House rules for skills

[Rule of Three]

Ive try a very simple system for skill : you have to choose a profession at level 1.

When you use a skill related to your profession, you can keep the best roll of 2d20.

So :

A level 5 rogue (which is a professional thief) roll 2d20+5 when he try to climb a wall.

A level 5 rogue (which is a professional a swindler, not a thief) roll 1d20+5 when he try to climb a wall.

A level 5 fighter (which is a thief) roll 2d20 when he try to climb a wall.

At low level, the 2d20 bonus is better than +level bonus for low difficullty roll. Meanwhile, a class member is always better at difficult tasks.

Any thought ?

PS : I'm not a native speaker but don't hesitate to display my grammatical errors.

[mordrene]

do you have a list of skills for each profession?

[Treebore]

So your basically saying if its "profession" related they get to roll 2d20 + level, and keep the best d20 roll?

Then if it is just a class skill they get to roll 1d20+level?

Then if it is a class skill, but done by a class with a "profession" that allows it they get to roll 2d20, but don't add level, and keep the best of the two rolls?

Well, if I get it, I think it would work out in the long run. I don't know if I like it better than what I do, though.
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[Rule of Three]

mordrene wrote:
do you have a list of skills for each profession?

No, I don't : I want to keep the simplicity of C&C.

I decide on the roll, as for the level bonus anyway.

Roll for attributes, chosse a class and a profession.

End of the technical creaction.

That the reason I come "back" to C&C after dd3.

So, no skill list for me.

But ... do as you want.

[Rule of Three]

Treebore wrote:
So your basically saying if its "profession" related they get to roll 2d20 + level, and keep the best d20 roll?

Yes and no : Give 2d20+level if you think that the skill is related to profession/occupation AND class.

Treebore wrote:
Then if it is just a class skill they get to roll 1d20+level?

Yes. It's just a normal SIEGE roll.

Treebore wrote:
Then if it is a class skill, but done by a class with a "profession" that allows it they get to roll 2d20, but don't add level, and keep the best of the two rolls?

If the skill the player want to do is related to his profession but not is class, he can roll 2d20 (and he don't get the level bonus)

So :

CLASS SKILL : SIEGE ROLL : 1d20 + level

PROFESSIONAL SKILL : 2d20

CLASS AND PROFESSIONAL SKILL : 2d20+level.

Basicaly, the players have to choose between :

- to be a specialist : the class and profession are typicaly associated (rogue and thief, fighter and mercenary, ranger and hunter)...

- to have two different fields of expertise (but only the class part will become "heroic" indeed). For exemple : a fighter can be a scholar, a mage can be a merchant...

You could say me : If you want to be a scholar fighter choose INT as a prime. A simplier than your system. And you will be right !

It's just a second layer : you have to choose 3 things to create tour caracter.

With my system, you can be a scholar fighter with INT prime and be just a little different from another INT prime fighter.

Thanks for your answers.

But, but ... You are the Mythical Treebore !
The Man with 6000+ posts respond to me (with 1).

That's what I love with this forum : It's very open.

Treebore wrote:
Well, if I get it, I think it would work out in the long run. I don't know if I like it better than what I do, though.

The beauty of C&C !

[adaen]

For those who are interested, I took the trouble to compare the probabilities of the hi(2d20) [take the hi result of 2 d20 rolls) vs a std. d20 roll. The first column is the % Prob of the hi(2d20), the third column is the standard d20 %Prob, and the second is the result that corresponds to both.

P hi(2d20) P% (D20)

0.25 1 5

0.75 2 5

1.25 3 5

1.75 4 5

2.25 5 5

2.75 6 5

3.25 7 5

3.75 8 5

4.25 9 5

4.75 10 5

5.25 11 5

5.75 12 5

6.25 13 5

6.75 14 5

7.25 15 5

7.75 16 5

8.25 17 5

8.75 18 5

9.25 19 5

9.75 20 5

Also telling is the average and std. deviation of these distributions:

13.825 avg 10.5

4.716990566 sd 5.916079783

These sorts of discussions are always of interest to me since I use the TriDie system of my own devising for my own designs (as well as for C&C).

Best,

~AoB
_________________
~Adaen of Bridgewater, www.highadventuregames.com

[rabindranath72]

For the uniform d20 roll the average does not have any probabilistic relevance, since the distribution is flat. Whereas for the max(d20,d20) method it is somewhat more relevant, but not much, since the distribution is completely skewed

[adaen]

rabindranath72 wrote:
For the uniform d20 roll the average does not have any probabilistic relevance, since the distribution is flat. Whereas for the max(d20,d20) method it is somewhat more relevant, but not much, since the distribution is completely skewed

I'm not sure of your meaning here. I agree with most of the things you say:

regular d20 is flat and the max(d20, d20) is indeed skewed, but I'm missing your point regarding the relevance of the average and sd. The averages are directly comparable, as is the predictability of the distribution (the SD). This gives a lot of information as to how the two types of rolls will impact the game. Am I missing your point?
_________________
~Adaen of Bridgewater, www.highadventuregames.com

[Birthright]

I think Rab's point is that since each of the outcomes on 1d20 is equally probable, the 'average' does not help at all in determining the outcome in a probabilistic sense.

For the best of 2d20 roll, the distribution of outcomes is highly skewed to the high end. The average - standard deviation method is usually applied to normally distributed (i.e 'unskewed') distributions and loses its significance in determining probability when skewness is introduced.

At least that's my reading of things - Rab is the real mathematician in these parts.

I think a more useful analysis is looking at cumulative frequency. A quick look at your stats shows max(d20,d20) results in nearly a 37% chance of getting 17+, whereas 1d20 has only a 20% chance of the same range.