Given this discussion, I will have to go back and go through T4 again. I have it in hard copy and digital. I should add that I tend to agree with Marc about task resolution.
Those who express a preference for T4 tasks (or T5, for that matter; the differences aren't that big) seem to be the minority even of those using the editions.
The big issue: The labels were, for Joe N Firsttermer, in field, were not entirely consistent with prior uses.
Assuming extra time, minimum employable skill, and average attribute, standard time/extra time:
Level | 2300 | MT | TNE | T4 | T4.1 | T4.1 sk2 |
Easy | 100% | 100% | 100% | 100% | 100% | 100% |
Routine | 70%/100% | 83.3%/100% | 70%/100% | 72.2%/100% | 25.9%/42.6 | 83.3%/100% |
Difficult | 30%/70% | 27.8%/83.3% | 35%/70% | 42.6%/72.2 | 5.4%/25.9% | 57.4%/83.3% |
Formidable | 0%/30% | 0%/27.8% | 20%/35% | 25.9%/42.6% | 0.7%/5.2% | 1.62%/9.72% |
Staggering | -- | -- | -- | 10%/25.9% | 0.05%/0.7% | 0.18%/1.62% |
Impossible | 0%/0% | 0%/0% | 10%/20% | 5.4%/25.9 | <0.01%/0.05% | 0.01%/0.18% |
Attribute/DM | 10/+2 | 7/+1 | 6/na | | | |
Skill | 1 | 1 | 1 | 2 | | |
[tc=3]7[/tc]
[tc=2]1 [/tc]
2300: 1d10+mods for 3+/7+/11+/15+/na/19+
MT: 2d6+mods for 3+/7+/11+/15+/na/19+
T4: (1.5d)/2d/2.5d/3d/3.5d/4d
T4.1 (1.5d)/2d/2.5d/3d/4d/5d; if skill not 1+/2+/2+/3+/4+/5+, then rolls are 2.5d/3d/4d/5d/6d/7d and extra time makes that 2d/2.5d/3d/4d/5d/6d. Technically, the ref isn't obliged to allow 6d and 7d rolls...
The spoiler contains the anydice script
The numbers for T4 stock aren't too different, but the half dice annoyed many. The numbers for T4.1 are brutally harder... but are much mitigated if you raise employable skill to 2... it makes things better... but raising atts to 12+ makes HUGE differences. I'm not going to calculate it tonight.... but due to the WIDE bells... T4.1 meanings for higher than difficult were really pretty insanely low with average stat... but still allow doing impoissible.
(I figured out long ago that the task labels in 2300 and MT are a good fit IF the basis is average att skill 1 ... they really cannot get an impossible, even with extra time.)