# How can I make players share damage using command blocks?

I'm making an adventure map where I want players to share damage - when player 1 takes some amount of damage, player 2 will also get damaged that same amount. I used scoreboards with health, did a scoreboard to test for player's health and I know how to damage using potion effects, but I don't know how to testfor and deal damage to one specific player (the player with higher health).

Could I get some advice on this?

You should use a dummy variable and target selector arguments.

## Run once

Have a dummy score, call it `healthDif`.

``````/scoreboard objectives add healthDif dummy
``````

## Run every tick, in order

Set each players `healthDif` score to their own health score:

``````/execute @a ~ ~ ~ scoreboard players operation @a[c=1] healthDif = @a[c=1] health
``````

Subtract the other player's `healthDif` score from your own:

``````/execute @a ~ ~ ~ scoreboard players operation @a[c=1] healthDif -= @a[rm=0] health
``````

Now players with a positive `healthDif` score will have more health than the other player. Target with @a[score_healthDif=1]
Note this will only work for two players. In order for it to work with more, you have to take a few extra steps.

## Run once

First you'll need a dummy variable to store miscellaneous variables. Call it `vars`. Note: If you already have a variable for this (you likely do), you can skip this step.

``````/scoreboard objectives add vars dummy
``````

## Run every tick, in order

Put these between the two commands from before.

First, set the `#nplayers` to 0:

``````/scoreboard players set #nplayers vars -1
``````

Now, have each player increment `#nplayers`:

``````/execute @a ~ ~ ~ scoreboard players add #nplayers vars 1
``````

Finally, multiply each players `healthDif` score by this number

``````/scoreboard players operation @a healthDif *= #nplayers vars
``````

This way, you can have any amount of players, and the system automatically adapts!

• I'm still kind of unsure how to set this up for the two player one. Sorry I suck lol. – Paulverized Jul 26 '16 at 21:15
• The one fit more players will work for two as well. If using 1.9+, the run every tick should be done with command block chaining. Otherwise, use a fill clock. – rustphoenix Jul 30 '16 at 13:57
• Also, if this answer works for you, please use the "accept" button. – rustphoenix Jul 30 '16 at 13:58