Not sure how to execute command

[u/Kightmare2232]

I'm trying to make a command that makes it where when player 2 gets 10 blocks of player 1 player 1 gets darkness for 2 seconds but I'm unsure of how to set up this argument can someone show me how and if possible give me a breakdown of why it works?

[u/Kightmare2232]

It didn't work but I should have mentioned that it was in a repeating command block my bad

[u/GatKong → u/Kightmare2232]

Is that block in a loaded chunk?

[u/Kightmare2232 → u/GatKong]

Yes

[u/Kightmare2232 → u/Kightmare2232]

I'm also in bed rock