% Tikz File 'mytikz.tex'
documentclass{standalone}
usepackage{standalone}
%usepackage[margin=1in, lmargin=1.75cm, rmargin=1.75cm]{geometry}
standaloneconfig{mode=image|tex}
usepackage{tikz}
%usetikzlibrary{...}
usetikzlibrary{decorations.pathreplacing}
usetikzlibrary{arrows.meta,calc}
begin{document}
  definecolor{light-gray}{gray}{0.98}
  definecolor{darkgreen}{RGB}{0,64,0}
  definecolor{lightgray}{gray}{0.75}
  definecolor{lightred}{RGB}{255,200,200}
  definecolor{lightblue}{RGB}{200,200,255}
  definecolor{lightgreen}{RGB}{200,255,200}
  definecolor{pink}{RGB}{255,128,128}
    begin{tikzpicture}
    %useasboundingbox(0.8,0) (4.1,4.6);
    defopacity{0.75}
    defxcellsa{{"A","B","C","D"}}

    defxcellsb{{"4","3","2","1"}}

    %bc slice
    filldraw[lightblue, opacity=0.5] (1,0) rectangle (3,4);
    draw[step=1,black, opacity=opacity, fill opacity=0] (1,0) grid (3,4);
    %23slice
    filldraw[lightblue, opacity=0.5] (0,1) rectangle (4,3);
    draw[step=1,black, opacity=opacity, fill opacity=0] (0,1) grid (4,3);
    %core
    draw[fill = white, thick, dashed] (2,2) circle (0.5cm);
    node[fill = white, opacity=1] at (2,2) {core};
    %coordinate
    draw[fill = black] (1.5,2.6) circle (0.1cm);
    node at (1.5, 2.6) (A) {};
    node at (0.8,4.4) (B) {};
    draw[-Stealth, semithick] (B) to [bend right] (A);
    node[fill=white, opacity=1] at (1,4.4) {anchor};

    foreach xa in {1,2} {
      node[align=center] at ({xa+0.5},{4-0.5}) {pgfmathparse{xcellsa[xa]}pgfmathresult};
    }
    foreach ya in {1,2} {
      node[align=center] at ({0.5},{ya+0.5}) {pgfmathparse{xcellsb[ya]}pgfmathresult};
    }
  end{tikzpicture}
end{document}