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\begin{tikzpicture}[ scale=1.0, fine/.style={circle,draw=black,thick,inner sep=2}, ] \draw[step=1.0,black] (0.75,0.75) grid (6.25,6.25); \draw[step=0.5,gray,thin,xshift=1.75cm,yshift=1.75cm] (0,0) grid (3.5,3.5); \foreach \x in {0,...,7} \foreach \y in {0,...,7} \node[fine] at (1.75+0.5*\x,1.75+0.5*\y){ }; \end{tikzpicture}