def update_map
    groups = g.cells.select {|c| c.land? && c.owner }
    .group_by{ |c| [c.group, c.owner] }
    .map {|k,v| [k, v]}

    groups.each do |gr|
      gr[1].each{|c| c.owgrcount = gr[1].length}
    end
  end