gistfile1.txt

require 'mechanize'

user = 'xxxx'
pass = 'xxxx'

a = WWW::Mechanize.new
page_post = a.post("http://#{user}.labrute.fr/login", 'pass' => pass)

3.times do
  login = ''
  a.get("http://#{user}.labrute.fr/arene") do |page|
    login = page.search("//div[@class='name']")[0].inner_text
    puts login
  end

  a.get("http://#{user}.labrute.fr/vs/#{login}")
end