[Endoperez]

Manual, page 76 lists fatique effects, and gives an example with 30 fatigue. Defence would be lowered by 3 (-1 /10 fatique), attack would be lowered by 1 (-1 /20 fatique) and if 2d6oe roll -2 (fatique/15) is lower than 2, a critical hit would be scored. 2d6oe means a simulated roll of 2 six-sided dice, with 6s added to the sum and rolled again. I won't bother to calculate how often the critical hits happen, but it's far less than 30%.