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[dmatter]

It doesn't matter what is above that staircase.  The GCS is pathing downward diagonally to the highlighted square.

Because of the bug in climbing pathing, the GCS can pass downward diagonally into that square from the up/down staircase on the level above it.

In the save you posted, that square is not blocked from the goofy climb pathing.

OOOOoohhhhhh. I was so busy looking at what it could gain access to via climbing up that I stopped looking at what it could gain access to below. You, sir/madam, win an *<<*imaginary cookie roast*>>*. It is adorned with spikes.

[Fallenworldful]

Huh, that's some weird pathing right there. That would explain how all those crundles are getting into my fort.

[dmatter]

Huh, that's some weird pathing right there. That would explain how all those crundles are getting into my fort.

Dwarf bug logic is always !!fun!! (part of the reason I play this game). Though it could be considered a feature instead of a bug since things will path through diagonal spaces on the same Z-level. It only makes sense that the same principle should or could be applied across Z levels for climbers and/or fliers. Though, since a down/up-down staircase doesn't reveal the tiles adjacent to the tile below upon completion I would say it clearly isn't intended.

[Tacomagic]

Huh, that's some weird pathing right there. That would explain how all those crundles are getting into my fort.

Dwarf bug logic is always !!fun!! (part of the reason I play this game). Though it could be considered a feature instead of a bug since things will path through diagonal spaces on the same Z-level. It only makes sense that the same principle should or could be applied across Z levels for climbers and/or fliers. Though, since a down/up-down staircase doesn't reveal the tiles adjacent to the tile below upon completion I would say it clearly isn't intended.

Yeah, it's confirmed as a bug:  #8383

[utunnels]

I always wall off my stair well.
Or you can just add a floor hatch above your stair well as a fail safe.

[Miuramir]

Yeah, it's confirmed as a bug:  #8383

Well, it's been confirmed that the behavior exists; it's less clear if it's a bug or working as intended.  The whole issue of diagonal pathing is somewhat non-physical, and therefore arbitrary.  If a 2D-moving-@ looks at the following spaces:

Code: [Select]

Z:0

123
4@5
678
... and if there is an accessible tile, can move to it;

And a 3D-moving-@ looks at the expanded set:

Code: [Select]

Z:+1  Z:0  Z:-1

abc   123   jkl
def   4@5   mno
ghi   678   pqr
... and if there is an accessible tile, can move to it;

Is that actually a problem, or just the way the game works? 

Personally, if it were my game, I'd have gone the other direction from Toady; he seems to default to "corners are open" in many cases, whereas the more traditional and somewhat more physical view would be "corners are closed".  But the game should be consistent.