Pit Rarities

[PowerDiver]

Is there a reason dragon pits are so rare in comparison to undead pits? I would think there should be a more or less even balance between dragons and demons and undead.

Looking a bit, there are 7 kinds of dragon pits with rarity 6, so that makes the total comparison is just a bit more commone than rarity 1 IIUC.

The standard undead pit has rarity 1. However, the undead pit average depth 80 while the dragon pits are average depth 85, which surely makes undead pits more common.

Furthermore, there are lesser undead pits and vampire pits at much lower levels, each with rarity 1. Demons come in somewhere in the middle due to lesser demon pits.

Aside: While I was looking around, I noticed that the pits and nests declarations were each present 4 times in dungeon_profile.txt. Is that really intentional?

[edit] Should have noted playing version Angband-4.2.5-338-gdec118a25

[Nick]

The way dungeon_profile.txt works each generation type needs to include all the room types that appear, so there is a lot of repetition (classic, modified, moria and lair levels all have pits and nests, so that's where the four comes from).

Your calculations on rarity look reasonable to me, so there may be something subtle going on, perhaps with the fact that the undead ones are actually nests (so unordered), and maybe to do with the relative total number of pits and nests in pit.txt.

[PowerDiver]

Currently at DL78, and I have lost track of the number of undead pits/nests but seemed like at least a dozen, and have not seen a dragon pit all game. If I play another game, I'll change their depths to 70 or 75 and see if it makes a difference.

[backwardsEric]

With the debugging commands in 4.2.5-454-ged7ed82ac:

disconnection stats (ctrl-a D) with 5000 simulations of level 78; look at generation statistics in disconnect_gstat.txt in the user directory: 2113 classic levels, 2360 modified levels, 25 lair levels
for the classic levels, average of .1278 pits / level and .1174 nests / level
for the modified levels, average of .2102 pits / level and .1534 nests /level
for the lair levels, average of .0800 pits / level and 0 nests / level
768 total pits and 610 nests in the 5000 simulations

pit stats (ctrl-a P) with 5000 simulated pits
1706 dragon (256 acid, 241 electric, 240 fire, 267 ice, 247 poison, 256 multi-hued, 199 gold)
91 demons
0 undead
0 minor demons
0 lesser undead
194 vampires

pit stats with 5000 simulated nests
0 dragon
0 demons
4059 undead
0 minor demons
24 lesser undead
0 vampires

Combining those, would expect that the 5000 simulated levels had 495 undead nests, 2 lesser undead nests, and 30 vampire pits compared to 262 dragon pits.

[PowerDiver]

With the debugging commands in 4.2.5-454-ged7ed82ac:

disconnection stats (ctrl-a D) with 5000 simulations of level 78; look at generation statistics in disconnect_gstat.txt in the user directory: 2113 classic levels, 2360 modified levels, 25 lair levels

Thanks for doing this and pointing out the commands.

That's not really what I was getting at. I'm more interested in levels 40-75 cumulatively than 78 specifically. Figuring out debugging commands seems too much like work to me today, but perhaps I will feel more energetic in the future. Perhaps I will just want to add some sort of lesser dragon pits.