I'm still confused as to how this is calculated so have been experimenting a bit to see how it functions. The tutorial indicates a jump distance of between 2-5 tiles; ignoring proficiency for athletics for the moment, I take it to mean the following:
03-14 Strength - 2 tiles
15-20 Strength - 3 tiles
Being proficient in athletics I guess would then mean:
03-10 Strength - 2 tiles
11-14 Strength - 3 tiles (With athletics check against DC15; D20 + athletics score to beat)
15-20 Strength - 4 tiles (With athletics check against DC15; D20 + athletics score to beat)
I tested this with two characters in an area near the end of the game with a 3-tile and 4-tile gap.
Ranger has athletics proficiency (but 14 strength).
Wizard without athletics proficiency (but 16 strength).
3 TILE GAP:
Ranger (14 strength) - 3 tiles - successful (with athletics check)
Wizard (16 strength) - 3 tiles - successful (no check required)
4 TILE GAP:
Ranger (19 strength - Gauntlets) - 4 tiles - successful (with athletics check)
Wizard (19 strength - Gauntlets) - 4 tiles - failed, no athletics check does not attempt jump
However I have another character; a druid without athletics proficiency (but 20 strength):
4 TILE GAP:
Druid (20 strength) - 4 tiles - successful (no check required)
Attuning and equipping a 21 strength belt on character B (the wizard) will also allow them to clear the gap. I'm not a D&D pen&paper player, but that seems to be a bit closer to the linked SRD manual in the tutorial section of the game; ie, every point in strength adds an additional foot (well at least how I read it). If each tile is 5-feet wide, 20 strength would cover 4 tiles or 20-feet; assuming it always is rounding down, that would seem to fit.
Unfortunately I can't find any reference to an athletics check unless jumping vertically rather than horizontally; but the game seems to give you a DC15 check to beat with a D20 + your athletics score. In any case 20 strength will give me 4-tile jump distances, without athletics proficiency.
I also thought that the boots of striding would only remove the need for an athletics check, but it's looking like they do give you maximum jumping distance, though I don't have a 5 tile gap to test it. My reasoning is that for Character A (with 14 strength), they normally needs a athletics check to jump a 3-tile gap, but with the boots it makes the 4-tile gap jump without a check, so it isn't simply just adding a single tile of jump distance (otherwise I would expect a check)...so I take the description to mean it will actually maximize your jump distance regardless of your strength; ie the boots seem to have a permanently integrated jump spell in addition to it's other effects.
Though I'm hoping someone here might be able to give an explanation as to whether this is how it works or not, or if there might be some other reason I'm not seeing at the moment.
EDIT (already so many of them!):
I went back to make sure it wasn't just having a untrained passive 5 points in athletics that was increasing the jump distance rather than the 20 strength. Stone of good luck was up to the task:
4 TILE GAP:
Wizard (19 strength - Gauntlets + amulet to boost athletics from 4 to 5) - 4 tiles - failed again
EDIT 2 (after testing the 5-tile gap at the dark castle):
5 TILE GAP:
Druid (20 strength, no athletics proficiency) - 5 tiles - does not attempt
Ranger (21 strength, athletics proficiency) - 5 tiles - successful (with athletics check)
Wizard (25 strength, no athletics proficiency) - 5 tiles - successful (with athletics check)
Fighter (25 strength, athletics proficiency) - 5 tiles - successful (no check needed)
I used belts to increase the strength above their nominal values. What surprised me was that the wizard with their strength aritificially bolstered to 25 ran an athletics check despite being non-proficient, though even then I didn't expect a check to even be required. Also the boots of striding indeed increase distance; my Ranger with 14 strength can make the 5-tile jump with no check needed as long as I'm using those boots.
This post has been deleted.
Steam profile : https://steamcommunity.com/id/baraz/