I would really like to draw a table like on the photo. Everything I have tried does not work. Maybe I do something wrong right at the beginning. I only got the table you can see in the code below. There is still a lot to do for getting a table like on the photo. But I just do not understand how to get there. It is all new for me and I hope you are not angry about the question. (and sorry for my bad English). Thank you for your help!
\documentclass[a4paper, fontsize=11pt]{scrbook}
\usepackage{geometry} \geometry{a4paper, top=25mm, left=25mm, right=25mm, bottom=20mm, headsep=10mm, footskip=12mm}
\usepackage[ngerman]{babel}
\usepackage[T1]{fontenc}
\usepackage[latin1]{inputenc}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{multirow,array}
\usepackage{arydshln}
\dashlinegap=1pt
\usepackage{acronym}
\begin{document}
\begin{table}
\renewcommand\arraystretch{1.5}
\begin{tabular}{*{5}{>{$}c<{$}|}}
\multicolumn{2}{c}{} & \multicolumn{3}{c}{Spieler 2} \\ \cline{3-5}
\multicolumn{1}{c}{} & & s_{21} & s_{22} & s_{23} \\ \cline{2-5}
\multirow{3}*{Spieler 1}
& s_{11} & 1 & 6 & 0 \\ \cline{2-5}
& s_{12} & 2 & 0 & 3 \\ \cline{2-5}
& s_{12} & 3 & 2 & 4 \\ \cline{2-5}
\end{tabular}
\end{table}
\end{document}