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I have another problem with my Minecraft PvP map. I'm trying to set up a command block that checks when a player is standing on a block and if so it will give them jump boost so I used this command /testfor @a[x=621,y=80,z=452,r=1] but it says 'The entity UUID provided is in an invalid format' and I don't know what to do. Any ideas?

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That's because you can't use /testfor to find people in exact locations, but what you can do is have a command block below and do a /testfor @a[r=3] and that will check for players in a radius of 3 blocks from that command block.

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    This isn't exactly correct. You can define a box using [x=,y=,z=,dx=,dy=,dz=]. It's just harder to do than specifying a radius, since you need to know the exact coords of where you're testing. – MBraedley Nov 15 '14 at 18:22
  • You can use /testfor to locate a player at a specific coordinate and Joe's command is in the correct syntax to do so. – TheOnlyMrCat Jan 1 '18 at 20:14
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Do you want it to activate more than once? If you don't I recommend hooking it up to a command block that replace the one with /testfor to be replaced by air:

/fill x1 y1 z1 x2 y2 z2 minecraft:air

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