STALKER - The Irish Zone
What the Numbers Mean
Most Abilities, checks, and saving rolls in STALKER – Irish Zone are determined with a d100. That is, 2 10-sided dice rolled together, with one read as the 10s place, and the other as the 1’s place. This unified system can be applied to most rolls in the game. If you’re called to make a Speed check, you roll d100, and compare the result to your Speed Attribute. If the roll is less than or equal to your Speed, than you succeeded. Anything over is a failure. Special circumstances are made for results of 01 or 00 (100), critical success and critical failure respectively. More details on that later.
The benefit of a simple system like this is that it’s easy to apply situational modifiers to the check. Let’s go back to Speed. Imagine your character has a Speed of 40, which is fairly average. If a boulder is falling down a hill towards him, he may be required to make a Speed check or otherwise face the consequences of being in the way of the boulder. However, if your character is drunk, seriously injured, or otherwise impaired, the DM may impose a penalty of -10 or more to your check. So under normal conditions, you may be aiming to roll 40 or below. Under the penalty, however, you’ll need to roll 30 or below.