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I have a "queued" tag which uses the new 1.9 feature to tag a player as part of a list. I want to have a command line that only runs if no more players in the world have the "queued" tag.

Something like a command block with

/testfor @a[tag=queued]

inside and a redstone torch attached to the side would work, but it's not practical in this case because of the redstone delay--I need some sort of command that can do this logic instantly.

try testfor @a[tag=!queued]

Quote from Minh2908»

try testfor @a[tag=!queued]

The issue is that this command block will output true if any player isn't in the queue. I need a command block which outputs true only if ALL players aren't in the queue

First do this in the a area that is always loaded (on top of command blocs):

/summon ArmorStand ~ ~ ~ {Invisible:1b,NoGravity:1b,CustomName:"GameCore"}

Then run this on a clock in this order:

1:/scoreboard players tag @e[type=ArmorStand,name=GameCore,tag=!NoQueued] add NoQueued

2:/execute @a[c=1,tag=queued] ~ ~ ~ /scoreboard players tag @e[type=ArmorStand,name=GameCore] remove NoQueued

I just told him how to do it, it is completely possible with commands.