Note: The Otus Cover Rulebook is basically the same as the first Complete Rulebook that was limited printing. All of the identified errata (typos) have been fixed, and there have also been several minor adjustments to monsters, bringing them in line with the original, source rules from 1974-1977. The only rule that has been changed is the rule for combat movement. Combat movement is now your movement rate divided by 3, times 10. That's per round, and it's either in feet (for inside/underground) or in yards or meters as chosen (outside). So, for example, a movement rate of 6 is 20ft/round, movement rate of 90 is 30ft/round, and movement rate of 12 is 40ft/round.