What does "fatigued" mean?

[Anusien]

The rules for Extra Effort include this cost modifier (B354):

If you are fatigued, apply a penalty equal to the missing FP.

"Fatigued" is referenced a few other times in the basic rulebook, but I can't figure out exactly what it means. Does it apply any time you have less than full FP, less than 1/3, or some other threshold?

Other places it's mentioned in the basic rulebook:
* The "Awaken" spell defines "very fatigued" as less than 1/3 of basic FP. (B248)
* Sprinting mentions "somewhat fatigued". (B354)
* Interruptions to Enchanting mention "Fatigued" as "missing 1d FP". (B481)

But notably, the thresholds for missing Fatigue Points (B426) don't name the thresholds.

[Varyon]

I don't think "fatigued" is meant to be a Term of Art here, but rather is just a way of saying "tired." From context, it essentially means "not at full FP." So for Extra Effort, this means if you're missing any FP, you take a penalty equal to the missing amount of FP.

[Plane]

One of the problems I see here is it penalizes people with high FP when applying extra effort - a creature at 95% of their FP at 19/20 is equally at -1 as a creature at 80% of their FP (4/5)

Seems maybe -1 to EE rolls per 10% missing could work better.

[Flowergarden]

Originally Posted by Plane

One of the problems I see here is it penalizes people with high FP when applying extra effort - a creature at 95% of their FP at 19/20 is equally at -1 as a creature at 80% of their FP (4/5)

Seems maybe -1 to EE rolls per 10% missing could work better.

Won't really matter in most of the games. I suppose there's rarely characters with 20 fp or even more, but maybe I'm wrong.
But you can use ER or something.
Hm, maybe fatigue means only fatigue from missed sleep, cold, heat, not sleeping, etc? Penalties is good enough already

[fritzbc]

I agree with Varyon here. Take a penalty equal to lost FP. TBH, having a -10 on a roll to do something (at 5/15 FP) rather than passing out at -10 (0/10 FP) is a bonus, in my book :)

[Varyon]

Originally Posted by Plane

One of the problems I see here is it penalizes people with high FP when applying extra effort - a creature at 95% of their FP at 19/20 is equally at -1 as a creature at 80% of their FP (4/5)

Seems maybe -1 to EE rolls per 10% missing could work better.

A lot of things in GURPS have better resolution if you treat 1 as 10%. It's essentially the High HP and Healing, as well as the High HP and Shock, rules, but applying to both HP and FP as well as not needing a full +10 to see an effect. So anything that restores 1 HP or FP would instead restore 10% of HP or FP, effects (like Shock and the EE penalty, which is kinda an FP version of Shock) that come into play with 1 HP or 1 FP missing would instead call for 10%, etc. You'll have to decide how you want to round for fractions, of course.

[Donny Brook]

Originally Posted by Plane

One of the problems I see here is it penalizes people with high FP when applying extra effort - a creature at 95% of their FP at 19/20 is equally at -1 as a creature at 80% of their FP (4/5)

Good point. It's clearly a very stupid rule.