Mine

on *:text:!dm*:#:  {
  if (%dm.2 == active) {
    notice $nick a dm is already active, please wait for it to end.
  }
  {
    if ($nick == %dm.play1) {
      notice $nick You Can't Vs Yourself! :P
    }
  }
  else {
    if (%dm == active) {
      set %dm.play2 $nick
      msg $chan The Match Is Set! %dm.play1 vs %dm.play2 $+ .
      set %dm.2 active
      set %dmhp1 99
      set %dmhp2 99
      set %dmspec1 0
      set %dmspec2 0
      set %dmturn 1
    }
  }
  Else { 
    set %dm active
    set %dm.play1 $nick
    msg $chan $nick Has Initiated A DM! type !dm To Fight Him.
  }
}