c=[0.6 0.6 0.6];
fill([1 8 8 1],[1 1 8 8],'k')
hold on
for i=1:8
	plot([i i],[1 8],'color',c ,'linewidth',5)
end
for j=1:8
	plot([1 8],[j j],'color',c,'linewidth',5)
end

t=0:pi/20:2*pi;
r=0.1;
x=r*cos(t);
y=r*sin(t);

for i=2:7
	for j=2:7
		fill(x+i,y+j,'w','edgecolor','w')
	end
end

axis equal
axis off
hold off
set(gcf,'color','w')
