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I can't test for people's locations using @a[x=-563,y=4,z=23]. Instead, the redstone comparator will just turn on even if no one is at -563,4,23.

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Try specifying a maximum search radius, for example:

@a[x=-563,y=4,z=23,r=1]

Note that you can use this shortcut:

@a[-563,4,23,1]
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up vote -1 down vote accepted

In 1.8, it is @a[x=-563,y=4,z=23,dx=0,dy=0,dz=0]

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