The rule could be anything, as funny or as serious as you want. The universe will progress in a similar way that it has up until this point, unless your changed rule prevented it from doing so.
Some examples might be:
- The invention of currency is not allowed.
- Iron is slightly less stable.
- The Ancient Greeks are able to cultivate Silphium, which does not go extinct now.
By all means, explain it to me! My best way so far was siting the chase in call of Cthulhu and really it’s not a great example.
Heck yeah, I’ll try my best!
So on a euclidian chess board, moving your king one space left would be 1 space, one space up would be 1 space, and one space diagonally would be √2 spaces (some simple trig gets us there).
Chess however, does not obey the laws of Euclidian geometry nor does its physical representation show us things to scale. A king’s move diagonally is the same amount of space as a move side to side, 1 space.
It’s silly, because spaces weren’t directly supposed to represent distance or anything, but it’s funny that it works out this way
This is a problem I’ve always had with Square grids in D&D and it never occured to me that from character perspective a character is warping space to move slightly further for the same amount of movement.
Also non Euclidian! Hexagons (the bestagons) also tesselate and fix that problem nicely