When you say "that is unbelievable control", you seem to be assuming the exact outcome with trick dice would be exactly and entirely predetermined. But there's no reason to think that. The trick dice would only have to make winning much more likely to pull your "impossible" odds down into the realm of the possible. What you describe as a die that "occasionally rolled every number except a 1" is what you would expect to see if the "1" side were weighted a bit - it would often roll a 6, sometimes roll a number adjacent to 6, and never roll 1. Contrariwise, it's possible that the three dice facing it could have been rigged to do poorly. If a die with the "1" side weighted faced three dice with the 6 side weighted, that could do the trick.
Some amount of dice rigging could make your loss expected or reasonably likely but not guaranteed. And yes, it's unlikely your friend would (a) weight your dice, (b) waste this ability on a meaningless game of risk, and (c) keep up the act all these years, but it's not 1-in-100-billion unlikely. People playing little tricks or experimenting on their friends is something that does happen in the world as we know it, therefore it could have happened to you.
Though I like Jack's explanation too.
"...it would often roll a 6, sometimes roll a number adjacent to 6..."
Assuming standard probability applied to my three dice, the odds of my rolling at least one 6 are 1 - (5/6)^3 or approximately 0.4. Assume that the "trick" die rolls a 6 half the time. (Remember I was watching as my opponent also rolled 5's, 4's, and 3's.) Then the probability that I would win a battle is at least 0.4 x 0.5 = 0.2. The attacker odds are actually higher since the attacker would usually win if the defender rolls anything but a 6. My estimate is that wit...
What do you believe that most people on this site don't?
I'm especially looking for things that you wouldn't even mention if someone wasn't explicitly asking for them. Stuff you're not even comfortable writing under your own name. Making a one-shot account here is very easy, go ahead and do that if you don't want to tarnish your image.
I think a big problem with a "community" dedicated to being less wrong is that it will make people more concerned about APPEARING less wrong. The biggest part of my intellectual journey so far has been the acquisition of new and startling knowledge, and that knowledge doesn't seem likely to turn up here in the conditions that currently exist.
So please, tell me the crazy things you're otherwise afraid to say. I want to know them, because they might be true.