XyQrTw

Not a duplicate, i think is just a Hit box problem with item in the item frame.

This can be very usefull to know the number of players with the output power of a command block.
And, if we put negative number to cm (for example cm=-10), the command take the C limit without the first 10 (-cm) players.

With command like this /testfor @a[c=10], @a[c=10,cm=-10], /testfor @a[c=10,cm=-20], ...
And a circuit like this :
[C] = Command block ; — RedStone ; [R] = Comparator
[C][R] ----- 10 ----- [C][R] ----- 10 ----- [C][R] ----- 10 -----

The distance of the redstone is the number of players

I searched this "bug" before posting this issue and i had not found. i think i don't looked at because he say "on the ground".

Thanks for your help.