You're careful plans have paid off, you walk in front of your target with your sword drawn just as your ally places a sword against the small of their back.

"Keep on moving Rashiir, we want to talk", your ally whispers into your target's ear

Rashiir doesn't understand the severity of what's going on, he tries to dodge out of the way and draw his own blade, what do you do?

I attack!

Excellent, roll an extra d20 due to your careful planning, you have advantage!

Wow! A whole extra d20? Or what about in White Wolf rolling an extra 2 d10s? But what about Fudge? Extra dice don't matter because they balance to 0.

What do the dice mean, and why are they so important in a game industry that prides "roleplaying" over "ROLL playing"?

To watch instead of listen

https://youtu.be/QTPOwA7yCcA