Skills

Characters in Black Box system can learn to use a varitety of skills, each of them corresponding to the different Main Stats.

Skill Check
To successfully perform a Skill-related action, a throw is made using d100. If, after applying all the modifiers, the result of the throw is less or equal to the Main Stat corresponding to the Skill in question, the action is successful. Otherwise it is considered as failed, but the player can try to make it successful by spending Reserves as per Exertion rules.

Skill checks can also end up having Epic Results.

Unskilled use
The skills are divided into levels of specialization. If character tries to use a skill he doesn't have, his skill check takes a 1/2 penalty to the Main Stat corresponding to the skill in question for each level of specialization he lacks.

Passive use
Acquiring skills can also provide different benefits and abilities. For example, Climber skill removes the usual penalty for acting while Climbing, as well as Fighter skill allows the character to use Active Defence.

Complex skills
Some skills may depend on a few different skills to learn. They are called "complex" skills. The lesser penalty is applied to them in case of the unskilled use.