Mano a Mano:Success Rolls

Success Rolls Rolls and Modifiers

Some actions are always successful and some are never successful, but many actions have a random chance of success. When rolling for the success of an action, roll a twenty-sided die and add success modifiers to the result. If the total is greater than the difficulty of the action plus difficulty modifiers, then the action is successful. The action is also automatically successful if the die roll is 20 before adding success modifiers.

Difficulty

The difficulty of an action is a modifier added to the roll against the action's success.

difficulty	description
5	Anyone will usually succeed
10	Experts usually succeed
15	Difficult even for experts
20	Nearly impossible without training
25	Nearly impossible even for experts

Environment and hastiness can effect the difficulty of an action. Add 2 to the difficulty modifiers for unfavorable circumstances. Add 4 to the difficulty modifiers for hostile conditions. Modifiers for unfavorable circumstances and hostile conditions are not added to other modifiers for unfavorable circumstances or hostile conditions. When more than one of these modifiers apply, use the modifier which increases the difficulty the most. If multiple unfavorable circumstances compound each other, treat the combination as hostile conditions by adding 4 to the difficulty instead of 2.

Favorable Circumstances

Add 2 to the success modifiers for favorable circumstances, or add 4 to the success modifiers for very favorable circumstances. Modifiers for favorable or very favorable circumstances are not added to other modifiers for favorable or very favorable circumstances. When more than one of these modifiers apply, use the best one. If a combination of favorable circumstances is much better than the individual circumstances, treat the combination as a single very favorable circumstance by adding 4 to the success modifiers instead of 2.