First, thank you all for the patience and the feedback. It is really appreciated and I am sorry that we are changing the rules, at what feels like a partial game for you. PbP has really long feedback cycles, so I'm trying to plan that in advance to minimize the stress for us all.
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The big difference is whether you want the bell curve or not. d20 removes the curve so that each + or - is a 5% increment; 2d6 has a bell curve to its probability, so each + or - can have a radically different effect on your chances of success. I have to say that the 2d6 is truly burned into my brain at this point, so that is what I am used to and will generally default to.
I like the bell for the skill tests and the d20 for the randomness of combat. SWN was the first Sci fi RPG that I have seen doing it this way. For me it worked perfectly. I have been GMing it for a couple of months now and I am familiar with it by now. It's a really nice way to do it, as they changed the attribute modifier bonus (it's increments are smaller) but used the level (full if you're a warrior, half otherwise) as an extra DM only during those d20 rolls.
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Honestly, now I want to try it. In fact, if I can scrape up some time this weekend, I want to see just how feasible this is. I think I can modify the character generation and person combat quickly and see if it is even remotely workable.
Oooo... Well, Cepheus is one of the candidates for migration. It fits my prerequisites. I don't think the 2d6 and changing the skill list or the attribute range to use theirs is a problem. I am not that attached to the d20, I am more attached to the setting / story. I have read the SRD and think that we can keep our setting with minor changes there, so the heavy lifting of space combat, equipment list, etc that I can't do now would be available.
The real issue is that I never played or GMed it and have very little experience with its rules and balancing. I would be afraid to guide the conversion, but would be able to GM our story afterwards. If you can, please check if there is an easy solution for us to do that conversion. I will wait for your feedback and if you can scrap some time during the weekend before changing anything =)
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I really like the system you've created - trying to get a positive number when subtracting the DC is appealingly novel
Oh, depending on the new rules, that's very easy to keep / put back. It doesn't change the odds, the scaling or balance. I will try to keep it and post how to do that in our forums for the new system. I can already see how to do that in Gamersplane for Cepheus or SWN.
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A changing ruleset is exhausting and stressful for us as players; it's many times worse for the GM that's trying to do that. Whenever you're testing, finish the scenario you've devised for that test, then collate the feedback (and your own notes) and make any necessary adjustments before starting the next test. The other way lies madness. I've been writing RPGs since the mid-80s; I've learned at least a little about playtesting over these last few decades.
Thank you. I feel that choosing those feedback points and the start and end of each test is harder on PbP. When I do some playtesting in real life, a session is a natural place to avoid changing rules. Here, where each session takes months and the game takes year(s), is harder (or even frustrating) to avoid those changes mid-game as the rules feel "wrong". Do you have some advice for me about this? Thanks again, really appreciated.