Attacks in combat are not a sure thing. People are moving around, trying really hard not to be hit. Armor deflects blows that otherwise would have done damage. Weapon attacks will often refer to a "chance to hit." The number is the percentage chance, after modifiers, of actually hitting the target. The higher this number, the more likely you will be able to hit. Some examples: 10% chance to hit - You should only be able to hit the target one out of every ten times. 50% chance to hit - You should hit half the time and miss the other half. 95% chance to hit - You should hit 19 out of 20 times, so you will rarely miss. This, by the way, is the maximum chance to hit. Even with super high skills, and all the modifiers, you have a maximum chance of 95% to hit. Your chance to hit is based on the appropriate weapon skill and it is modified by the range, light level, armor, cover your target has, and if the attack is targeted, the specific location you are trying to hit. For ranged weapons, the distance between your character and your target is critical.

The closer your character is to the target, the better the chance to hit. Your Perception is the base factor for how far away a target can be before it gets harder to hit it. If the target is really close, you will even have a positive modifier to your to hit chance. If your target is in the dark, it will be harder to see them accurately. Targets that are hard to see are hard to hit. The light level of the target will modify your chance to hit. The darker it is, the harder it will be to hit them. Armor provides protection by actually deflecting the attack. Attacks that are deflected, or bounce in the case of really heavy armor, do no damage. The negative modifier to a to hit roll is the Armor Class of the armor. Any obstacle between you and your target is considered cover. People, barrels, trees are all cover. You cannot shoot through walls, but it might be possible to shoot through a window. The different locations on the target may be selected. Each location may have a different modifier to the to hit chance, but offers the opportunity to increase the amount of damage done. The modifiers differ from Daylight to Night or in dark areas. The following Chart will give you an idea of the modifiers to be taken in consideration: (Done by Gavin).

Download Probability chart.