Originally Posted by
The_Glyphstone
Actually, Aid Another cheese is very close to what you actually did. You skipped rolling individual checks for the guards (which they were unlikely to succeed on) and rolled one super-check for the entire group (which was much more likely to succeed). For that matter, you misinterpreted statistics - 10 guards each with a 5% chance of success is a little bit higher than 40% chance to get a 20 (40.13% specifically), not 50%.