User-agent: *
Disallow: /showthread.php
Disallow: /showpost.php

User-agent: sistrix 
Disallow: /

User-agent: Exabot
Disallow: /

User-agent: BacklinkCrawler 
Disallow: /

User-agent: Nutch
Disallow: /

User-agent: Domain Re-Animator Bot
Disallow: /