How do I testfor a player that crouch wearing a chestplate that is named?

Question

I try to make a sort of ability that implies wearing a special chestplate! When a player wear it and crouch, the ability shoud be activated! I just want to know how can I testfor crouching (the "stat.sneakTime" or "CrouchOneCm" scoreboard doesn't help me)

Answer 1

To tag only those wearing the special chestplate, have these two commands repeating in this order:

/scoreboard players tag @a[tag=SpecialChestplate] remove SpecialChestplate
/scoreboard players tag @a add SpecialChestplate {Inventory:[{Slot:102b,tag:{display:{Name:"Special Chestplate"}}}]}

You should replace tag:{display:{Name:"Special Chestplate"}} with the data you want to identify your chestplate by (e.g: lore, enchantments), I've just used the name "Special Chestplate" for this example.

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To check for who's sneaking, first create a stat.sneakTime objective:

/scoreboard objectives add SneakTime stat.sneakTime

Then, add onto your repeating command blocks in this order:

/say @a[tag=SpecialChestplate,score_SneakTime_min=1]
/scoreboard players set @a[score_SneakTime_min=1] SneakTime 0

The second command will set SneakTime to 0 at the end of the tick, meaning that only players who are currently sneaking will have a SneakTime of 1 for the next tick. If a player stops sneaking, their SneakTime will go to 0.

The /say command is where you should put the blocks for your ability, using the @a[tag=SpecialChestplate,score_SneakTime_min=1] selector.