndiam,draw=playeronecolor,fill=playeronecolor,shape=circle] at (2.25,-10) {};
\node[inner sep=0pt,minimum size=\ndiam,draw=playeronecolor,fill=playeronecolor,shape=circle] at (8.75,-6) {};
\node[inner sep=0pt,minimum size=\ndiam,draw=playertwocolor,fill=playertwocolor,shape=circle] at (10.25,-10) {};

% Player color legend
\begin{scope}[scale=1,shift={(-12.25,2.0)}]
\node[inner sep=0pt,minimum size=\ndiam,draw=playeronecolor,fill=playeronecolor,shape=circle] at (0,0) {};
\node[anchor=west] at (0.3,0) {1};
\node[inner sep=0pt,minimum size=\ndiam,draw=playertwocolor,fill=playertwocolor,shape=circle] at (0,-0.625) {};
\node[anchor=west] at (0.3,-0.625) {2};
\end{scope}

\end{tikzpicture}

                        \end{document}