\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{p1rgb}{RGB}{0,127,255}
\definecolor{p2rgb}{RGB}{221,121,224}

% Game tree content from /home/docs/checkouts/readthedocs.org/user_builds/gambitproject/checkouts/stable/catalog/img/books/shohamleytonbrown2008/fig5_10.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,draw=none,color=p1rgb,fill=p1rgb,fill opacity=0.2] (-4.5,-5.625) arc(90:270:0.375)
  -- (-0.5,-6.375) arc(-90:90:0.375) -- cycle;
%% player 1 name 1
\def\playerone{1}
%% player 2 name 2
\def\playertwo{2}
%% level -2.0 node 1 player 1
\draw [line width=\treethickn] (0,2)
   ;
%% level 2.0 node 2 player 2 xshift -2.5 from 1 move L
\draw [line width=\treethickn,color=p1rgb] (-2.5,-2)
   -- (0,2);
\draw (-1.25,0) node[left,xshift=-0.5mm,color=p1rgb] {L\strut};
%% level 6.0 node 3 xshift -2.0 from 2 move A
\draw [line width=\treethickn,color=p2rgb] (-4.5,-6)
   -- (-2.5,-2);
\draw (-3.5,-4) node[left,xshift=-0.5mm,color=p2rgb] {A\strut};
%% level 10.0 node 4 xshift -1.0 from 3 move l payoffs 0 0
\draw [line width=\treethickn,color=p1rgb] (-5.5,-10)
   node[below,yshift=0.1\paydown,color=p1rgb] {$\mathsf{0}\strut$}
   node[below,yshift=-0.9\paydown,color=p2rgb] {$\mathsf{0}\strut$}
   -- (-4.5,-6);
\draw (-5,-8) node[left,xshift=-0.5mm,color=p1rgb] {l\strut};
%% level 10.0 node 5 xshift 1.0 from 3 move r payoffs 2 4
\draw [line width=\treethickn,color=p1rgb] (-3.5,-10)
   node[below,yshift=0.1\paydown,color=p1rgb] {$\mathsf{2}\strut$}
   node[below,yshift=-0.9\paydown,color=p2rgb] {$\mathsf{4}\strut$}
   -- (-4.5,-6);
\draw (-4,-8) node[right,xshift=0.5mm,color=p1rgb] {r\strut};
%% level 6.0 node 6 xshift 2.0 from 2 move B
\draw [line width=\treethickn,color=p2rgb] (-0.5,-6)
   -- (-2.5,-2);
\draw (-1.5,-4) node[right,xshift=0.5mm,color=p2rgb] {B\strut};
%% level 10.0 node 7 xshift -1.0 from 6 move l payoffs 4 2
\draw [line width=\treethickn,color=p1rgb] (-1.5,-10)
   node[below,yshift=0.1\paydown,color=p1rgb] {$\mathsf{4}\strut$}
   node[below,yshift=-0.9\paydown,color=p2rgb] {$\mathsf{2}\strut$}
   -- (-0.5,-6);
\draw (-1,-8) node[left,xshift=-0.5mm,color=p1rgb] {l\strut};
%% level 10.0 node 8 xshift 1.0 from 6 move r payoffs 0 0
\draw [line width=\treethickn,color=p1rgb] (0.5,-10)
   node[below,yshift=0.1\paydown,color=p1rgb] {$\mathsf{0}\strut$}
   node[below,yshift=-0.9\paydown,color=p2rgb] {$\mathsf{0}\strut$}
   -- (-0.5,-6);
\draw (0,-8) node[right,xshift=0.5mm,color=p1rgb] {r\strut};
%% level 10.0 node 9 xshift 2.5 from 1 move R payoffs 0 0
\draw [line width=\treethickn,color=p1rgb] (2.5,-10)
   node[below,yshift=0.1\paydown,color=p1rgb] {$\mathsf{0}\strut$}
   node[below,yshift=-0.9\paydown,color=p2rgb] {$\mathsf{0}\strut$}
   -- (0,2);
\draw (1.25,-4) node[right,xshift=0.5mm,color=p1rgb] {R\strut};
%% iset 3 6 player 1
\node[inner sep=0pt,minimum size=\ndiam,draw=p1rgb,fill=p1rgb,shape=circle] at (0,2) {};
\node[inner sep=0pt,minimum size=\ndiam,draw=p2rgb,fill=p2rgb,shape=circle] at (-2.5,-2) {};
\node[inner sep=0pt,minimum size=\ndiam,draw=p1rgb,fill=p1rgb,shape=circle] at (-4.5,-6) {};
\node[inner sep=0pt,minimum size=\ndiam,draw=p1rgb,fill=p1rgb,shape=circle] at (-0.5,-6) {};

% Player color legend
\begin{scope}[scale=1,shift={(-7.0,2.0)}]
\node[inner sep=0pt,minimum size=\ndiam,draw=p1rgb,fill=p1rgb,shape=circle] at (0,0) {};
\node[anchor=west] at (0.3,0) {1};
\node[inner sep=0pt,minimum size=\ndiam,draw=p2rgb,fill=p2rgb,shape=circle] at (0,-0.625) {};
\node[anchor=west] at (0.3,-0.625) {2};
\end{scope}

\end{tikzpicture}

                        \end{document}