In d100 systems such as Chaosium’s Basic Role-Playing (BRP) tabletop roleplaying game rules, I wanted to see what introduce a mechanic called  ‘Advantage’ (taken from d00Lite games like FrontierSpace) which allows a player, when making a skill roll for their character, to swap the digits on the d100 dice, taking the better result. So if a player with a 50% rating on their Weapon (Rifle) skill got a 71 on their roll (a 7 on the tens die and a 1 on the ones die), and if they had an Advantage on that roll, they could swap it and get a 17, changing the roll from a failure to success.

If I use this Advantage mechanic, what is the (1) highest percentage benefit in odds, (2) the lowest benefit in odds, and (3) the average benefit in odds on skills which could be rated from 1% to 100%? I asked ChatGPT to find out, and here are the results! Continue reading