[RyDeR`]

You forgot the case:

pawn Код:

if(!strcmp(pname, "Blacklisted_Bboy", true, sizeof(pname)))
{
    format(string, sizeof(string), "[OWNER]%s:%s", pname, text);
    SendClientMessageToAll(-1, string);
}

I set to true, change if you want it different.

EDIT: LeNy was faster.